If you have read introducing yourself then you will understand ,if not have a look. Anyway we had this gs, tried to sell it and best offer we had was £80 from the local bike breaker. S,.o went what the hell as we cant afford to buy or make a 9sec bike we wil run in the Super Twin ET class at Shakespere County Raceway with a budget build.Striped the gs down to a frame and Dans plan was to run a longer swing arm,wider back wheel ect. Prob was the R6 wheel he got put the chain through the frame and he didn't want a welded stock swinging arm .Out with the tape and worked out it would be better to back halve the frame . Drilled through to the engine mounting tubes and found 1inch tubing fitted down the middle so made rear wheel adjuster boxes . The jig is a bit of old kitchen worktop with blocks screwed to hold frame and wheels. All worked from centre datum line. Tube was fish mouthed with 1inch hole saw and temp MIGed as waiting for a new reg for my TIG .Forks shortened 4inches and tube remachined to take plugs,handy having a tame machine shop nearby,looks as original. Frame head laid back to 18deg and this give us 3inches ground clearance.pics to follow .
I'm really having trouble understanding what this post says.
So you built a drag bike out of a GS500? Can you please edit this post so it makes a bit more sense.
Run on sentences can really confuse someone trying to read this..
but I guess pics would help quite a bit.
(http://s881.photobucket.com/user/twobugs/media/009_zpsbd208647.jpg.html?sort=3&o=0)
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I agree, I'm totally missing the point here.
Dan, please clean up your post. Use a bit more punctuation and break up sentences that are separate thoughts.
If English isn't your first language, I'm sure someone here will help you sort out the grammar.
Otherwise, looks like you are in for an extensive and expensive (but hopefully fun) project!
I knew what he said! :p. .... I use lots of. ..... in my extended posts for separate thoughts..... and
Sometimes even a line break! ... but there is a limit on edit.time with the forum!
I understood most of that haha.
That's an interesting project.I cant imagine a GS500 would be very exciting to dragrace but the building part of it looks cool :-)
it was late and we had a family tea ----and some alcohol!!!!! Its dans dad doing the post and the build . Thought I had done ok as born before tech was invented, ha ho. As to a GS not being a good drag bike ,well its a dial your own ET class so consistency is king and the stock GS was--- so won races.We are hoping to run high 13s due to the lack of weight . The new frame section is lighter than the swinging arm and no damper and spring .
He he, its one of those races where you can sand bag your way to the top eh. Fun.
But ... well ... the GS wont wheelie, so you can run a stock GS in that category, so why bother ?
Cool.
Buddha.
Ahhh c'mon Buddha! ... half the fun of draggin' a custom job is building it! .. and changing/tweaking this and that. ...
Plus dial your own ET is very competitive! ... sure the gs pretty much won't power wheelie but a slight lift up of wheel can upset things and then cost tenths/hundredths/thousandths on the time AND THEN ruin your whole event!
You hack on Bonneville mod bikes too Buddha?!? :p lol
Servus,
not bad the conversion. :cheers: :cheers:
What do you use for a motor? Give me more info about it, thank you.
Dans painted the front rim in Ford Focus ST Orange, need some more to do back rim but shop out of stock. Fitted the steering damper after first making a new lock stop ,clip ons hitting frame !!!! Got the TIG working , need battery for my good mask that I have new lenses for. Need all the help I can get to see clearly now. Pics to follow ,not able to get camera today as in bedroom and the missis was sleeping after working nights.
did some more welding,made up the bodywork so Dan can sit on . tyres fitted and today he went and put them in the frame so tomorrow (sunday) we can work out where the pegs will fit. the tank will need sectioning as the seat is a bit tight ,OK in track bottoms but not enough room for leathers. See how it goes tomorrow--------
chopped the side case to make out rigger for sprocket,rear brake cyl and lever fitted .(http://[[url=http://s881.photobucket.com/user/twobugs/media/002_zpsmhvd0cym.jpg.html%5D%5BIMG%5Dhttp://i881.photobucket.com/albums/ac11/twobugs/002_zpsmhvd0cym.jpg)[/URL]/img][imgURL=http://s881.photobucket.com/user/twobugs/media/003_zpswcasdupu.jpg.html]http://(http://i881.photobucket.com/albums/ac11/twobugs/003_zpswcasdupu.jpg)[/URL]][/(http://[[url=http://s881.photobucket.com/user/twobugs/media/002_zpsmhvd0cym.jpg.html%5D%5BIMG%5Dhttp://i881.photobucket.com/albums/ac11/twobugs/002_zpsmhvd0cym.jpg)[/URL]img(http://i881.photobucket.com/albums/ac11/twobugs/002_zpsmhvd0cym.jpg) (http://s881.photobucket.com/user/twobugs/media/002_zpsmhvd0cym.jpg.html)][/img]
random day off today ,managed to escape and go to local bike breaker/repair shop. He has a 500 that the engine was sold to go in a go kart . Got the rear brake set to mod as a gear shift and a bolt to replace the threaded bar in front engine mounting. Went to the machine shop to ask if he could make a shaft to outrigger the gearbox sprocket,now have to do a technical drawing for him to follow,bum forgot to ask if he can make splines . will need to bore centre of doner shaft and weld it to new shaft, it was welded to the main gear shaft that I cut it from (a triple of some make as couldn't see any cast name in case)so hope it holds ok.
got some more done,the out rigger sprocket shaft machined and bearing carrier made. Trouble is the bloke from the local bike yard has gone into Hospital for emergency back op. he was going to weld up the modified side case so that's holding things up. Redone the rear brake cylinder mounting as it looked messy , worked out the mounting for fuel tank and battery box, just need sheet ali to make it. Off the shelf chain from bike breakers is 1 link short so hope he has a longer one (121 LINKS) .Welded on the mountings for the billet pegs , need to mod gear pedal as its to far from foot. Cant work on it for next 2 week ends as prepping and racing the drag beetle ,must be spring :woohoo: Will be picking up Dans leathers from one of the other racers.One of the next things to make is the mountings for chain roller(anti slap!!) Made the rear caliper reaction bar using the ends of the GS one and the bracket from the rear arm , looks stock with the original bolts, I was well chuffed.Piccys to follow when I get time.
I like this project, please update again! I think this is one of the more original things Ive seen done with the gs in a long while. Good luck mate!
Had a weeks hols ,spent Sunday to Thursday working on the bike, off today till Sunday being crew chief ,tow truck, pusher for my daughters drag beetle. Picked up the side case now its finished welding, all the bits for the air shift (cost £101 !!!!!) and new exhaust pipes bent up. Side case fully fitted with out rigger for front sprocket and the rear bolts to the frame so hope its strong enough thrust wise as it just sits on the splines . gear linkage made and air ram fitted, just need to set lever to riders foot. Braided brake lines made, both 6" shorter than stock. Wiring loom made up from old GS one, replaced terminals in original blocks and shortened as needed. Used original style bullet connectors, bought correct crimping tool so it looks factory. Needed 3 relays to work air shift/lanyard switch , recon it took me 6hours to do electrics and still have coil terminals and air ram sensor to do. Quick action throttle and cable, rear (Thundercat r6) wheel bearings still to get. Frame can be striped down now for finish welding as some brackets are only tacked due to access . then engine work starts , decked to raise squish to 40 thou and head skim to raise compression to 10.5 or 11 to 1. Want to fit 38mm carbs but bike breakers don't wont to split a set of 4 so will run stock for time being . Then we have the body to make in glass fibre !!!!! and all ready for 2nd week end in July.Need another weeks hols--------
I like the idea of the dragster! :woohoo:
BUT, i don't trust the welds and the structure.... even at 5 Mph :o
I'm sorry to say, but i have to warn you.
Quote from: dB-tje on June 05, 2015, 02:34:17 AM
I like the idea of the dragster! :woohoo:
BUT, i don't trust the welds and the structure.... even at 5 Mph :o
I'm sorry to say, but i have to warn you.
Have you ever looked close at the factory welds on the gs?
Quote from: W201028 on June 05, 2015, 02:49:29 PM
Quote from: dB-tje on June 05, 2015, 02:34:17 AM
I like the idea of the dragster! :woohoo:
BUT, i don't trust the welds and the structure.... even at 5 Mph :o
I'm sorry to say, but i have to warn you.
Have you ever looked close at the factory welds on the gs?
It's not only the welds, i think the combination of welds, the angle of the front fork and breakin at hi speed will tear the frame in peaces.
from the original frame back its a standard style drag bike frame,it would take 150plus ponies not the 55(if we are lucky) from the gs engine. It will run on a smooth drag strip so no bump or pot holes and no twisting corner loads. If it was a road bike then yes it would be built different.If it was a full new tube frame then the top (as in the bit of gs frame that's left)tubes would be 1inch and also the bottom bars .So we are happy with it having looked at lots of frames at the track, also its far stronger than a stock gs frame!!!!!!!!
frames painted,forks and wheels back in. Sorted more bits out and back brake working, front wont bleed , think piston sticking in m/cyl so may have to strip it. Waiting for gasket set to work out deck height , local bike bloke thinks its 40 thou so if that correct and we get the head skimmed 40thou that should give 11-1 compression. that will make her bark. Will be doing body work to finish the buck to make the mould for the glass shell .MUST remember to take the camera!!!!!!
Managed to do 1.5 hrs work every night this week, bits painted, polished and fettled. made rev counter mounting ,picked up handle bar mountings from breakers on the way home from work and used them to mount the bracket . Sorting the air shift pipes , tank and valves tonight and I will take the camera .
Great, cant wait to see some new pictures! Also cant wait to see times with an airshift!
Got the head back today,barrels tomorrow. Heads skimmed 43 thou and 10thou of the barrels .Need to radius the edge by the exhaust valve so will lose a bit of compression but hope it will make up for it in better flow. As to the air shift I fitted the new battery and checked the relays ect but the air valve didn't work,not had time to find out whats up yet. Spent all afternoon filling and rubbing down the buck and its nearly done ready to take a mould from.Running out of time to get it ready for the 19th as still have to dry build head to check piston clearance to valves, mod ign timing, make exhausts , finish gear linkage and make body work . Only have 2 sundays a random day of and 2 hours at night .
update got some Honda cb1000 carbs for £20 ,38mm so made some manifolds tonight using the flange from the gs carbs drilled out with a hole saw and then welding some bends on using off cuts of exhaust pipe. Just happened to have 2 bits of the correct diameter and bend in my usefull bits bin (never throw stuff out if you have the space!!!!) Now have to open the intake runners out to 38mm and blend them in. shame we cant get GR650 pistons and sporty cams easy in the UK .
the mould is coming on ,three layers of paper and pva tonight ,same tomorrow should make it strong enough we hope. pics. soon when I have time
This is a pretty ambitious project. :bowdown:
Wont you need to degree your cams to make any real horsepower with all that head shaving?
yes but that's a winter job. Anyway engine built and fitted, Honda carbs modified and exhausts made, starter solenoid wont work so temp fitted a 70amp relay. Put some fuel in and it LIVES and once idle was set runs sweet. Carbs don't seem to far out but it will be set on a rolling road but that's a winter job as well. Gear shift to set tomorrow night, wheel and fork alignment . Have the day off Wednesday so making the throttle cable and then the glass fibre shell that needs to be fitted Thursday night so might be ready for Sunday.
Quote from: dB-tje on June 05, 2015, 02:34:17 AM
I like the idea of the dragster! :woohoo:
BUT, i don't trust the welds and the structure.... even at 5 Mph :o
I'm sorry to say, but i have to warn you.
I agree fully :thumb:
(http://i881.photobucket.com/albums/ac11/twobugs/005_zps4f96e7b4.jpg)
I will be amazed if it makes it through scrutineering with welds like that.
Quote from: dan the man on July 12, 2015, 12:53:41 PM
yes but that's a winter job. Anyway engine built and fitted, Honda carbs modified and exhausts made, starter solenoid wont work so temp fitted a 70amp relay. Put some fuel in and it LIVES and once idle was set runs sweet. Carbs don't seem to far out but it will be set on a rolling road but that's a winter job as well. Gear shift to set tomorrow night, wheel and fork alignment . Have the day off Wednesday so making the throttle cable and then the glass fibre shell that needs to be fitted Thursday night so might be ready for Sunday.
Those welds were scary - looking at the rest of the frame it is possible that they were ground down after those pics :icon_eek:
I really hope it did not break...
Not made it for Sunday as the LH carb wont work, blocked idle passage according to the local bike breaker/repairer as the CV carb wont send fuel to the main jet if the idle is blocked. Cleaned it 3 times so must be corrosion. On the look out for some 38mm Mikuni round sliders (cant afford flats!!!) We know its lack of fuel as its not getting hot on that side but spray a light mist of brake cleaner in in carb and it picks up and gets hot.
As to the welding debate its not as bad as it looks in pics, the wire speed was playing up and its now fixed . The weld have been ground out and redone when I get time to post pics you will see my neat welding. Next track day is the 2nd August so more late nights then----------------
Awesome!! :thumb:
Sooooo took the R1 instead so he could do his licenced runs, had to make a chain guard from a ali food pot from one of the other racers and then the battery died so borrowed some ones spare . Any way he did a 12 .6 @ 118 as a first easy pass , 2nd run tried a bit harder of the start but she wheeled so shut throttle and then opened up again ,wheeled and smashed him in the nuts. still ran a 11.6 !!!! . 3rd pass a near perfect launch just showing air in first gear and did his best of 11.2 @135 .wants to run a 10 next.
Back to the GS , tried to get that carb to go last night but no joy. Its not getting a vacumn signal to pull fuel and raise the dashpot so think its defo got a blocked internal drilling. Will try again.
Nice times! :thumb:
SORTED!!!!!! cleaned carb again , think some of the transfer holes were blocked as in the ones that are by the butterfly and are minute. Hurt my ears at 8k revs and sounds strong. Need to fit the bodywork next but cant find the dzus fastner recepticals (plates with the spring bit already fitted) ,wasted 2hrs looking. have some slide on ones but no pins unless I rob some of the R1.
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don't you just love photobucket, all the new photos went on my album randomly and some wont post. Anyway port shots are ment to be before and after , may try some again as the exhaust shots look good . Off for a shower now as its Hot Rod club night.
spent this morning making a degree wheel and slotting the bolt holes in the cam sprockets. thought it might be hard to slot the holes but the 6mm parallel tungsten tip in my die grinder made short work of it.Had to trim the lock tabs as they hit the plastic anti rattle pads on the sprocket. Now just need to refit cams and set timing when Dan can give a hand. The next weekend we are off drag racing the beetle so might be a while before its done. Rolling road next!!!!!
How did you lower the front forks, just cut the springs?
I hope the cams are balanced or that head ain't gonna last too many runs i wouldn't think.
Those welds dont look very safe. What speeds are you hoping to do with this beast?
That is one scary looking ride, i wouldn't ride it and i'm crazy stupid. I hope all goes well.
John
forks shortened 4" and threads recut in top(by machine shop)then spacer tube shortened as well.As to the welds AGAIN they look bad as the wire speed was playing up but they have good penetration, I know because I blew a few holes .
as to et and speed we hope for low 14s or better just over 100mph.
Our Dan will be riding (my youngest) we put a Honda 350 twin in his old junior frame (that I built) and that went 14.2 and was much the same size but with a chrome moly frame 1/14" dia so not as stiff as this one. This is the 4th bike I have built for him from scratch,first when he was 10 and now he's 25.
Cool, i was worried that the fork springs had just been cut and lowered. You obviously know what you are doing.
I'm extremely interested it the porting job you did. Did you just clean up the inlets or did you remove quite a bit of metal? It's hard to tell from the pics. Did you polish the exhaust ports? I already have the fastest gs in melbourne (well i think it is, no one else can keep up with me) but i still want it quicker. Can you provide some more info on the port job?
The bike does look great by the way, if not scary.
we are using 38mm carbs,maybe a bit big but they were £20 for set of 4 .This is a budget build,anyway had to make inlet manifolds to match so ports are opened up to 38 and then flowed into valve and yes that's a lot of material removed. the exhausts are done much the same as the pipe is the same id as the old pipes od and then blended . I used the same method as our beetle heads ,polish the bottom of the port and open the top blending the valve guide boss . This effectivly raises the port . Now you must remember this is for drag racing so its set for wide open throttle , with the air shift you don't lift for gear changes so part throttle response isn't important ie loss of low end torque . Bigger cams would work well but budget wont stretch as well as a bigger bore. AS for scary its just a "normal" drag setup and will be at home with the rest of the tube framed bikes,we will be happy if it make 50+hp
That thing looks pretty awesome. Do you have any videos/audio of it?
It took me days to post the pics so we will see if Dan can get video off his phone (would be nice).
Hold up in testing as Dan has a First Responder course over both the next 2 test and tune week ends so that only leaves the last (Halloween) meet to check it out.
well its been a long winter , the bike never got to the track as Dan was doing a First Responder course(first on scene before Paramedic/ambulance) and the training weekends clashed with the race dates. So today reset the intake cam timing (woops it was a tooth out) but then the battery was completely flat due to the ign switch getting knocked on under the cover. Only had an hour so not enough time , have a day off this week so will be fixed then.
When you hoping to take it to a track now?
dans taking his full bike test in April so when he passes he wont need a race licence to run wot you brung. He has an R1 that he has taken down the strip,11.2 @135 so the gs will be slower but more fun as it should launch ,R1 just wheelies like a Buddha Loves You!!!!!! Should be the middle of May , need to make a bike trailer as well.
totally not for me but fair play man :thumb: its different and you've certainly put some work in, kudos 8) O0