I believe some bikes like the GS where restricted, for reasons of insurance or licenses...
They where not to exceed 30BHP or something, to fall into a smaller category of bikes, if I'm not mistaken.

I'm not running too lean. I did raise the needle by 3mm before, but it was running rich (exhaust smelled like gasoline, and became black over time), so I removed the washer, and now raised it by 1.5mm instead of 3, and it seems to work just perfectly.
Top speed now is 85-87MPH, so about a 4mph increase from before.

Before I felt indeed it was starving, especially around 4-6k RPM.
Now it revs really smooth all across the rev range, and MPG is around 52MPG (with 1/2 of the time riding above 80MPH, and 1/4th of the time stuck in traffic). Not so bad, I'd say; though I wished for better.

The Yamaha R3, or the Honda CB300F look like nice replacement bikes, with better fuel efficiency!

 

Quote from: MeeLee on May 05, 2015, 03:31:29 PM
I believe some bikes like the GS where restricted, for reasons of insurance or licenses...
They where not to exceed 30BHP or something, to fall into a smaller category of bikes, if I'm not mistaken.

I'm not running too lean. I did raise the needle by 3mm before, but it was running rich (exhaust smelled like gasoline, and became black over time), so I removed the washer, and now raised it by 1.5mm instead of 3, and it seems to work just perfectly.
Top speed now is 85-87MPH, so about a 4mph increase from before.

Before I felt indeed it was starving, especially around 4-6k RPM.
Now it revs really smooth all across the rev range, and MPG is around 52MPG (with 1/2 of the time riding above 80MPH, and 1/4th of the time stuck in traffic). Not so bad, I'd say; though I wished for better.

The Yamaha R3, or the Honda CB300F look like nice replacement bikes, with better fuel efficiency!

Please, buy a 300, and report back how much better you like it

Your gasneedle has no influence whatsoever when you're at wide open throttle.

I've bought 145 and 150 mikuni jets this time. Cause there's visibly a difference between Dellorto and Mikuni. I still find it quite interresting though, that with a way to large jet i will reach 140 KMh now. Oh well! I'll report back when i installed my 145 Mikuni jet into my bike.

Here's some photo's BTW.

upper hexagon is mikuni 150
The lower round one is dellorto 148








It may be a bit hard to see on the pictures, but theres a considerable difference in diameter, Also the mikuni is differently structured then the Dellorto.

Quote from: Atesz792 on May 06, 2015, 02:03:31 AM

Quote from: MeeLee on May 05, 2015, 03:31:29 PM
I believe some bikes like the GS where restricted, for reasons of insurance or licenses...
They where not to exceed 30BHP or something, to fall into a smaller category of bikes, if I'm not mistaken.

I'm not running too lean. I did raise the needle by 3mm before, but it was running rich (exhaust smelled like gasoline, and became black over time), so I removed the washer, and now raised it by 1.5mm instead of 3, and it seems to work just perfectly.
Top speed now is 85-87MPH, so about a 4mph increase from before.

Before I felt indeed it was starving, especially around 4-6k RPM.
Now it revs really smooth all across the rev range, and MPG is around 52MPG (with 1/2 of the time riding above 80MPH, and 1/4th of the time stuck in traffic). Not so bad, I'd say; though I wished for better.

The Yamaha R3, or the Honda CB300F look like nice replacement bikes, with better fuel efficiency!

Please, buy a 300, and report back how much better you like it

Probably a lot better!
The Yamaha R3 is about 50LBS lighter, and lower center of gravity, which makes a lot of difference; all the while having the same top speed. Also has 10-20MPG higher than the GS.

The CB300F only goes to 100MPH, but has a much more comfortable upright seating position, and is around 75lbs lighter, and has about 30MPGs more, so yes, any of these bikes will outdo a GS for me.(very rarely will I take a bike beyond 90MPH anyway).

Kawasaki will come out with a naked version of the Ninja 300 next year, something to look forward to as well...

I think I would get bored too quickly on a 300. I'm already looking forward to a 600cc

Quote from: MeeLee on May 06, 2015, 03:53:13 PM

Quote from: Atesz792 on May 06, 2015, 02:03:31 AM

Quote from: MeeLee on May 05, 2015, 03:31:29 PM
I believe some bikes like the GS where restricted, for reasons of insurance or licenses...
They where not to exceed 30BHP or something, to fall into a smaller category of bikes, if I'm not mistaken.

I'm not running too lean. I did raise the needle by 3mm before, but it was running rich (exhaust smelled like gasoline, and became black over time), so I removed the washer, and now raised it by 1.5mm instead of 3, and it seems to work just perfectly.
Top speed now is 85-87MPH, so about a 4mph increase from before.

Before I felt indeed it was starving, especially around 4-6k RPM.
Now it revs really smooth all across the rev range, and MPG is around 52MPG (with 1/2 of the time riding above 80MPH, and 1/4th of the time stuck in traffic). Not so bad, I'd say; though I wished for better.

The Yamaha R3, or the Honda CB300F look like nice replacement bikes, with better fuel efficiency!

Please, buy a 300, and report back how much better you like it

Probably a lot better!
The Yamaha R3 is about 50LBS lighter, and lower center of gravity, which makes a lot of difference; all the while having the same top speed. Also has 10-20MPG higher than the GS.

The CB300F only goes to 100MPH, but has a much more comfortable upright seating position, and is around 75lbs lighter, and has about 30MPGs more, so yes, any of these bikes will outdo a GS for me.(very rarely will I take a bike beyond 90MPH anyway).

Kawasaki will come out with a naked version of the Ninja 300 next year, something to look forward to as well...

I would want a different bike too if i couldn't use full throttle because my bike wasn't tuned right.
Changing jet's cost $10, buying a tuner for fuel injection: a couple hundred to over a grand depending on ow nice of a tuner you want 
When carbs break you put in new gaskets, when your computer breaks you give the dealer $400 for a new one. If they still carry the part. If they don't your bike is now scrap. Or, you could refit it with carbs 

It just seems to me that computers are more smoother than carbs. I've always have really bad luck when it comes to carbureted vehicles.

Quote from: ragecage23 on May 06, 2015, 07:35:58 PM
It just seems to me that computers are more smoother than carbs. I've always have really bad luck when it comes to carbureted vehicles.

Carbs aren't all that bad. its easy to DIY, and tuning parts are cheap. + there's an abundance of second hand carbs floating around the interwebz.

IM sure a right tuned computer will do the job better, but its all just so expensive.

OT: With changing down the jetsize, to 140 dellorto now, im reaching 145 KM/h allready, So im getting there. I wanted to put in my freshly bough mukini jets, but they didnt fit  screw thread too thick. 

Carbs.   Somewhat simple to do from when I've watched some guys do them. . On bikes and cars! .. but patience with task, attention to detail an 'doing it right!' is required! .. don't rush it. . The faster you go the reminder you get!

I've watched carb shop pro's do a rush/cheapo job too. At a friends request..  the Holley worked...  mostly. . 'Was the shops fault' obviously?  .. my Holley rebuild at same place was flawless. .. 'sort it out properly please' nod... price was still good too! Lol

Do the whole job, not the good enough job!

I don't know,
there's always something wrong with the GS carb.
It seems to take a cold day, to get the carbs out of sync; and every time you adjust them, you risk of breaking a bolt or nut, or the floater, or whatever.

Usually fuel injection systems, once they work, they work fine, for many years!
Aside from pouring some carb cleaner in the fuel every 5-10k miles, there's really nothing you need to do.

All I want is a lighter bike.
I'm not fond of 400+ LBS top heavy bikes like the GS.

It appears that the Yamaha R3 outperforms the GS in about every area; fuel economy, weight, acceleration, top speed, riding comfort, etc...

Meelee.... meelee... meelee, please......

Ok, here we go again. You know, I don't even have the energy to research if the R3 actually compares as you say it does. The important part of this conversation is *apparently* carbs vs. injection but it *might* be R3 vs GS based on what you just said. So, I'm going to address these one at a time, and try to put this to rest, so we can all go back to thinking about krav's problems (because I'm interested to see how he gets this sorted, but every time I see a new post in this thread it's more off topic. BTW nice pics krav!!)

FIRST OFF Carbs vs Injection. There's really no question that in injection running flawlessly vs carbs running flawlessly, injection will take it. There's no argument there. What some of the other guys (and me) are saying is that when they AREN'T running flawlessly (which WILL happen if you aren't buying a brand new bike every couple years, and might happen even if you do) it's probably going to be preferable to have carbies.

Are they a royal pain to take apart? Yep. I hate it. Do they occasionally do strange things? Yep, see the actual content of this thread. If they break, can you buy bits and bobs to fix them pretty cheap (see every bike part-out on this site, and your local junk yard, and the internet), and then, after a bit of (possibly lots of) tuning, you'll be back in business. With enough research and effort, fixing (non-outlier) carbs to work well can be done on your kitchen table. Breaking internal parts (like you reference) should be pretty difficult if you're not like, using a sledge (hammer, not the user) to disassemble them.

With injection, if it's done, so's your bike. Take it to a shop. Sure, maybe you can do a little diagnosing, but your bike has a brain, and if its brain is fried or malfunctioning, so are its legs. It might be smoother (maybe after you buy a $100 piece of kit, maybe not), and we'll all end up with injected bikes some day, but until I need to, I'm willing to sacrifice some performance in favor of fixability (plus, I kinda like the way carbies feel when they're tuned up  )

Moving on. R3 vs GS

I really have one thing to say about this. The YZF r3 probably DOES kick the pants off the GS. It was released what, almost 20, 25 years after the GS? If it WASN'T vastly superior, then we'd have something to write home about. The R3 also costs the same as 5 gs5s right now, so there's that. I'm sure that even at 300 CCs, it's got VTEC VTEC VTEC VTEC or something similar and all sorts of bits and bobs that make it go quick. Nice. Great. Pray to the Yamaha Gods that it never stops working when you're short on cash, because if it does, straight to the dealership you go. In a truck.

Now, Krav, any developments??

Quote from: MeeLee on May 07, 2015, 11:35:13 PM
I don't know,

Usually fuel injection systems, once they work, they work fine, for many years!
Aside from pouring some carb cleaner in the fuel every 5-10k miles, there's really nothing you need to do.


I'm not fond of 400+ LBS top heavy bikes like the GS

Carb ..... CARB??? Cleaner?? In an injection system? ... Righto... You do know that the cleaner fluids only just maybe might help to slow down crud build up in injectors... Of whatever type of cleaner too!...... They don't restore bad injectors.... Ultrasonic baths or replacements will help though.... Either of which you go to a shop and pay for!

.....Turning up to a nudist beach wearing a sewn on Eskimo suit probably isn't a good idea either!

I don't understand the whole 'I don't like this millstone neckchain I just bought cos it's no good" concept at all!!

Quote from: mennobike on May 08, 2015, 01:01:42 AM
Meelee.... meelee... meelee, please......

Ok, here we go again. You know, I don't even have the energy to research if the R3 actually compares as you say it does. The important part of this conversation is *apparently* carbs vs. injection but it *might* be R3 vs GS based on what you just said. So, I'm going to address these one at a time, and try to put this to rest, so we can all go back to thinking about krav's problems (because I'm interested to see how he gets this sorted, but every time I see a new post in this thread it's more off topic. BTW nice pics krav!!)

FIRST OFF Carbs vs Injection. There's really no question that in injection running flawlessly vs carbs running flawlessly, injection will take it. There's no argument there. What some of the other guys (and me) are saying is that when they AREN'T running flawlessly (which WILL happen if you aren't buying a brand new bike every couple years, and might happen even if you do) it's probably going to be preferable to have carbies.

Are they a royal pain to take apart? Yep. I hate it. Do they occasionally do strange things? Yep, see the actual content of this thread. If they break, can you buy bits and bobs to fix them pretty cheap (see every bike part-out on this site, and your local junk yard, and the internet), and then, after a bit of (possibly lots of) tuning, you'll be back in business. With enough research and effort, fixing (non-outlier) carbs to work well can be done on your kitchen table. Breaking internal parts (like you reference) should be pretty difficult if you're not like, using a sledge (hammer, not the user) to disassemble them.

With injection, if it's done, so's your bike. Take it to a shop. Sure, maybe you can do a little diagnosing, but your bike has a brain, and if its brain is fried or malfunctioning, so are its legs. It might be smoother (maybe after you buy a $100 piece of kit, maybe not), and we'll all end up with injected bikes some day, but until I need to, I'm willing to sacrifice some performance in favor of fixability (plus, I kinda like the way carbies feel when they're tuned up  )

Moving on. R3 vs GS

I really have one thing to say about this. The YZF r3 probably DOES kick the pants off the GS. It was released what, almost 20, 25 years after the GS? If it WASN'T vastly superior, then we'd have something to write home about. The R3 also costs the same as 5 gs5s right now, so there's that. I'm sure that even at 300 CCs, it's got VTEC VTEC VTEC VTEC or something similar and all sorts of bits and bobs that make it go quick. Nice. Great. Pray to the Yamaha Gods that it never stops working when you're short on cash, because if it does, straight to the dealership you go. In a truck.

Now, Krav, any developments??

Bloody good speech!

As a matter of fact, there are developments. The jats that didnt fit (the hexagonals) Well when i went by the store to buy more they were closed. Wasn't to happy about that, Which store does close structurally every wednesday..
Anyway. The photos above do show 2 almost same sized jets, yet theres a big difference in size.
Now when i did even more research, i saw everywhere people were putting ROUND jets in their Gs500 carbs. This seemed strange to me since i thought mikuni only made hexagonal screws.

So i found a nice little shop in my city, where i could actually buy me some round mikuni's. I bought a pair of 142,5's and will be installing them this afternoon.

This is what i've learned:
Mikuni Hex: Measured in CC's of flow
Mikuni round: Measured in micrometers. (just like dellorto)

Don't believe me? Here's a picture.

Left is Dellorto 144
Middle is mikuni round 142,5
right is mikuni hexagonal 145
They might not be lined out perfectly, but its absolutely close enough. Specially since all i have here is office tape, paper and my jets :p

Just spend some time in the workshop:
- Put in 142,5 main jet
- pilot airscrew 3 turns out each
- Balanced the carbs (who knew such little adjustment, could make such a difference!)

Setup:
- Lunchbox
- Takkoni slip-on (no DB killer)
- no restrictors (far is i know)

Balancing the carbs, Man that makes a difference. Its now so incredibly butterly smooth! I could actually relatively comfortably achieve my topspeed, which is 148 KM/h now. Faster then i've ever seen the bike go! However, not as fast as it can be im still 12 Km/h out of my least acceptable target topspeed.

anyone have any ideas where to go next?

Have you tried hitting it with a hammer?

Really, though. I'm at a loss. Are you sure your gear ratios have never been altered?

Modify the wind resistance profile? ... use 5th rather than 6th to boost you up more?

My still stock powertrain Aussie '06f will pull up to 160km indicated before I even tuck down. .. then it's a slightly relaxed/slowish climb to 195km indicated..  IIRC I changed to 6th only after 175km?

doing 175 in 5th? :0 That doesnt sound very healthy for a 1999 engine.
May i assume that 160 indicated is about 150 IRL? My indicator should be spot on at 130 km/h as thats the speed i tuned it at with my gps.

@ Iarn, Its hard to say if someone has changed the gears inside the gearbox, but its a possibility. The sprockets ar 16/39 though, which is standard and i have the rear wheel + tire from a 2003 Gs500.

I think my chain and therefore sprockets may be wearing out though. Could this issue be caused by worn out chain and sprockets? I know i should change them soon anyway, but can it be a factor in this problem?

I've also tried setting up my tachometer, to no avail so far (Vapor dash from trailtech) So thats no help either.

Worn chain/sprockets won't effect top speed much. An old rusty chain my rob a few ponies, but not like your experiencing. And worn sprockets won't slow you down unless the chain is skipping teeth. Wish I could tell you where else to look