Lunchbox and Jetting, Quick questions!

[radodrill]

as the saying goes if it aint broke dont fix it.

Noooooo; If it ain't broke, you're not tryin'.

[Jayke]

Lowering the needles will somewhat reduce the mid-range pull, but also adjusts the transition to the top-end.  Since you notice a drop in pull going to the top end, this should smooth it out.  If you feel a sudden increase in pul going to the top end, then your needles are to low.  If necessary, you can use flat washers under the needles to get finer adjustment than with the e-clips alone.

Ta for the info, well, when the jets finally come...(hoping on tomorrow, damn postal service!) I will get the needles done too and hopefully we will see a positive gain...
I still don't get though how people go SO fast, I got to 85mph and it felt asif my body was going to be torn apart lol and it wasn't even that windy!

That sucks; hope you get them soon.  I just picked up some jets, spark plugs, oil, and filter from the dealer; in addition, new tires are on order

I picked up all main jet sizes from 150-160; so I'll be able to see what works best for me 

That must of cost alot for all of the jets! Unless ofcourse in America you get cheap jets too - 2 jets from motocarb for the GS is £8.50ish + £1 for shipping thats like 16 dollars ^^.

Your bike is gonna love you for sure my bike is in need of new tyres, too; they've not much tread left on them before they become illegal  but I'll be getting some Pirelli Diablo Rosso 2's for her soon. Well, when I have the money lol!

Last of my plans, which will come probably later on this year when the bad weather comes back is a full teardown and MAJOR cleaning + respray of the frame and engine (properly this time)! - But lets get her running great for now , couldn't do this without you and this forums help, honestly!

And on my side of things , ive readjusted the mixture screws to 3 and a half turns out and further adjusted the idle so its idling at around 1500 nice and flat and everything is running great so i think thats as far as im going with it as the saying goes if it aint broke dont fix it.

Great man! Glad you got it all sorted finally after the wait for the jets lol! In time I will be (hopefully) trying to find the best setup I can for what we have, so if I happen to find anything significantly better, I will be sure to let you know about it!

PS: I don't know if there is already, but there should so be a UK GSTwins meetup at some  point, that'd be awesome!

Noooooo; If it ain't broke, you're not tryin'.

Hahahha!!! 

[radodrill]

I still don't get though how people go SO fast, I got to 85mph and it felt asif my body was going to be torn apart lol and it wasn't even that windy!

Haha; 70-75 seems fine, but I'm not comfortable going much faster on 2 wheels; I'm comfortable driving much faster in a sports car (on the "track" of course).  What gets me is seeing the motoGP riders on the Isle of Mann touching after getting airborne; I don't know how they keep from crashing with such a heavy tank-slapper.

That must of cost alot for all of the jets! Unless ofcourse in America you get cheap jets too - 2 jets from motocarb for the GS is £8.50ish + £1 for shipping thats like 16 dollars ^^.

I found a place online that sells jets for $5.99/pair; I got my local dealer to match that price.

Your bike is gonna love you for sure my bike is in need of new tyres, too; they've not much tread left on them before they become illegal  but I'll be getting some Pirelli Diablo Rosso 2's for her soon. Well, when I have the money lol!

I ordered a pair of Pirelli Sport Demons    got them for $220 a set; then about $40/tire to have them mounted.
The Bridgestone BT-45s on it now are actually the original ones from the factory; the both have dry-rot (more so the front) and the center of the rear is almost down to the wear bars, while the sides have a lot of tread left; I guess they've mainly seen straight cruising and not much riding in the twisties.

[Jayke]

Yeah I know what you mean, seen a few TT people do it, theyre like in the air at upwards of what, 150mph easily, and they swerve on their back wheels after being airbourne.... Scary lol!!

70 is plenty I think, definitely on a naked bike at least, on the roads anyway. I've yet to go to a track as I'm only 20, been riding now 4 years, about 35-40 thousand miles under my belt

Those jet prices are freaking amazing lol - I went to my dealer and they quoted me I think upwards of £15 PER jet. The hell??

They're great tyres I've heard, I guess any Pirelli tyres are gonna be great though, they don't have their rep for crappy tyres thats for sure!

If you've never had Pirellis on a bike before, my god you'll notice a difference, they're SO sticky! - Look great too!


Ahhh man, when I've finally got everything done and this thread dies, I'll be sad... I could literally sit here and talk all day everyday lol. Not very often I get to talk to people with similar interests as me, I literally only know like 3 bikers and they're all limited to 125cc bikes and quite honestly are just interested in going too fast and trying to wheely lol! I need to find a biking group that does nice rides really, not sure where to look though 

[radodrill]

Just went to 22.5/65/150 with 4 turns.  First thing I notice is that when slowly increasing the throttle the RPMs initially respond as expected, then at ~1/8 throttle they jump from around 2.5K to 3.5-4KI'll see how she behaves on the road, but a 25 pilot is looking inevitable.

[Jayke]

I think that's what happens with mine. Can't be too sure, it's not too too bad, jets still aren't here. It's abit strange really, 4-5 days it's taken on 'next day' delivery. Last time it came in under 24 hours!!

Sent from my C6903 using Tapatalk

[Crasm]

On a track day i did a while back when i had my cbr1000 , i touched just over 150 mph down the back straight. I red lined it in 3rd kicked into 4th and wheeled at 130mph that makes your corn hole clench!!
On shut off at 150mph with a cross wind across the track gave the bike a weird back end wobble . . . That to was an arse clenching moment lol
Theres nuthin like a supersports on a track so much fun !!
The over taking power on national speed limit roads (stuck behind tractors) is unreal but you simply cannot use the top end legally , its nice goin for a blast with your mates on a warm sunday afternoon but if you wanna feel what a bike can do a track day is the way . .  .


I miss that bike soooo much

[Jayke]

I'd love love love a go on a supersports but I simply have no friends that ride bikes bigger than 125cc lol! I don't get it though, at 150mph wouldn't you feel like you're being ripped into pieces lol?! At 85 I was like Ahhhhhhhhh slow down plz

Sent from my C6903 using Tapatalk

[Crasm]

Fairings mate , once tucked in you feel no wind resistance at all.
However if you shut off and lift your body up over the bubble its like running into a brick wall. Your body acts as a sail.

I sold it because it was just my toy and only came out to play when it was perfect weather.
I moved house and my new house doesnt have a garage and the entry was to tight of fit to get it in my back yard plus i needed something to comure to work on cuz the mrs needed the car alot  so instead of keeping it under a cover in the back yard and risk damaging the fairing every time i got it in and out i sold it

I had a bandit 600 before it so didnt want another one and the sv650 was a little to pricey at the time  so i went for the gs . . Ill probs keep this another year and then go for a fully faired sv650

[Jayke]

Yeah fair enough I guess. Might be rid of the streetfighter lights and get a standard circle one, then get the smaller windscreen I've seen a few using which looks quite nice.

I almost went for the bandit 600 or the sv650 but I'm on the A2 license and I didn't wanna risk the insurance asking for any restriction proof so I just went for the gs too!

Plenty fast enough if you ask me, acceleration is plentiful for road use :p especially coming from a 125. I think if I had much more power I'd be more tempted to use it and get myself into much more trouble lol and I have a clean licence and wanna keep it that way.

I'm looking at probably getting a drz400 or a crf450 supermoto after a year, I came from a supermoto and they're just bundles of fun, if you never tried one, try to get your hands on one

Sent from my C6903 using Tapatalk

[radodrill]

Well I'm stepping up the main again   With 22.5/62.5/150 I had less lean popping during deceleration, but it was still present and the idle is still a bit lean; decided to mess with one jet at a time so main it is for now.  Due to the Allen screws on the float bowls, I was actually able to change gets without removing the tank/carbs; it went a bit quicker, but was more of a PITA due to the tight quarters.

[Crasm]

Right then got another funny issue
When i done the jets i purposly ran the fuel low so the tank was lighter , so when i finished i rode it straight to the fuel station and brimmed the tank.
My bike has covered 120 miles since however on a 60 mph road it stated to splutter so i put it on
Reserve and went straight to a fuel station , however i could only squeeze 10 litters of fuel in it until it was full again , meaning it still had 7 litres in there
The bike has a 5 litre reserve meaning it still had 2 litres of normal fuel capacity left.
So y on earth would it not run unless it was on reserve??
Its only been like this since changing jets.
Also im sure i get around 200 - 230 miles to a full tank usually so ive almost lost 100 miles of range because of mods and rejetting. . .is this normal?
Shes running absolutly spot on  , no issues at all !!

[radodrill]

Do you have an inline fuel filter? if so, take it out.

Also, where did you route the carb breather hose?  Normally it goes over the airbox and ends near the battery box, where it is sheltered from the wind; I've read that a lot of people with this tube more exposed have had issues withe sputtering etc at speed even with ample fuel in the tank.

[Crasm]

No inline fuel filter , carb breather cable tied to frame.
It completly ran out of fuel on normal fuel position on tap.
By the time i had slowed down and stopped it cut out and wouldnt restart until i turned the tap to reserve and it fired up and ran normally.
If i got 120 miles out of 10 litres and still had 7 litres left then there wouldnt be much diffence in fuel economy from what im at now compared to standard.
But why would it run out of fuel with still 7 litres in the tank??
Is the fuel gavity ir vacuum fed to the fuel tap??
I was thinking low fuel pressure in the tank but if that was the case  reserve wouldnt have worked either.
Just a funny thing to happen , may have to just let it run through reserve to see what happens and see how much fuel is left after doin 50 or so miles in reserbe

[Jayke]

That's strange! All I can say from my end as funny as it may seem, I've been getting more mpg since I've done these changes. Not sure why, I'd expect less but eh!

But overall my mpg is poor as it goes but I do all town riding so it's l stop start, I've been getting about 170 miles from a full tank then I'd have to switch to reserve if I remember correctly.


Sent from my C6903 using Tapatalk

[radodrill]

That's strange! All I can say from my end as funny as it may seem, I've been getting more mpg since I've done these changes. Not sure why, I'd expect less but eh!

Sure you're jetted bigger, but you don't have to crank it as much to get the same amount of power.

Think about a loo; if a 1.6 Gallon per Flush (GPF) toilet takes away everything but you have to flush 2-3 times on a 1.2GPF unit to get it all down, then the 1.2GPF is actually using more water.

Similarly when jetted too lean you have a higher specific fuel consumption to get the same power.

[Jayke]

Hahahah! Nice example you used there, I guess so though!

Another thing that might be helping is that I love the sound of this delkevic exhaust at 3-5k rpm, and I rarely go past 6k unless I'm accelerating hard. :p

I think I'm going to send her in to have the Valves and tappets done, I don't have any of the shim removal tools and so I don't wanna mess up :x

I've been reading too wrongly aligned tappets/valves give worse performance? I knew they give worse fuel consumption but didn't think performance wise!

Just abit clueless as to what it would cost me. As they charge £50 per hour plus parts. And I bet you even if they do one hour they'll charge for 2!!

Sent from my C6903 using Tapatalk

[Suzuki Stevo]

When the jetting is closer to "correct", you have better throttle response (the bike does a better job of doing what you're right hand tells it) and that means your slides can be closed more (throttle position) for the same amount of power and achieve better Mpg. I went up one size on the pilots and mains with an otherwise stock bike and still pulled off mileage in the 60's consistently (open road) with a best of 69.8 Mpg. You wrench the grip more on a lean bike.

[Jayke]

Very impressive! Just wondering on a newbie level, how are you getting the mpg figures? Cause obviously I don't know how much fuel I've used to the miles I've done lol!

Sent from my C6903 using Tapatalk

[radodrill]

Very impressive! Just wondering on a newbie level, how are you getting the mpg figures? Cause obviously I don't know how much fuel I've used to the miles I've done lol!

Sent from my C6903 using Tapatalk

Fill the tank to the brim and reset the trip odometer at the same time.  When you need to refill, divide the trip odometer reading by the amount of fuel you put in (same level as before) to get your mileage

You can also use the trip odometer as an approximation of fuel remaining; i.e. if you can typically go say 170 miles till reserve, then around 150 you start looking for a gas station.