gs500f exhaust, dyno, gearwheel (need some help urgently)

[Langus]

I have bought GS500F K5 few months ago. I have version with 35kW (approx 48hp) and max speed was about 180-190km/h, then I bought Remus exhaust (caliber 54mm, racing).

I have a problem since exhaust instalation, my bike does not accelerate good in upper turns (good at lower), my mechanic advised my to re-jet my bike.

I do not know what to do, to buy dynojet kit or just bigger jets? I was looking this kit, but it is ONLY FOR US. MODELS!!
http://www.dynojet.com/pdf/3156.pdf <- does anyone know

second option is well known dynojet kit for EU. models, but US. have better diagram.
http://www.dynojet.com/pdf/European...i/E3128.001.pdf

My second problem is gear wheel (original is 16) and my bike comes just to 9000rpm (I will rechange it with 15)


I have few questions:
1.Is there any need to synchronize carburettor after re-jetting?
2.What is difference between re-jetting with bigger jet or dynojet kit?
3.Does anyone know difference between US. and EU. models?
4.What is your max speed?

Please help me!!!

Best Regards, David

PS. Sorry for my English, because I am comming from foreign country (Slovenia).

[scratch]

Welcome!

Your mechanic is correct, you will need to rejet.

While I can only pull up the link to the US Dynojet, if the jet sizes are the same between the two kits, it shouldn't matter which one you get.

Topping out 9000rpm in 6th gear with a 16 tooth front sprocket is normal. 6th is really an overdrive. 5th will get you over the 9000rpm hurdle.

1. Yes.
2. The Dynojet kit comes with new needles and springs, and I think a plug for the slide; while jetting it with individual jets may be less expensive, it can be difficult to obtain the needles, hence we just shim up the needle.
3. Minor diferences being in the carbs, the jetting primarily, and maybe a restrictor plate (for under 33hp licences).
4. 115mph was my max before I switched to a 40 tooth rear sprocket; now it's 105mph.

Your English is very good, I understood you very well...or, well, I hope I did.

[Alphamazing]

I've got a question now, just as a kind of reference thing.

I rejetted my carbs and didn't sync them. After a while I decided I didn't like it running super rich so I brought the jetting back to stock and didn't sync the carbs. Would I need to sync them? I'm doing the 7500 mile service tonight so I've got to sync them anyways, but I'm just curious.

[scratch]

It has always been my experience, and my training, to sync the carbs after every intrusion or adjustment (including valves). The reason being that you just don't know if you bumped something upon reassembly, or mounting back on the bike. Even the flexing of the carb mounting brackets can alter the float levels between the two carbs (admittedly very little, but I will stand behind my words and experience).

[FedExMike24]

Wow someone who actully makes exhaust systems for the 04-05 Fs! Looks like they are also in the process of releasing a slip/bolt on for the newer bikes too!.

[Alphamazing]

Scratch - I understand what you're talking about. Thankfully for me, however, after two removals, rejets, and reinstalations, my carbs were still synced.