HELP tuning my new pipe

[KingJeff801]

I just got my new V8 pipe (the 28mm ment for stock) from Jiang wayne, I put 7g rollers in, I am running a 90 jet, kelli vari, daytona #2 ramp plate, and complete stock clutch. It seems my bike pulls a little more in the mid but lost top end not much change at all, is clutch springs the answer? or jet changing?

[Bear45-70]

Too words for the jetting issue. "PLUG CHOP."

[mr pibbs]

I just got my new V8 pipe (the 28mm ment for stock) from Jiang wayne, I put 7g rollers in, I am running a 90 jet, kelli vari, daytona #2 ramp plate, and complete stock clutch. It seems my bike pulls a little more in the mid but lost top end not much change at all, is clutch springs the answer? or jet changing?

What is current top speed? Have you considered some 9:1 gears?

I doubt changing jet/clutch are the answer although you want to make sure you are not running rich/lean by checking the plug. I would consult the rollers to make sure the powerband is hitting just right. 8ish might be another place to start tuning from.

[trains420]

Yea use 8 or 8.5 gram rollers. you're probably not even switching into second gear. i wasn't with 7 gram rollers, or i couldn't get over 45mph and it was winding it out. i got 8.9:1 gears.
put the stock roller weights back in if there good, there probably better. but get a little lighter. and stock gears around 45, 48, maybe 50 is the top it will do. and that's really winding it out there.

[trains420]

i have the same muffler as you. i had a uni-filter, and a 90 main jet was running too lean with me. try a 95, maybe even a 100 but i'd say 98. try a 95 or a 93 if you got it, or do a plug chop. if it's not any different when you put the 95 in, it can't kill it. it seemed like i didn't have enough power with a 90 main jet and all that stuff. it done ok, but it was running kind of lean. try a plug chop, or just try a 95 main jet, then try out a plug chop. use a 8 plug if your somewhere where it's hot. my scooter also needs more gas. but 90 and a uni was just lean for me. don't run too lean, but a little rich would be ok. bring an extra spark plug and ratchet and socket. and a high number sand paper.

[maddog]

if this is for a stock derestriction you will need 9 to 1 gears, yes you have to change the center spring & clutch springs along with a few more mods, pm me for the correct way to do your engine

[KingJeff801]

So I changed the jet to 95, put 7 and 9 gram weights , Did a plug chop and holy * that thing look liked it had been through world war 3, Changed the plug. The results are a lot better than before...good mid pull and my needle hit the top of the m on the MPH. I also installed a VDO cht and at WOT it seems to be at 350 is that too high? I am thinking i acan get some more out it. I have a 1.5k center spring that i haven't installed yet. I was also thinking about up jetting to 100 and maybe adding some more weight to my pulley. any other input would be great.

[trains420]

what did the spark plug look like with a 90 main jet in it? are you using an uni-filter?
350? is that what i'm hitting, i wonder, i got taht same pipe and use a bigger main jet and air intake modifications. that's hot isn't it? if your gauge is accurate, i'd say 350 on a hot day, at the hottest it gets, would be ok.
have you changed gears? if not, then your doing about as fast as your engine will let you do. and it's probably not good for it, cause it's at high rpm, with the easy to push, not much top speed, stock gears. you got stock gears?
if 95 main jet runs good, then try 98, if you can find one. if 95 looks lean, then go to 100 if that's all you got, and if it's too rich, and doesn't run right, use the 95. or get a 98, but i don't know where, to get one. it's a stock engine, and a stock carburetor, so stock engine can take more punishment, and all you could really be lean is 1 or 2 sizes. keep an oiled air filter. and the stock carburetor, well, i've never seen jets for all the different sizes. inbetweens. an aftermarket carburetor, a good brand one, you'd be able to find a bunch of different jet sizes. but it's stock engine. so get the engine running good. and try to find inbetween, or keep an oiled, air clogged filter.

[KingJeff801]

oiled air filter......whats the process and pros and cons for it?

[trains420]

if you use the stock air box, open it and take the air filter out. your supposed to oil it, clean and new and a bunch of oil, but make sure it's not dripping, will make less air flow. the oil catches dirt. and richens up your mixture. if you used the air box mod, then put a little, tiny piece of tape over one of the holes, just covering like an 1/8 of the hole. that's what i did. if your still lean. and 100 is too rich.


do you have stock gears? your engine's too much for the stock gears. for the most part. the stock gears are actually pretty low end. your turning that gear, and i don't know what it takes, but 3 more times to go the same speed as me 12:1 and 8.9:1. three more turns, for 1 turn, 3 more engine turns. 3 more easy, 3 more high rpms. get some gears. lower rpms will lower your temperatures, and if you have lean problems, mess around with air and jets. so hard. just get it going, and it should go. it's a stock engine.

[KingJeff801]

I have stock gears right now but am waiting on burnt toasts 9:1 gear buy.... just wondering if i should go with the 100 jet and change jets... the 350 degree worries me.

[trains420]

do you got an uni-filter?

and when does your scooter run 350? it can be idle, then the emulsion tube of the elite carburetor, or the main jet. it can also be stress. i guess. just when. maybe it's an engine not running good. if your running 350, and done the airbox mod, then i'm running 350 too. maybe we need to ask if we need to run a water hose with our scooters, to cool them down, and spray it at the engine as we go.

just put the 100 main jet in and see if it sputters. i did, and got backfires. i also done other stuff, and had backfires, i got rid of it. had to lean stuff out, but 95 seemed lean and 100 backfired. so i cut off the air flow. gas makes you rich, and air makes you lean. but you have to have both.

[Wheelman-111]

Greetings:

I've had soft seizes @ 350F (probe on a head bolt) and I've had a Nikasil tolerate spikes well over 400, even 500. Gauges vary, so may I suggest you calibrate yours with a pan of boiling water? If it's accurate, pay close attention to the color of the spark plug. If it's darker than cardboard you should be OK.

The stock carb's main drawback is that the low-speed circuit can't easily be enriched. Thus when you close the throttle after a prolonged high-output state, the heat generated by that run isn't being fed much cool vaporized fuel. Look for the temp to rise abruptly when you close the throttle. If it's happening, you should consider swapping to a more-adjustable carb like Arreche-for-Honda. A CT manifold opens up many more options.

[KingJeff801]

Greetings:

I've had soft seizes @ 350F (probe on a head bolt) and I've had a Nikasil tolerate spikes well over 400, even 500. Gauges vary, so may I suggest you calibrate yours with a pan of boiling water? If it's accurate, pay close attention to the color of the spark plug. If it's darker than cardboard you should be OK.

The stock carb's main drawback is that the low-speed circuit can't easily be enriched. Thus when you close the throttle after a prolonged high-output state, the heat generated by that run isn't being fed much cool vaporized fuel. Look for the temp to rise abruptly when you close the throttle. If it's happening, you should consider swapping to a more-adjustable carb like Arreche-for-Honda. A CT manifold opens up many more options.

Thanks Wheelman, I know it varies but what is a good temp i should be shooting for with my set up? my set up is accurate in my signature

[808BMW]

I'd leave the main jet and try moving the needle, richening the jet will only lose even MORE top end. As far as temps go, I sit around 275-300 for most riding, 325-350 during long pulls under power. I'll let it creep to 375-400 on occasion if someone needs that extra long throttle twist to learn a lesson.