330r wont hit top end

[250rracer90]

hey everybody i got a 86 250r with the psi 330r pv kit on it psi pipe fmf silencer 40mm carb airbox delete intake ricks hotshot box went riding today took it out in the field opened it up and i got to a certain rpm almost wide open and it wont quite get there acts like it hits rev limiter, figured it was a plug getting ready to foul, took the plug out and it was almost caramel not soaked with fuel or nothing was a real clean burning plug i used the same plug with a tank of fuel before but it ran really rich put to much oil in the gas (my bad) im wondering if thats all it is but when i ran good fuel in it maybe the plug cleaned off and still isnt firing right? i dont no what else it could b besides moving the needle up in the carb or something, any help would b appreciated

[baycitysteve]

what's a hotshot box ?? if it's like a roost boost i'd take that off or if has anything to do with the spark or ignition ..

[250rracer90]

its a direct replacement for the stock cdi box its suppose to increase spark, increased rpm redline and altered ignition advance curves, Advance curve allows ATV to rev at higher rpm and quicker rate, Also may be used to replace defective CDI box on stock machines

[Chazz of Blades]

Yeah, it's probably like those Big Gun kits, utter crap.

[250rracer90]

hopefully not my stock cdi went bad on me and i wasnt going to put a stock one back on it or buy one used i think ill try throwing a plug in it if that dont work then its gotta b that damn box

[RIDE-RED 250r]

Check your reed petals before condemning your Hotshot CDI. I have one and it works great. Make sure your reed petals are closing all the way and not fraying or cracking.

[250rracer90]

Ok ill take a look at them tomorrow

[rdlsz24]

How old is the clutch? My 85 was acting like that when I first got it. It would rev up but not want to go faster on the top end. I replaced the clutch and it fixed the problem. I thought it was jetting or intake at first also.

Rob

[rjs89ia]

I've heard that stock ignition and maybe even retarding the timing on a big bore engine is better. I run an rpm advance retard plate on my 310 and i think i run it at around 1 to 2 degrees retarded and it runs clean or did until i took it apart to rebuild

[250rracer90]

clutch is ok it dont slip, heres what i came up with though took the reed cage out and i dont no if this is normal or not it dont look like it but the center of the reeds look like they ate away just the first stage, i no they dont look like that brand new they also look off center with the second stage, second thing i found was the breather tube for my powervalve was rubbing on the pipe and it closed itself off so the powervalve couldnt release pressure so i imagine its loaded up, i took the plug out and i was running lean plug was almost gray not chalky but just lean, im thinking that hotshot box screwed with my timing enough to throw the carb out of tune and i just need to go back threw it and set my air screw again, i got some pictures of the reeds and i took a picture of the inside of the intake port to show what i mean about how the reeds could have ate up they look like theyve hit the pillar in the middle of the intake but my guess is as good as anybody elses, i really think i just need to take time to sit down and retune, mayb reeds?.....

[RIDE-RED 250r]

What kind of reeds are those? Im not liking the looks of pic #1. Seems kicked off center, like you said. Also, if you look at the reeds from the engine side, are they laying nice and flat against the cage or is there a gap?

[250rracer90]

there boyesen carbon fiber reeds 2 stage same thing i got on my trike, they lay flat there very stiff i put my finger nail under each side on each stage and pick them up a little bit they have plenty of snap still to them, they just looked screwed up lol

[RIDE-RED 250r]

OK, sounds like they arent too worn. No fraying, cracking or chipping on the leading edges? If so, straighten those 1st stage petals and give it a try. One thing at a time....

[250rracer90]

not from what i can see, they look fine to me ill straiten them out and see what that does hopefully they didnt crack under the hold down plate and thats why there off center....

[Dirtcrasher]

I only browsed through this but: When I'm too lean, the top end never top outs, 4 stroke or 2 stroke. Fatten the main up a bit and see if it stays the same, sputters or takes off like a rocket. 15$ in a few jets is well worth trying....