I'd like to discuss timing.

[sredish]

I'm running +4 now, but I have very minimal time on it, in fact just about 3 hours, and I also lightened the flywheel so in the 3 hours it was pretty hard to determine what caused what.

 

I have a buddy who is running like +10. A few on the forums are running +7. When is advancing the timing enough and what would one person expect to see going from stock to +4 and then what would they expect to see going from +4 to +7 and even more? You obviously don't want to get it too advanced, but how far is "too advanced"? I never really have heard a flat statement regarding the timing, so here's the chance for everyone to speak up.

 

Later.

[tats4life]

+4 for is awesome for mx and trail or even duning. anything over that can cause your bike to heat up real fast. I got a buddy that runs dirt drags and his timing is +10. His motor feels like it's been held wot for about 6 miles after it's only been run 330 ft and shut off.

[sredish]

Cool. I was just searching and reading. I swear I've searched before and not pulled much info, but I found some stuff this time. Faintly do I remember Banchetta's dyno that shows stock, +4 and like +7 or something, and his dyno showed +4 making the best power for stock and ported machines, up to +4 mil. I'll just leave it the hell alone. His dyno sheets have been pulled, so you can't see them anymore.

 

Mostly, I was just wondering what the fellas running the more advanced motors knew that I didn't, you know, don't want to miss out on free hp, like that really exists. I know that the ignition curve falls off quite a bit at higher rpms, and maybe this is why the draggers like it so high, because they're in the higher rpms mostly and that allows a more advanced timing in that higher rpm area. Who knows.

 

Later.

Edited July 11, 2004 by sredish

[SICK BOY]

When I talked to the guys at Vito's Performance they said not to go over +4 unless your running a drag only quad.

[superchicken]

like tats said you have to put the spark where the engine lives or the engine wont run up to its potential.doing so with like a +10 you cause more heat and wear cause your firing the cylinder way early in its up stroke,but you have to have it that way in an engine thats spinning up that fast.kinda hard to explain,i found a link its for cars but in theory its the same it might helphow stuff works

[frocashmoney24]

i like the +7 as i do drag occasioanlly and it does great, ive run the +4 when i do mx, andi m thinkin about runnin the +4 all the time, cause now that i thinka bout it, it does heat up quickly...

[loganskinner]

how do you adjust the timing? do i need to get someone to do it, or can i do it myself? and what are the benefits/downfalls to a change in timing?

[frocashmoney24]

you either have to buy a adjustable timing plate, or you can mod the stock one, you can do it yourself, if you have bolt on mods, +4 is good for you, it will give you more power

[JKJK]

a mx or recreational quad engine will opperate in a very wide rpm range wich will benifit from a not so adv initial timing setting,where as a drad quad will opperate a WOT all the time,and the advance curve can be taylored for a predictable rpm range for optimal results.i have no expierince with this other than what i learned from this site.