may have overheated

deathwish · Post by **deathwish** » Fri Nov 11, 2005 7:07 pm

well i put my k&n Filter on with a size 80 main jet and went for a ride it seemed to be okay...I took it out tonight for a long ride and it wasnt running completely normal but not horrible either so i just took it easy. i stopped for about a half hour and started again andd my acceleration sucked and it would not pass 40.....so i stopped to look at somethings and i figured it may be running a little to hot so i let it cool down and started it back up no problem and ran fine for about 5 mins and then went back to the same thing. i took my plug out when i got back and it looked like i was running lean so i put in a bigger jet and it ran better but not as good as it was runnin before..... What should i cheack next????????

vette76 · Post by **vette76** » Fri Nov 11, 2005 7:31 pm

to tell you the truth, i have tried this, and i lost some of the power it had with the stock air box. it kinda made it bog. the only thing it did for me was make it louder. because you aernt changing a slow jet too, you lose the snap in the throttle it once had. if it ran better before, i would put it back stock.

maddog · Post by **maddog** » Fri Nov 11, 2005 8:04 pm

A 2 srtoke will not overheat but soft seize at full throttle meaning the engine will stall, it can be restarted but will continue to stall at full throttle.

deathwish · Post by **deathwish** » Fri Nov 11, 2005 11:40 pm

well it never really did stall so u think im okay???

vette76 · Post by **vette76** » Sat Nov 12, 2005 3:08 am

its not okay to run that hot. it will cause piston damage, and really score/mess things up.

burnt_toast · Post by **burnt_toast** » Sat Nov 12, 2005 9:37 am

vette76 wrote:its not okay to run that hot. it will cause piston damage, and really score/mess things up.

Yeh I think I may have done this while experimenting w/ an open filter on my vento. Now it has low compression and won't start..

looks like time for a rebuild.

MYSTERE1 · Post by **MYSTERE1** » Sat Nov 12, 2005 6:01 pm

add more fuel. if its running hot and bogs you haven't got a big enough jet. keep trying and you will find one that works.

MySpree · Post by **MySpree** » Sat Nov 12, 2005 9:18 pm

for ssome resont i had to down jet to make my spree run good... idk who thou

darat · Post by **darat** » Sun Nov 13, 2005 11:20 am

if you are running lean then y dont u put some 2 stroke oil in the gas tank to make up for that slow jet. so you wont burn up the rings.

Post by **noiseguy** » Sun Nov 13, 2005 2:32 pm

darat wrote:if you are running lean then y dont u put some 2 stroke oil in the gas tank to make up for that slow jet. so you wont burn up the rings.

Actually, putting in 2-stroke oil into the gas will further lean out the mix, since you've replaced (by volume) some of the gas with oil.

As far as downjetting goes, running a larger jet in a stock Spree does nothing but slow it down and waste fuel. "The leaner the meaner."

darat · Post by **darat** » Sun Nov 13, 2005 2:43 pm

so your saying that if u put 2stroke mix with the gas and running the oil pump it is makeing it run leaner i dont get it. your giveing the eng more oil so it wouldnt run lean. lean means the engine is not geting enough oil right?

burnt_toast · Post by **burnt_toast** » Mon Nov 14, 2005 1:34 am

darat wrote:so your saying that if u put 2stroke mix with the gas and running the oil pump it is makeing it run leaner i dont get it. your giveing the eng more oil so it wouldnt run lean. lean means the engine is not geting enough oil right?

lean means ur getting too much air, not enough fuel. fuel passing through the crankshaft cools the engine, more so w/ the correct ratio of oil.

Post by **noiseguy** » Mon Nov 14, 2005 1:01 pm

Running lean means more air, less fuel. Hotter burn, hotter jug and piston.
Running rich means more fuel, less air. Colder burn, until unburnt fuel starts burning in the exhaust, then the exhaust heats up, heating the jug.

Hotter = more efficient = more power = shorter life for rings

Low octane = Hotter burn
Leaner = Hotter burn
Higher compression = hotter burn

There are even more tradeoffs. Honda did the tradeoffs and created a low compression, low power engine which will run a long time and met power regs. As you manipulate things you have to try to keep everything balanced. That's why plug chops (and the like) are important.