Engine Trouble Revs

[icecold037]

Seems like when im riding my bike it never reaches max revs. It revs A LOT faster when im stopped, pull in the clutch, and open the throttle 100% then when im actually riding it and open the throttle 100%. What may be the problem? I've tried setting the carbs needle in every position but the max revs stays the same in all. Adjusting the needle only seemed to affect the engines low end.

 

[HeadSmess]

yes. yes, there is a major problem here.

its called "load". gravity is part of the issue, friction another.

pop the clutch in a car and give it full throttle and see what happens...

not really sure how you fix it, either

 

[Neon]

You can always reduce the "load". Put the bike on a diet, put yourself on a diet. run smaller rims and tires. Then there is also a matter of rev limiters. Don't really know if these have one or not. I'm guessing they don't. Friction also plays a big part in this as well not just gravity.

 

[Deleted member 12676]

The fact that the 2 strokes Grubee engines are not optimized with their porting causes them to not reach maximum revs under load. Click on my signature link to find out about porting.

 

[Big Red]

Engine Load.

Seems like when im riding my bike it never reaches max revs. It revs A LOT faster when im stopped, pull in the clutch, and open the throttle 100% then when im actually riding it and open the throttle 100%. What may be the problem? I've tried setting the carbs needle in every position but the max revs stays the same in all. Adjusting the needle only seemed to affect the engines low end.

Hey Ice, Seriously check out Jaguar's stuff. He knows what he's talking about.
Big Red.

 

[shell shock]

Not only is this limited by physics (grav, friction and the like) but if our engines ran at the no load max RPM we would surely detonate!

 

[TOTAL CARNAGE]

Don't worry about it!!!!!!!
If you are reving it to 100% throttle with the clutch in and riding it wide open all the time it's not going to last long anyway!!!

 

[icecold037]

The fact that the 2 strokes Grubee engines are not optimized with their porting causes them to not reach maximum revs under load. Click on my signature link to find out about porting.

thanks jaguar! i've never done any porting with my engines but i was thinking of fixing the transfer ports like shown in your signature. wish me luck lol.

 

[icecold037]

Also, do you think if i change my sprocket from the standard 44T to a 56T that i would gain both low and top end since my engine isn't reaching max rpms under load anyways with the standard sprocket?

 

[HeadSmess]

most people tend to go to 36, not 56, but if you think it needs to rev faster, go for it...

not helping, am i?