little power

forehead949 · #1 02-22-2009, 04:10 AM

hey guys.
i recently started up my 80cc engine and realized that the engine was putting out very little power. it was less than 10mph. my fuel ratio was 16 to one, which may be too rich, and the intake manifold gasket was torn apart. im pretty sure that the carb is functioning properly. i was just wondering all the possible reasons why i dont have power. The engine also has a hard time idling and will stall. i guess my main question is... could too much oil/small air leak cause the motor to not have any power/torque whatsoever?

what was interesting is that when i would pedal assist really hard, the rpms would go up and it was able to maintain a fairly high speed.

any thoughts are appreciated

Clotho · #2 02-22-2009, 06:46 AM

I would check a few things. First start with the plug. It isn't uncommon for them to become oil fouled during the break in period. If you are running the original Chinese one then you will want to change it for a NGK B5HS or B6HS. Sick Bike parts carries them if you need one. I would check the head bolts for tightness too.

After that I would check the intake and carb for leaks. I spray carb cleaner around the joints on mine and if the engine loses rpm I know I have a leak.

Rayzor · #3 02-22-2009, 10:29 AM

air leak somewhere?

**Bikeguy Joe** · #4 02-22-2009, 10:36 AM

Quote:

Originally Posted by forehead949

hey guys.
i recently started up my 80cc engine and realized that the engine was putting out very little power. it was less than 10mph. my fuel ratio was 16 to one, which may be too rich, and the intake manifold gasket was torn apart. im pretty sure that the carb is functioning properly. i was just wondering all the possible reasons why i dont have power. The engine also has a hard time idling and will stall. i guess my main question is... could too much oil/small air leak cause the motor to not have any power/torque whatsoever?

what was interesting is that when i would pedal assist really hard, the rpms would go up and it was able to maintain a fairly high speed.

any thoughts are appreciated

You have diagnosed your own problem....mix some fuel up at 24:1 and fix that gasket!

forehead949 · #5 02-22-2009, 02:55 PM

thanks guys.
about the spark plug. mine is a bit dark from the oil but it still sparks. could the oil residue greatly affect the power on this thing. cause when i forst started it up(when the plug was fresh) it was not any better.

meh?

im assuming it is a leak then. and my fuel is too rich.

**Bikeguy Joe** · #6 02-22-2009, 03:55 PM

Yes, yes, and ...... yes.

Technocyclist · #7 02-26-2009, 05:46 PM

air leak you say... check out the oil seals... repack the oil seals with grease...and seal the edges with a head gasket maker...

the oil seals tend to pop out...

forehead949 · #8 02-26-2009, 08:57 PM

oil seals?? lol wha do you mean?

Technocyclist · #9 02-27-2009, 03:09 AM

Quote:

Originally Posted by forehead949

oil seals?? lol wha do you mean?

The cranks have oil seals, a thin one on the left side or the magneto side, and a thick one on the right side or gear side.

**Bikeguy Joe** · #10 02-27-2009, 10:58 AM

Let us know what you find.