little power

[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

 

[Clotho]

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]

air leak somewhere?

 

[Bikeguy Joe]

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]

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]

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

 

[Technocyclist]

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]

oil seals?? lol wha do you mean?

 

[Technocyclist]

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]

Let us know what you find.

 

[forehead949]

hey guys. i have been busy but thanks for the help. my bike is going around 25mph ish. im prety happy about it. no big problems right now

 

[justthisguy1292]

where are these gaskets and how do i tell if there is a leak? i crashed a little bit after losing traction in some sand and i've lost a bit of power. nothing seemed to be damaged cuz i took most of the beating. i used to be able to get to 30mph pretty easily but now it struggles to hold 24. i've tightened the head bolts, cleaned out carbon deposits, taken apart the carb and cleaned it a little bit and nothing helps. i'm pretty stumped. I think i'm using a 16:1 ratio for gas but that worked fine before the crash. I've put about 150 miles on it.

 

[forehead949]

hey man. im new to this so dont rely on me. i have been told to bump up he gasoline ratio after break-in from 16:1 to around 25:1. i bet you would get more power if you have less oil. and check your intake manafold gasket and all your seals in the carb for leaks.
thats my two cents

 

[forehead949]

oh and i just picked up some gasket material at home depot cause the ones that it came with sucked

 

[CrazyWhiteKidCycles]

ok, fix that gasket!! check that plug i.e. looseness..fouling...ect and mix a leaner fuel batch hope it helps
C.W.K

 

[Bikeguy Joe]

Make sure the engine is still lined up correctly too, could be the cause.

 

[WANGERS88]

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...

hay mate this is happening 2 my bike do u have 2 pull motor apart or can u do it by just taking magnet off any pics would b handy thank u

 

[Cabinfever1977]

fix the gaskets and seal everything up,its not the plug or oil/gas ratio but you should up it to 25:1 now.
plus something could have got damaged from the crash,check throttle and clutch cables.

 

[Technocyclist]

hay mate this is happening 2 my bike do u have 2 pull motor apart or can u do it by just taking magnet off any pics would b handy thank u

You don't have to pull the motor apart but you do have to remove the magnet and the small sprocket. Be careful not to loose the halfmoon woodruff. If you ignore this problem, there's a possibility that the oil seal can get eaten up by the small gear. Also, the oil would spread to your clutch, rendering it useless. Unless your engined seized up first. It's a bit tricky putting back the magnet. Takes some practice and patience.

 

[WANGERS88]

thanks only magnet side leaking
woodruf key have worked with them be 4 know a few tricks all back together now
used seal from 1 of my motors where wrist bearing disintegrated