90 3pg won't rev up

49ford · 11-01-2018, 06:51 AM

compression is 120. Note, compression gauges go bad, I had to buy a new one to get a reading on this motor. Will pull exhaust later to check piston. Motor hasn't been apart as far as I know.

CP241 · 11-01-2018, 07:24 AM

You said you replaced the carb... dis you replace it with an OEM carb or a cheap aftermarket. Search the forum and you'll lose count of how many people were chasing their tails because their cart was running horribly rich (or lean) because of a cheap carb. Once they cleaned the OEM one out real good, it would run good as new.

trig123 · 11-01-2018, 09:57 AM

What does the spark plug look like ? Is it dry or gas fouled ?

49ford · 11-02-2018, 07:32 AM

I got a $17 carb and plug is near black

CP241 · 11-02-2018, 08:55 AM

Sounds like too much fuel. Do you still have the OEM carb? If so, clean it good and try that. You may be surprised

49ford · 11-02-2018, 10:28 AM

yes, I've cleaned it once, but I'll use the sonic cleaner and the solvents and air on it this time, along with checking the float measurements.

trig123 · 11-02-2018, 12:53 PM

Did you try it with the muffler disconnected ?

49ford · 11-02-2018, 02:08 PM

Yes, muffler off. I checked both carbs for float specs. Old one was out, new one right. Reinstalled old carb and it spun up well, and loudly with muffler off. Need to set timing but am much happier with motor now.

49ford · 11-05-2018, 07:33 AM

I'm done. The cart runs good. Upshot, don't buy cheap carbs. I set the float right on old carb and it rev'd up. I have a couple of hints for timing these. Take the fan housing off and leave it off while timing. I didn't and used the IG mark on housing as a timing mark. Wrong. Two, leave the plastic fan on the flywheel. Three, find and use the best puller you can find, as the initial removal was awful. It doesn't help to use heat to remove flywheel, it just costs you a pulser.

CP241 · 11-05-2018, 07:47 AM

I hear the sound of another Chinese carb hitting the trash can from here :) glad you got it sorted out. Enjoy!

11-01-2018, 06:51 AM	#11
49ford Gone Wild Join Date: Nov 2011 Location: SW MO Posts: 265	Re: 90 3pg won't rev up compression is 120. Note, compression gauges go bad, I had to buy a new one to get a reading on this motor. Will pull exhaust later to check piston. Motor hasn't been apart as far as I know.

11-01-2018, 07:24 AM	#12
CP241 Nincompoop village idiot Join Date: Apr 2018 Location: Michigan Posts: 9,690	Re: 90 3pg won't rev up You said you replaced the carb... dis you replace it with an OEM carb or a cheap aftermarket. Search the forum and you'll lose count of how many people were chasing their tails because their cart was running horribly rich (or lean) because of a cheap carb. Once they cleaned the OEM one out real good, it would run good as new.

11-01-2018, 09:57 AM	#13
trig123 Vintage tech Join Date: Sep 2009 Location: South Posts: 3,216	Re: 90 3pg won't rev up What does the spark plug look like ? Is it dry or gas fouled ?

11-02-2018, 07:32 AM	#14
49ford Gone Wild Join Date: Nov 2011 Location: SW MO Posts: 265	Re: 90 3pg won't rev up I got a $17 carb and plug is near black

11-02-2018, 08:55 AM	#15
CP241 Nincompoop village idiot Join Date: Apr 2018 Location: Michigan Posts: 9,690	Re: 90 3pg won't rev up Sounds like too much fuel. Do you still have the OEM carb? If so, clean it good and try that. You may be surprised

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11-02-2018, 10:28 AM	#16
49ford Gone Wild Join Date: Nov 2011 Location: SW MO Posts: 265	Re: 90 3pg won't rev up yes, I've cleaned it once, but I'll use the sonic cleaner and the solvents and air on it this time, along with checking the float measurements.

11-02-2018, 12:53 PM	#17
trig123 Vintage tech Join Date: Sep 2009 Location: South Posts: 3,216	Re: 90 3pg won't rev up Did you try it with the muffler disconnected ?

11-02-2018, 02:08 PM	#18
49ford Gone Wild Join Date: Nov 2011 Location: SW MO Posts: 265	Re: 90 3pg won't rev up Yes, muffler off. I checked both carbs for float specs. Old one was out, new one right. Reinstalled old carb and it spun up well, and loudly with muffler off. Need to set timing but am much happier with motor now.

11-05-2018, 07:33 AM	#19
49ford Gone Wild Join Date: Nov 2011 Location: SW MO Posts: 265	Re: 90 3pg won't rev up I'm done. The cart runs good. Upshot, don't buy cheap carbs. I set the float right on old carb and it rev'd up. I have a couple of hints for timing these. Take the fan housing off and leave it off while timing. I didn't and used the IG mark on housing as a timing mark. Wrong. Two, leave the plastic fan on the flywheel. Three, find and use the best puller you can find, as the initial removal was awful. It doesn't help to use heat to remove flywheel, it just costs you a pulser.

11-05-2018, 07:47 AM	#20
CP241 Nincompoop village idiot Join Date: Apr 2018 Location: Michigan Posts: 9,690	Re: 90 3pg won't rev up I hear the sound of another Chinese carb hitting the trash can from here :) glad you got it sorted out. Enjoy!