G21 help.

Cdebo1 · 04-10-2015, 07:10 PM

Ok guys I need the brains. I just picked up a 2002 g21 compression was good @ 120 and cart runs. But there are a few issues. Orignal when purchased the cart you would push the accelarator and it would jump to life but run at a whopping 6mph. I just tried a quick fix and cranked down the govner a bit and it helped but not much. Now it kinda bucks when lightly depressing the pedel then will get up around maybe 8mph. At full accelarator. So the question is where to start. The mounts look good no slop in the motor not sure how to check anything else any guidance would be helpful. Also not sure what motor it has is there a plate anywhere to help me identify. I know that the GODS here can help

cgtech · 04-10-2015, 07:54 PM

Check clutches for slop, check belt width (should be riding at very top of rear pulley when at rest). Check for full throttle at carb when pedal is pressed all the way (can be checked with key off).

Cdebo1 · 04-10-2015, 08:19 PM

Where would I be looking for clutch slop (I'm mean obviously the clutch ) but up down side to side....in between the plates? I imagine that it should tighten as the engine spools? new to the gas world. So sorry for the noob questions. Going to check all cables tomorrow in the am but having a hard time funding a new accel to govner cable for the g21 do they share parts with another model?

cgtech · 04-10-2015, 08:52 PM

G21 prob has its own cable (its a longer frame). Front clutch- grab gold cap, push up & down vertically, should be very little "rocking" movement. Remove gold cap, inspect 3 rollers for flat spots (likely will find some, if so replace all 3 rollers, never one at a time). Rear clutch- with belt removed, twist sliding sheave against spring (google "yamaha sliding sheave") just enough to twist sheave off spring seat (or helix in CC & ezgo terms), then press towards transmission with thumb at top, the whole thing should move evenly towards the transmission, not just the top where your thumb is (indicates worn bushing). Best part of yamaha clutches is you can buy just the parts you need, not "whole clutch" like CC & ezgo. Sorry if this is hard to understand, its much easier to show someone than type it out.

Cdebo1 · 04-10-2015, 09:02 PM

Thanks. I think I get it. I will check it out tomorrow and post results. As far as the govner goes I see some people say cram it all the way down and some say never ever thoughts?

raydhd · 04-10-2015, 09:13 PM

Quote:

Originally Posted by Cdebo1

Ok guys I need the brains. I just picked up a 2002 g21 compression was good @ 120 and cart runs. But there are a few issues. Orignal when purchased the cart you would push the accelarator and it would jump to life but run at a whopping 6mph. I just tried a quick fix and cranked down the govner a bit and it helped but not much. Now it kinda bucks when lightly depressing the pedel then will get up around maybe 8mph. At full accelarator. So the question is where to start. The mounts look good no slop in the motor not sure how to check anything else any guidance would be helpful. Also not sure what motor it has is there a plate anywhere to help me identify. I know that the GODS here can help

Isn't 120 psi awful low on compression test?

Cdebo1 · 04-10-2015, 10:13 PM

Quote:

Originally Posted by raydhd

Isn't 120 psi awful low on compression test?

I was told by others on the site that this motor should be somewhere within the 117 tp 120 range. For stock 301/357

Cdebo1 · 04-11-2015, 07:41 AM

Hey thanks for the help. So quick morning inspection i find a few flaws. 1. No GOLD CAP on clutch (I assume not a big deal but helps keep things out of the sheave) 2. I am totally missing a Weight and roller assembly gone not even there (could this cause some of the issues?) I assume that these rollers and weights to move the clutch? 3. The 2 rollers left are full of flat spots. I am thinking i will start with replacing all three rollers and see where that goes. Thoughts? Also if any one can confirm that the G21 compression should be in the 120 range?

raydhd · 04-11-2015, 07:44 AM

Quote:

Originally Posted by Cdebo1

I was told by others on the site that this motor should be somewhere within the 117 tp 120 range. For stock 301/357

Don't have a manual for g21 but do for g16,g20 is 142-164, g14 is 142-178.

raydhd · 04-11-2015, 07:53 AM

Other thoughts, did you adjust the valves first? Did you try the test again after oiling the cylinder? My badly smoking g14 read 125 then 140 oiled.

04-10-2015, 07:54 PM	#2
cgtech Over This Interview Is... Join Date: Jun 2012 Location: AZ Posts: 17,449	Re: G21 help. Check clutches for slop, check belt width (should be riding at very top of rear pulley when at rest). Check for full throttle at carb when pedal is pressed all the way (can be checked with key off).

04-10-2015, 08:19 PM	#3
Cdebo1 Getting Wild Join Date: Apr 2014 Location: Florida Posts: 129	Re: G21 help. Where would I be looking for clutch slop (I'm mean obviously the clutch ) but up down side to side....in between the plates? I imagine that it should tighten as the engine spools? new to the gas world. So sorry for the noob questions. Going to check all cables tomorrow in the am but having a hard time funding a new accel to govner cable for the g21 do they share parts with another model?

04-10-2015, 08:52 PM	#4
cgtech Over This Interview Is... Join Date: Jun 2012 Location: AZ Posts: 17,449	Re: G21 help. G21 prob has its own cable (its a longer frame). Front clutch- grab gold cap, push up & down vertically, should be very little "rocking" movement. Remove gold cap, inspect 3 rollers for flat spots (likely will find some, if so replace all 3 rollers, never one at a time). Rear clutch- with belt removed, twist sliding sheave against spring (google "yamaha sliding sheave") just enough to twist sheave off spring seat (or helix in CC & ezgo terms), then press towards transmission with thumb at top, the whole thing should move evenly towards the transmission, not just the top where your thumb is (indicates worn bushing). Best part of yamaha clutches is you can buy just the parts you need, not "whole clutch" like CC & ezgo. Sorry if this is hard to understand, its much easier to show someone than type it out.

04-10-2015, 09:02 PM	#5
Cdebo1 Getting Wild Join Date: Apr 2014 Location: Florida Posts: 129	Re: G21 help. Thanks. I think I get it. I will check it out tomorrow and post results. As far as the govner goes I see some people say cram it all the way down and some say never ever thoughts?

04-11-2015, 07:41 AM	#8
Cdebo1 Getting Wild Join Date: Apr 2014 Location: Florida Posts: 129	Re: G21 help. Hey thanks for the help. So quick morning inspection i find a few flaws. 1. No GOLD CAP on clutch (I assume not a big deal but helps keep things out of the sheave) 2. I am totally missing a Weight and roller assembly gone not even there (could this cause some of the issues?) I assume that these rollers and weights to move the clutch? 3. The 2 rollers left are full of flat spots. I am thinking i will start with replacing all three rollers and see where that goes. Thoughts? Also if any one can confirm that the G21 compression should be in the 120 range?

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04-11-2015, 07:53 AM	#10
raydhd VC 460 CLONE GONE WILD Join Date: Oct 2014 Location: Ray BY The Bay NJ Posts: 10,633	Re: G21 help. Other thoughts, did you adjust the valves first? Did you try the test again after oiling the cylinder? My badly smoking g14 read 125 then 140 oiled.