Yamaha rev limiter

Henrykit10 · 06-08-2023, 02:01 PM

I am having problems with my Yamaha G2. It keeps surging. I would like to know at what revs the rev limiter cuts in and should the ignition advance at higher revs, mine doesn't. I found a document which states an advance of 30mm at 2500 revs as measured with ref to TDC.
Thank you for any replies

CP241 · 06-08-2023, 05:18 PM

With stock tires the rev limiter shouldn’t hit until you’re over 20mph. You’ll know it because it won’t surge, it will just stop and completely shut the engine off until you slow a bit and then it’ll start running again.

Surging is likely either a carb issue, or a clutch issue.

Henrykit10 · 06-11-2023, 10:57 AM

Thank you I have cleaned the carb out completely and run the buggy over rich and lean I have also checked the primary clutch but all the weights are sound all to no effect. That is why I wondered if the ignition should advance and retard which it isn't.

CP241 · 06-11-2023, 06:22 PM

Secondary clutch often will cause surging type problems. Can also cause you to bounce off the rev limiter at low speeds due to gearing

Henrykit10 · 06-12-2023, 02:40 PM

Thank you for your replies I will investigate on my return from a short break. It shouldn't be this difficult, I thought I was a reasonable amateur engineer.

smallblock450sl · 06-12-2023, 03:02 PM

A cheap, less then 10.00 "Dynamic spark tester" will show you if the spark is really cutting out causing the an ignition problem.

Henrykit10 · 06-13-2023, 01:31 AM

Thanks for the thought, I have checked it ok whilst stationary but will get a tester with longer leads so I can see whats happening whilst being driven.

06-08-2023, 02:01 PM	#1
Henrykit10 Not Yet Wild Join Date: Jul 2020 Location: london Posts: 9	Yamaha rev limiter I am having problems with my Yamaha G2. It keeps surging. I would like to know at what revs the rev limiter cuts in and should the ignition advance at higher revs, mine doesn't. I found a document which states an advance of 30mm at 2500 revs as measured with ref to TDC. Thank you for any replies

06-08-2023, 05:18 PM	#2
CP241 Nincompoop village idiot Join Date: Apr 2018 Location: Michigan Posts: 9,690	Re: Yamaha rev limiter With stock tires the rev limiter shouldn’t hit until you’re over 20mph. You’ll know it because it won’t surge, it will just stop and completely shut the engine off until you slow a bit and then it’ll start running again. Surging is likely either a carb issue, or a clutch issue.

06-11-2023, 10:57 AM	#3
Henrykit10 Not Yet Wild Join Date: Jul 2020 Location: london Posts: 9	Re: Yamaha rev limiter Thank you I have cleaned the carb out completely and run the buggy over rich and lean I have also checked the primary clutch but all the weights are sound all to no effect. That is why I wondered if the ignition should advance and retard which it isn't.

06-11-2023, 06:22 PM	#4
CP241 Nincompoop village idiot Join Date: Apr 2018 Location: Michigan Posts: 9,690	Re: Yamaha rev limiter Secondary clutch often will cause surging type problems. Can also cause you to bounce off the rev limiter at low speeds due to gearing

06-12-2023, 02:40 PM	#5
Henrykit10 Not Yet Wild Join Date: Jul 2020 Location: london Posts: 9	Re: Yamaha rev limiter Thank you for your replies I will investigate on my return from a short break. It shouldn't be this difficult, I thought I was a reasonable amateur engineer.

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06-12-2023, 03:02 PM	#6
smallblock450sl Sometime's............ Join Date: Oct 2007 Location: Tacoma Washington Posts: 11,875	Re: Yamaha rev limiter A cheap, less then 10.00 "Dynamic spark tester" will show you if the spark is really cutting out causing the an ignition problem.

06-13-2023, 01:31 AM	#7
Henrykit10 Not Yet Wild Join Date: Jul 2020 Location: london Posts: 9	Re: Yamaha rev limiter Thanks for the thought, I have checked it ok whilst stationary but will get a tester with longer leads so I can see whats happening whilst being driven.

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