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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles



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Unread 10-12-2009, 08:19 PM   #1
Not Yet Wild
Yamaha
 
Join Date: Oct 2009
Location: Kosciusko, Ms
Posts: 13
Default Losing R.P.M

I have a G2 gas burner. Recently when driving at top speed R.P.M. started going up and down when petal was held to the floor. This is not continuous. R.P.M. goes up and down. If you hold throttle 1/2 way it does fine. If pushed to the floor it goes up and then down. Please help!!
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Unread 10-12-2009, 08:56 PM   #2
Gone Wild
 
DOOmsman's Avatar
Yamaha
 
Join Date: Jul 2008
Location: Reddick IL
Posts: 10,985
Default Re: Losing R.P.M

Goveneor?-
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Unread 10-12-2009, 09:07 PM   #3
Not Yet Wild
Yamaha
 
Join Date: Oct 2009
Location: Kosciusko, Ms
Posts: 13
Default Re: Losing R.P.M

Yes the govenor is still connected. I have seen some post where oil in the air filter will cause this. I do have oil in my air filter. I am just curious to why it has just started doing this. I just bought the cart, but knew the previous owner he had no problems with this at all.
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Unread 10-12-2009, 09:12 PM   #4
Gone Crazy
 
Join Date: Jan 2007
Location: Chesterfield, Va
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Default Re: Losing R.P.M

Make sure the oil level is correct and not over filled. Dirty carb will also surge the rpm in a lean condition (high speed jet gumed or partial restriction.
Pull it, tear it down and give it a good soak in carb cleaner.
Replace the filter, they are not washable.
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Unread 10-12-2009, 09:15 PM   #5
Not Yet Wild
Yamaha
 
Join Date: Oct 2009
Location: Kosciusko, Ms
Posts: 13
Default Re: Losing R.P.M

I have seen some pics witht K&N air filters where they have gottne rid of the air filter box. Is this something that will improve this.
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Unread 10-12-2009, 09:18 PM   #6
Gone Crazy
 
Join Date: Jan 2007
Location: Chesterfield, Va
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Default Re: Losing R.P.M

Not without rejetting the carb and updating the exhaust system.
Yamaha's are kinda funny about not running right without the stock air box sealed properly and a good filter in it.
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Unread 10-12-2009, 09:43 PM   #7
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Yamaha
 
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,322
Default Re: Losing R.P.M

Quote:
Originally Posted by Country Boy View Post
I have a G2 gas burner. Recently when driving at top speed R.P.M. started going up and down when petal was held to the floor. This is not continuous. R.P.M. goes up and down. If you hold throttle 1/2 way it does fine. If pushed to the floor it goes up and then down. Please help!!
You may think I'm crazy...Take the primary clutch cap off and check for a broken weight/link.
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Unread 10-12-2009, 10:54 PM   #8
Gone Wild
 
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Yamaha
 
Join Date: Jun 2009
Location: ozarks
Posts: 237
Default Re: Losing R.P.M

doesn't the G2 have a rev limiter built into the ignition box?
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Unread 10-16-2009, 11:06 AM   #9
Not Yet Wild
Yamaha
 
Join Date: Oct 2009
Location: Kosciusko, Ms
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Default Re: Losing R.P.M

What brand oil do I need to use and how much does it take.
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Unread 10-16-2009, 11:30 AM   #10
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Yamaha
 
Join Date: Dec 2006
Location: Ohio
Posts: 15,910
Default Re: Losing R.P.M

Any good quality motor oil will be fine, 1 quart.

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