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ATV Riders Forum > Sport ATV Model Information > Suzuki LT250R QuadRacer ATV Info > Revving on its own & not shutting down?

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Turf-Terminator
Junior Member

Registered: Nov 2009
Location: Maine
Posts: 2

Revving on its own & not shutting down?

I’ve rebuilt a 87 LT250R, new piston & bore and new gaskets. While trying to break the engine in (I would run it for a few minutes and let it cool, I didn’t go right out and crank on it). At an idle the engine started to rev on its own, pretty near full throttle. When I hit the kill switch it remained running, so I pulled off the sparkplug cap, nothing happened. I ended up stalling it by giving it throttle and stalling it. While it was revving steam was blowing out of the overflow tube on the radiator. I am told that this is called “dieseling”. Caused by any engine getting too hot then on its own. Any ideas on why it would rev up and not shut down. I am thinking the reeds may be damaged. I have not opened it up to examine yet… too discouraged.

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11-19-2009 07:14 PM

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fx4pitrone
Senior Member

Registered: Sep 2008
Location: CT
Posts: 156

Was the engine leak tested? If there is a leak, it will suck air in and cause an uncontrollable rev... it can be scary!! Does it have fuel? LOL never know, but when running out of fuel, it will lean out and idle high....
When it gets revving like that, the piston is so hot, that even when you kill the spark, the fuel continues to ignite, causing it to continue to run... pull the clutch and kick it in gear w/ brake on....

Chances are an air leak... I would presure test the engine or have it done....

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11-19-2009 10:31 PM

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Turf-Terminator
Junior Member

Registered: Nov 2009
Location: Maine
Posts: 2

Thanks for the quick answer. I haven’t pressure checked the engine, a friend of mine who had an ‘88 seems to think I’m sucking air between the cylinder and bottom end, (directly below the reeds). If I run a small bead of silicone in this area do you this will hold?

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11-20-2009 02:55 AM

fx4pitrone
Senior Member

Registered: Sep 2008
Location: CT
Posts: 156

My zilla had a leak in that same spot.... Was the gasket replaced?

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11-20-2009 05:14 AM

tommygunnz
Member

Registered: Jul 2009
Location: Torrington CT
Posts: 82

One time my buddys 250R had a leak on the intake gasket it was revving high

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11-20-2009 05:47 AM

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