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Old 03-12-2007, 09:38 AM
guytimes's Avatar
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Default 2001 CR125 starting hard

I bought a 2001 CR125 a few months ago. The guy I bought it from told me the piston had been changed about 6mo before that, with not a lot of time on it.

The bike has always started on the first few kicks, until about a month ago I let a friend ride it. He rode it around like it was a trail bike (never wound it up) and ended up fouling a plug. I put in a new plug, but ever since, it seems to start a lot harder now. Once it's started it seems to run fine.

When the engine is cold, it still starts up fine on the first few kicks, but when it's hot, it doesn't want to start. In order to get it started, I have to open the throttle all the way, and then it starts on the second kick. (A friend gave me this tip, not sure why it works?)

What could be wrong? Not sure if the friend riding it like my grandma has anything to do with it? Maybe it's time for a new piston? A buddy of mine says I need to adjust the jetting?

Any advice would be appreciated.
Thanks
Tom
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Old 03-12-2007, 10:06 AM
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Default Re: 2001 CR125 starting hard

Throttle full on is how I always start a warm two stroke.
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Old 03-12-2007, 10:12 AM
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Default Re: 2001 CR125 starting hard

Quote:
Originally Posted by ossagp1 View Post
Throttle full on is how I always start a warm two stroke.
Hmmm, why does that work? Seems like it would flood the cylinder with gas and foul the plug? I'm a newbee... so still learning this stuff.

Thanks for the quick reply
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Old 03-12-2007, 01:08 PM
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Default Re: 2001 CR125 starting hard

Has the carb ever had a good cleaning?
To me it sounds like a carb or intake problem, check the reeds and all the intake seals and clean the carb out.

When was the last time you cleaned your air filter?
The Air filter should be cleaned after every ride.
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Old 03-12-2007, 01:31 PM
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Default Re: 2001 CR125 starting hard

Have not cleaned out the carb, but I will give it a shot. Air filter was just replaced.
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Old 03-12-2007, 04:39 PM
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Default Re: 2001 CR125 starting hard

Quote:
Originally Posted by ossagp1 View Post
Throttle full on is how I always start a warm two stroke.
This is how i always start my 2-strokes too. When it's cold, I use the choke and no throttle. When hot, I use full throttle and no choke. It sounds like you don't have a problem.
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Old 03-13-2007, 01:22 AM
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Default Re: 2001 CR125 starting hard

You guys are liable to be suprised at how infrequently I clean an air filter when the bike is not being ridden in heavy dust. (If it looks dirty is is, though.)

Glad you asked the question on flooding and if you are not giving the engine lots of gas buy holding the throttle open: Take a look down your carburetor and roll the throttle open. See any gas coming out or squirting on your two stroke? You are giving your engine AIR in this case. No fuel is delivered until there is vacuum. With the trottle held open, vacuum will be low until some pretty high rpms are achieved. Air is what yours needs when it is hot. The same drill when cold will result in you getting warm way before the engine does.

You may have stumbled onto a tuning problem with the help of your slug riding friend. The float may need adjustment. It is a maitenance item, and wont be noticed as much by someone who keeps the engine singing (particularly if that person doesn't know the problem exists.)
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Old 03-13-2007, 11:19 AM
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Default Re: 2001 CR125 starting hard

Slug riding friend!!

Thanks Ossa, I needed that AND the reasoning as to why the throttle wide open works!

Slug riding friend
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Old 03-13-2007, 03:32 PM
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Default Re: 2001 CR125 starting hard

Heck George, to prove it, he even included a picture of the guy.
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