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Old 02-28-2010, 04:28 PM   #1
Tontito
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Need Help with JR50

I just bought my daughter an '05 JR50 2 stroke. The people that sold it to me said that it had been sitting for a year or two since their kids out grew it. I'm having a problem getting it to stay rev'ed up. It rev's fine when in Neutral, but when I put it in gear, it'll rev up, but if I keep the throttle pinned, it starts to die off. Can anyone give me any advise on why it might be doing this?

Thing's I've already done...
Fresh oil this week
Brand new spark plug gapped to spec (.60-.70)
Pulled carb and cleaned (also cleaned pilot jet)
Messed with the carb adjustments to get it to idle nice and smooth
Gas - it had a full tank in it when I bought it, but have no idea when it was put in.

Any idea what might be wrong? Things to try next?
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Old 02-28-2010, 04:39 PM   #2
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flywheel rusty? maybe not getting good spark. auto clutch worn out or not tensioned right?
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Old 02-28-2010, 05:49 PM   #3
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Correction - I just went out and messed with it a little and it also rev's and starts to die in Neutral too. If I chop the throttle it rev's and runs like a champ, but if I keep the throttle pinned, it starts to die out.

How would I know if it's not getting a good spark? The manual just says to put the spark plug up against the engine while giving it a kick to check if there is a spark - it definitely has a spark during that test.
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Old 02-28-2010, 08:12 PM   #4
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maybe the cdi box, or rev box is going bad on it. check out the flywheel and see what kinda shape its in. maybe the spark is too weak and its not burning all the fuel. are you sure the carb is good? is the needle bent or the float bad on it?
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Old 02-28-2010, 08:13 PM   #5
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Carb adjustment and or valve adjustment????
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Old 02-28-2010, 09:22 PM   #6
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no valves on the 2 stroke
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Old 02-28-2010, 09:39 PM   #7
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Sounds like its getting just enough fuel to rev it up but not to maintain it. The carb is probably varnished from sitting up too long.
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Old 03-01-2010, 09:03 AM   #8
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Thanks for some suggestions guys. I guess I'll start checking a few of these things out. I can't gaurantee the carb is good, so I'll plan to pull it off again and just order a re-build kit for it to see if it helps.

Thanks fellas!
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Old 03-02-2010, 01:42 AM   #9
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Mine did the same thing. To lean up top. Bigger main or add a bit of foam to air cleaner. I did both (not at same time) and ran like a champ.

Keep us posted.
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