Sunl 110cc wont start - ATV Enthusiast Community

1) Engine problems.. If your quad wont in here.

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Old 04-05-2010, 06:27 AM
Weekend Warrior
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Join Date: Apr 2010
Posts: 5
Exclamation Sunl 110cc wont start

My kid was out riding it and it quit. I noticed that it would roll over way to easy and found that it had no compression. I have it tore apart and found nothing wrong. Valves, piston, and rings all look good. I am thinking that the timing is off, I had an older bike and it did this once when I jumped it hard. Any help would be great we are planning to head north this weekend and would like to get it going. Thanks
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Old 04-05-2010, 09:11 AM
Pro Rider
Join Date: Sep 2005
Location: AB, Canada
Posts: 590

When you say no compression did you put a gauge on or what? Those engines are like the old honda 110 engines when setting valve timing. Mark on the fly wheel lines up with the mark on sproket on the camshaft I would think.

In the past many have used these manuals for the 50 to 110cc chinese engines.

Clymer M310-13 Honda 50 - 110cc OHC Motorcycle Shop Service Repair Manual
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Old 04-05-2010, 10:43 AM
Weekend Warrior
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Join Date: Apr 2010
Posts: 5

I can hold my thumb over it now. Isnt there anything online that would show me how to do it? Dont realy have the money right now to do any thing but let the kid ride it. Thanks
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Old 04-16-2010, 07:11 AM
mywifesquad's Avatar
KTM Patrol
Former Chinese POW!
Join Date: Jul 2004
Location: Newman, Ca
Posts: 58,347

Welcome to the forum SPARKY69!

Have you ever checked the valve clearance?
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Old 04-17-2010, 04:36 PM
Weekend Warrior
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Join Date: Apr 2010
Posts: 5

Thanks I ended up finding a bent exhaust valve. New valves on the way! Hope that fixes the problem and were up and running by next weekend.
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