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Old 04-18-2010, 09:03 PM
rcplaneman rcplaneman is offline
Motorized Bicycle Newbie
Join Date: Apr 2010
Location: blue ridge parkway in va
Posts: 2
Default hi im rc planeman from va

I have a new skyhawk 66cc on a new mtn bike done great for the first 10 trips now its kinda weak ??? anybody now whats up I changed the plug new gas no intake leaks runs 26mph on flat ground how do they act when its got a blown head gasget please help me im a newbee thank you
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Old 04-19-2010, 11:12 AM
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2door 2door is offline
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Join Date: Sep 2008
Location: Littleton, Colorado
Posts: 16,222
Default Re: hi im rc planeman from va

Welcome to the forum. Glad you've joined and hope we can offer some help.
If you suspect a blown head gasket check for signs of oil under the head. There should be visible evidence as well as poor performance. 26 mph isn't bad for an engine that isn't fully broken in. You didn't say how long your "trips" are but you'll need to burn through a couple to three gallons of fuel, varying your speed from WOT to a slow cruise during that time. What fuel mix ratio are you running? 24:1 is okay to start but I like to see that reduced to 32:1 after a couple of tanks. What spark plug and what is the gap? These little engines run better the more miles they accrue.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"

Last edited by 2door; 04-19-2010 at 11:15 AM.
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