spud Posted February 10, 2019 Share Posted February 10, 2019 (edited) Gary Fisher mountain bike with a 49cc gas motor could be larger cc not sure, it's fast. This one will get you out in the hills and back $350.00 Edited February 10, 2019 by spud add price 2 Quote Link to comment Share on other sites More sharing options...
homefire Posted February 12, 2019 Share Posted February 12, 2019 Most of those Chines Engine are unmarked 66cc. Listed as 80cc the chines include the Combustion chamber in they're calculations. Pop that head off, Replace the Head Gasket and torque down . Is the ex-host port like 40mm or 32 ?? "" A good rule of thumb is to shoot for 8mm head bolts @ 120 to 140 inch pounds. For all other engine fasteners, 6mm, set your torque wrench to 60 to 80 inch pounds. Those values will keep you out of trouble. "" Replacement Parts can be had DIRT Cheap for the things. 1 Quote Link to comment Share on other sites More sharing options...
homefire Posted February 18, 2019 Share Posted February 18, 2019 (edited) There are like three versions of piston they use in those things. This one is the most common. https://www.ebay.com/itm/47mm-66-80CC-Gas-Motorized-Bicycle-Bike-Engine-parts-1-1-16-type-B-Piston-KIT/191722418481?hash=item2ca38bf131:g:SLkAAOSwe-FU94~q:sc:USPSFirstClass!88030!US!-1:rk:1:pf:0 Edited February 18, 2019 by homefire Quote Link to comment Share on other sites More sharing options...
Charlie Fox Posted March 13, 2019 Share Posted March 13, 2019 I like the concept. How loud is it? Quote Link to comment Share on other sites More sharing options...
spud Posted March 13, 2019 Author Share Posted March 13, 2019 Sounds like lawn equiptment Quote Link to comment Share on other sites More sharing options...
homefire Posted March 16, 2019 Share Posted March 16, 2019 Actually you can get them to quiet right up. If Bike Berry Sells it , you can get it for half the price on E-Bay .. Quote Link to comment Share on other sites More sharing options...
spud Posted March 17, 2019 Author Share Posted March 17, 2019 Thanks, Hopefully, someone can put this to use, I have a new hip and not taking any chances of falling Quote Link to comment Share on other sites More sharing options...
spud Posted July 29, 2019 Author Share Posted July 29, 2019 sold 1 Quote Link to comment Share on other sites More sharing options...
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