spud 10 Posted February 10 (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 by spud add price 3 Quote Share this post Link to post Share on other sites
homefire 2,550 Posted February 12 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 Share this post Link to post Share on other sites
homefire 2,550 Posted February 18 (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 by homefire Quote Share this post Link to post Share on other sites
Charlie Fox 6 Posted March 13 I like the concept. How loud is it? Quote Share this post Link to post Share on other sites
spud 10 Posted March 13 Sounds like lawn equiptment Quote Share this post Link to post Share on other sites
homefire 2,550 Posted March 16 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 Share this post Link to post Share on other sites
spud 10 Posted March 17 Thanks, Hopefully, someone can put this to use, I have a new hip and not taking any chances of falling Quote Share this post Link to post Share on other sites
