This is why you use billet rods


Well-Known Member
This was a brand new Honda gx200 that left the building at 6200rpm. It ruined a brand new Hilliard flame clutch and split the top of the block. Also ruined a new arc billet flywheel. So to all you guys pulling the governor outta your motors and thinking it’ll be fine without the proper components think again. 61EE676A-090C-410B-B46D-A913A5EC7CB2.jpeg 2C2BC828-526C-4870-9F56-CA6DB67B5390.jpeg 19D58924-7EFE-49AD-A05A-3F46B9106F70.jpeg FBC29940-5275-487D-B95B-2EFCED1F07CD.jpeg 14308C29-9CBB-40D9-851F-483111DA78CC.jpeg


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I know guys who used to race T/F Harley drag bikes , that got their ribs broken ect. during a run,, because they ride it basically laying over the top frame, & then something in the engine letting go ....


Active Member
Did they also upgrade the valve springs to allow it to rev higher than factory springs' valve float?

If so, that's everything except the crucial con-rod. Yikes.
Yeah, the engines we use are intended to run at 3600 RPM and aren't all that well balanced. You can get them to run a lot fastser, but you run the risk of, well, this. Good news is the parts for these engines are plentiful and not expensive. Now you have a fun project!

Rod breaks jams the crank stopping it suddenly and the inertia of the flywheel keeps it turning. Being it is a steel key not a shearable one like a mower has, the aluminum keyway in the flywheel which is softer gets smushed.
Did this have a aftermarket cam/springs? if so why on earth would anyone use a stock rod? I wouldn't see a problem takin a stock rod to short 5k rpm blasts but sustained rpm over that wouldn't be on my to do list.