This is why you use billet rods

Davis

Well-Known Member
#1
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
 

I74

Well-Known Member
#7
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 ....
 

Harquebus

Well-Known Member
#9
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.
 
#15
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!

Bumblebee
 
#17
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.
 
#20
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.
 
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