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About to mount my Comet 780 but I don't know what size bolt to use. 3/8"fine thread is what most big blocks use. However I am only able to get 4 turns in and hit resistance. Up to that point the bolt runs in fairly smooth Can anyone verify what the correct bolt is for a gx620 is before I...

Not sure where this post belongs. Getting one of these very cheep. Cant find any specs on the tc setup. Looks like a yamaha mx360 engine. Very sililar to honda gx340. Cant tell what tc setup is in it. Or how the gearbox mates to the rear end or any of the gear ratios. Anyhow any help would...

How come there isnt better info on power gained from specific improvements? I understand the car world has 100x the people and money in the hobby. But it seems as if nobody has ever put one of these motors on a dyno.( i know thats not true just seems that way.) Tired of all these youtube...

As the title says anyone use this cam? http://www.nrracing.com/product-p/390clonecamshaft460.htm I called up there but didnt get much info on the cam other than he said you have to run stock springs. 420 is going in a larger cart. Going to do intake and exhaust and this cam. Machine is...

Been watching for a long time thought i would join. Currently have a baja minibike waiting for motor swap, a blister scorpion with a 6hp tecumseh, and just picked up a manco super duece ( no motor) for 250$. Info on these is hard to find. Looks like the imput shaft is broke and the company is...