squirrelman Posted December 7, 2017 Share Posted December 7, 2017 posted this @ http://vfrworld.com/threads/what-do-i-have-here.54567/#post-576927 i hoped and expected to buy a stock, running 750 engine but instead got this shipped in, not runnable as-is and needing work. first, a major disappointment, as right front cylinder compression means big trouble: so i pulled the front head and found some surprises ! special (mystery) high compression domed pistons CNC machined vs.oem cast pistons, fancy stuff ! a spot where the top of the piston hits the plug electrode at TDC is visible, the next big disappointment. stock piston for comparison: \ hot reground cam at right, stock is left: hot reground cam is marked "NFF" or "NFI". anyone know him ? .020" more lift than stock. porting and polishing by "R.E.D." he has a website and alot of rich-guy, big-boat, fast-lane endorsers : Edit nice work by a pro i discovered 2 very leaky intake valves on the right front cylinder, accounting for the low compression. my current theory is that new rings aren't seated (cylinders were not honed or cross-hatched) so running he engine for awhile might boost the compression up..........i hope. ^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^ from what little i think i know about building engines and some experience, my best guess is that this one would be a troublesome beast in a street bike, needing expensive race fuel and prone to bad idle and overheating. my challenge now is just to get it running, to test it out on the road a bit, then maybe sell it at some profit to a younger he-man multi-tattooed bloke who needs to go fasta than i dare, or maybe an AMA or ARHMA vintage racer with deep pockets and 70+, enjoying life in the elite atmosphere of the pits. if it don't blow apart, that is. Link to comment Share on other sites More sharing options...
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