Venturous Randy Posted July 30, 2007 #1 Posted July 30, 2007 The bore and stroke on a 1200 is 76mm X 66mm. What is a 1300? I spent the evening taking the 1300 engine apart that I have had for a long time and it don't look too good. I knew it probably had some rust in the bores because it had been left out in the rain uncovered for a while and it was froze up. I split the case and ended up taking the crank out so I could hammer the pistons to the bottom of the bore and clean the cylinder walls some before knocking them out. It looks like if I am going to use this block I will have to bore it and go with bigger pistons. I really don't think this is what I want to do. RandyA
Rocket Posted July 30, 2007 #2 Posted July 30, 2007 It looks like if I am going to use this block I will have to bore it and go with bigger pistons. I really don't think this is what I want to do. RandyA Another possibility is to re-sleeve the engine, I have seen them on ebay a few weeks ago, under a different search. As the company that makes the big bore kits, made the sleeves.
Squidley Posted July 30, 2007 #3 Posted July 30, 2007 I have heard that you can punch this V4 out to 1600 cc's, but I dont know how thin that would make the cooling walls on it. Can you imagine the power from a 1600 cc Venture
Squeeze Posted July 30, 2007 #4 Posted July 30, 2007 Hi, the Bore of a 1300 cc Engine is 79 mm. There is no need to give the Sleeves a bigger Bore. Just hone them and bring the old Pistons in with new Rings. Of Course, only if the Rust isn't to deep in the Sleeves. If you want to go for bigger Borings, with standard Crankshaft, 1500cc is somehow Standard on these Engines. There are also 1420cc Kits. But, if going to bore anyways, why should you go the half Way through ? You could expect some 160 to 170 hp on the Clutch with 1500cc and proper setted Carbs and some Exhaust-Mods. This is with Vmax Heads and Cams. A Guy i know, is working on a Vmax 1870 cc Engine. This Borings makes the Sleeves outside the Casing, but with special milled Bridges on the Side of the Casing that isn't the Problem at all. I've ridden a 1500cc Vmax with Injection, some 165 hp at the rear Wheel. I can tell you, that's Kind of Scaring, because you really need to think about whether giving full Throttle or not .... I decided only to do so if i have at least half a Mile straight and free to go... and, you should learn to shift 200 Percent faster than you're used to.
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