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O.k guys trying to get my new project up and going so i thought i would fill ul in a little. Its going to start with 92 sl650 hull then to the the engine. a new lowerend with new seals and trued welded crank with hotrod rods (thanks to beerdart). the topend is going be freshly bored 72mm with new wiseco pistons. going to be using a single layer head gasket to bump up the compression a little. the electrical is going to be 785 coils/cdi/electrical (all from beerdarts project) and also upgrading the 92 650 hull with a mfd. and for the exhaust il be going with some psi triple pipes. going with some 44mm 785 carbs on the fuel side which i think iam going to attempt to run my new triple outlet fuel pump with the 38mm backs/crossovers and for the pump iam going to be running a stock 785 impleller 12/17 and spacer (with short driveshaft) with a slx ride plate.
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ill fill in anything that i left off later and keep ul upadated. any thoughts and or suggestions will be greatly appreciated. especially on the fuel side. LOL. Iam sure ill have some questions il need answered in several areas of this project so keep ur eye out for me. LOL -
What heads are you going to be using? Stock bore 780 heads on a 72mm (.75mm OS) will cause problems.
You may have contact issues, and your compression will be higher because of the oversized pistons.
Why are you trying to run a triple outlet fuel pump? (I hope it's the H.O. pentagon pump at least)
I'll tell you right now, that 12/17 impeller is going to be too small for thet set up. Those pipes like to be run around 6900 RPM.
I was turning about 7100 with a 15/20 and that same set up. Even Keddano's triple pipes 750 had a 14/19 on it....My ski says made in the U.S.A...... Can yours say that???Comment
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well ive decided agianst using the triple fuel pump. iam just going to drill the reed spacer and add a pulse line.Comment
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o.k so what would be a good impeller to use? i was going with the 785 12/17 cause they run what is it around 140hp with triples so i fiugerd it should work out pretty good.Comment
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sounds like a deal on the spacer pm sent.
ul think i should try the stock 4 blade impeller or the 12/17 before getting something diff? or just ditch them both and try to get another? i dont mind buying the right one if someone can get me close on which one i need. i just aint got the cash to be buying several diff impellers.Comment
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and does anyone got any suggestions on were to start with jets? i think i got 97 44mm carbs.Comment
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PM sent about the reed spacer.
I'd start with the 15/20 first. If my tachometer was right, I was turning nearly 7300 RPM with that set up. You can always have the impeller rebent 1* up or down if need be.
How good is that 12/17? You may be able to sell it to pay for the new one you need.
As for jetting, look and see what Starflight was using on his project. Sounds like he was pretty close to being dialed in. (good starting point I suppose)
And how about the heads? What are you doing with those?My ski says made in the U.S.A...... Can yours say that???Comment
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still debating on what to do with the heads. may just send my stock ones off to get reworked. any suggestions?Comment
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That's not a bad idea. The boys at Sharps can hook you up for around $40 ea.
Also have my OP head for sale. It's already bored for 72mm and comes with an assortment of gaskets to achieve the proper squish clearance.My ski says made in the U.S.A...... Can yours say that???Comment
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would .006" be good for clearance on the wisecos? what should my ring gap be?Comment
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It's normally suggested to be around 6 1/2 - 7 thousandths piston clearance with Wiseco.
My rings were gapped at 16 thou. Stock calls between 12 - 18 thou.My ski says made in the U.S.A...... Can yours say that???Comment
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Man xlint no one else must like me. Lol. Thanks for ur help. Hopefully il be getn the OP head from u in a few days. Beerdarts hookn me up with some base/intake gaskets so hopefuly i can get some work done to it soon. Anyone got any extra exhaust springs layn around they dnt want? Iam misn a couple.Comment
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