Thread: 650 to 750 top end
12-13-2009, 11:48 PM #1
650 to 750 top end
How much would take to use my 650 crank case and convert the jugs and pistons to a 750 is it possible for that matter
12-13-2009, 11:58 PM #2
You would need:
12-14-2009, 12:04 AM #3
- Join Date
- Oct 2006
- Cleveland OH
You CANNOT bore 650 cyls out to fit 750 pistons.
The carbs will need to be rejetted, but you can EASILY convert a 650 to 750.
Matter of fact, I have 750 cyls and heads for sale. Also have some pistons if interested.
12-14-2009, 12:11 AM #4
I would not be comfortable putting a lot of money into your motor if it has rust on the crank bearings as you said in another thread! You dont want to throw out a crank bearing, lose a rod or two and wreck your new top end. BUT if you are going to do it anyways, I would talk to Xlint89, he has the parts you want and is a great guy to deal with.
12-14-2009, 12:13 AM #5
if anyone has the parts listed above pm me and we can negotiate ill have about 600 over xmas so hopefully we can strike a deal ALSO could i get my block machined and new bearings to get the rust out oh i wanna go performance ride plate and maybe performance impeller too i also need rods
maybe get everything polished and balaned eh
Last edited by katz1002; 12-14-2009 at 12:15 AM. Reason: spelling
12-14-2009, 12:17 AM #6
6 views and 5 post yall are wonderful people
12-14-2009, 12:18 AM #7
Alright. Slow down a little. Have you taken this engine apart yet? The bearings on the crank are not like a 4 stroke motors bearings. You dont generally 'machine' the crankcase and go with oversize bearings like you do with 4 stroke engines. The bearings used on these cranks are standard 6203 open bearings (and one 6307nr) that are pressed onto the multi piece crankshaft by a machinist. Rebuilding one requires special equipment. I would pull it out of the ski and pull the crank out if you suspect bearing damage. What lead you to believe there was rust in the crank?
12-14-2009, 12:26 AM #8
I have a nice 750 short block. just one thing is wrong with it, the 1 rod (pto) hangs up a little on the crank bearing but the rod is straight. you could get that repaired and be ready for jugs and pistons!. 150.00 It has the engine plate, the stator cover, stator on it already, wires are there all ready to be wired up. Crank spins awesome except for the one litlle hang up. see what the others think.
Yep! see that ski to your left? it's IN MY DRIVEWAY Now! It's here!!! woohoo!!
12-14-2009, 12:26 AM #9
have you seen my youtube video of the watery oil in the crank case and the rusty rods
12-14-2009, 12:30 AM #10
I had about a qt of that milky stuff in my 750sl. I put the motor in my slt. runs good!.
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