Buddy gave me 93 XP 650 with hole in bottom of case. I bought a used SBT rebuilt short block of unknown year the seller thought was a 650 but measuring the bore thru the exhaust port the bore is to large. Thinking it must be a 720. The top of head has 3 small coolant ports, 93 650 has 1 large and 1 small. Could I swap the top coolant jacket part of head from 650 to 720? They look similar. I plan on using the orginal dual carbs. They have ajustable low and high speed fuel mixture screws. Should I use a 720 rotary valve? The 650 has a 147 degree valve and needs replacement anyway.
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720 swap into 93XP 650
- Thread starter stap007
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mpem should be fine. 93 was a regular 650, if you swap the sator from the 650->720 it should be fine
find a manifold for a 720, the carbs are the same the jets and needles /pop off are different.
you'll also want the exhaust from a 720 2 piece one from the XP or SPX. find your parts from a 95XP or 96-97 SPX
there is a parts breaker up in Alexandria that might have some of your parts but if you found a SBT motor I think you'll find the parts you'll need
find a manifold for a 720, the carbs are the same the jets and needles /pop off are different.
you'll also want the exhaust from a 720 2 piece one from the XP or SPX. find your parts from a 95XP or 96-97 SPX
there is a parts breaker up in Alexandria that might have some of your parts but if you found a SBT motor I think you'll find the parts you'll need
720 swap to 93XP 650
The 720 is a bare long block. It looks like the 650. My plan is to swap the pto flywheel, sator housing, stator and flywheel. At first I thought I could swap the coolant cover from the 650 to 720 to solve the cooling system-hose hookup problem but internally they are different so that won't work. And can't swap the complete head. So you think if I get a 720 exhaust manifold and pipe I should be able to solve the cooling system hookup? The 650 rotary valve and intake manifold are chewed up anyway so I need to find those parts. The carbs. have adjusting screws for low and high speed fuel mixture , I didn't think was replaceable jets. I've never did any major work on a jetski before, so this is kind of a winter project for me. I do have three snowmobiles and know what can happen if a 2 stroke doesn't have the right fuel mixture.
The 720 is a bare long block. It looks like the 650. My plan is to swap the pto flywheel, sator housing, stator and flywheel. At first I thought I could swap the coolant cover from the 650 to 720 to solve the cooling system-hose hookup problem but internally they are different so that won't work. And can't swap the complete head. So you think if I get a 720 exhaust manifold and pipe I should be able to solve the cooling system hookup? The 650 rotary valve and intake manifold are chewed up anyway so I need to find those parts. The carbs. have adjusting screws for low and high speed fuel mixture , I didn't think was replaceable jets. I've never did any major work on a jetski before, so this is kind of a winter project for me. I do have three snowmobiles and know what can happen if a 2 stroke doesn't have the right fuel mixture.
carb rebuild my friend
http://www.seadooforum.com/showthread.php?t=4809
as far as the cooling system leave it the way it was meant to be.
pick up a service manual you'll see how the hose should route I have to figure that little part as well i'm working on a 583-717 swap myself
on the 720 water flows from that 3rd nipple into your pipe's expansion chamber
I wish I could say the difference in the 650 and 717 pipe was the angle of that elbow but I'm not sure
http://www.seadooforum.com/showthread.php?t=4809
as far as the cooling system leave it the way it was meant to be.
pick up a service manual you'll see how the hose should route I have to figure that little part as well i'm working on a 583-717 swap myself
on the 720 water flows from that 3rd nipple into your pipe's expansion chamber
I wish I could say the difference in the 650 and 717 pipe was the angle of that elbow but I'm not sure
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