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Post by wi77stingguy on Oct 29, 2017 7:45:49 GMT -5
Hello all just got this sled its pretty clean but has the common pto seize from what I hear well it has 2 6 bolt engines with it 2 nice ski springs with shocks a spare para rail that has all "free" linkages etc rear shocks brackets etc I had a 79 tk 440 years ago that engine ran good any tips on best way to do my engine? What type of sealant etc thanks
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Post by 80sting440 on Oct 29, 2017 16:59:27 GMT -5
Hello sting guy! Welcome aboard.
I just went through a complete rebuild last summer. The guys here were full of good advice. You can follow my thread here. scorpionsleds.proboards.com/thread/1522/hello-winnipeg-manitoba
The sealant I use and trust is Moto Seal by Permatex. Honda Bond and the Yamaha's version of 2 stroke case sealant are also very good...pick any and they all work well if you follow instructions.
Enjoy the journey.
Rene |
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Post by wi77stingguy on Oct 29, 2017 18:26:38 GMT -5
Thanks for the reply Rene I have been reading about sealing the cylinders and top end 1st is there a preferred gasket kit you use and whats this two base gaskets thing to move the porting thanks
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Post by 80sting440 on Oct 29, 2017 19:26:07 GMT -5
I, along with some others on this site, use Winderosa gasket sets.
This "doubling up" of base gaskets is a quick way of raising all of your ports for more upper rpm power. This along with eliminating head gaskets or shaving down your heads, along with using gaskets, is a 2 stroke trick that is sometimes used on other engines. This also reduces usable trail power (lower and mid range torque). Most of the racers on this site seem to grind away at the ports to massage them as needed...you may not want all of your intake, transfer and exhaust ports raised .019"!!! Our engine barely has enough useable lower torque as is, so I leave mine stock and enjoy it for what it is. When Cuyuna bought out the JLO engine company, they went to town on the porting and increased the hp quite significantly...good enough for a daily rider as mine!
Unless you're seriously looking at racing this sled, my advice to you is to work at trying to keep this engine from melting yet another piston...that seems to be one of the challenges facing us with our beloved Cuyunas.
I wish you the best success,  Rene |
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Post by wi77stingguy on Oct 30, 2017 17:29:07 GMT -5
thanks Rene I might just take one of the other 2 engines and just redo one of those I dont know yet I had enough of racing etc in my younger years with cross country etc I just want something to take to vintage shows and to ride down the trails and humanoids go OHHHHHHHHHH isnt that cool!! my dad had one just like mine when I was in hi school that I just drooled over like a st bernard lol!
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Post by weverat on Oct 30, 2017 18:45:58 GMT -5
I would not change the ports on a modern 6 bolt Cuyuna engine. In stock form they make good power from 4000 to 7000 rpm.
To keep them from burning pistons, I set the ignition timing down to the low side of spec.
Are your motors vertical plug heads (hemi heads) or are the spark plugs at an angle (trench heads). It makes a difference as the trench heads run hotter and need the timing set lower to keep them from burning a piston.
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