650/X-2 newbie with a 650sx

[spenaroo]

Far out this is taking longer than expected... i didn't realize it had been 12 months since I got the crank back. Life really does get in the way. Havent touched it since the last post

(3 years since original purchase and start of this thread)

44sbn carby and manifold on the way. With a 9/17 skat prop and a/m exhaust manifold. Oh and a westcoast intake grate.

Assembly of the engine is my plan for the spare time i have this week.

 

[spenaroo]

Okay,
So in assembly the crankcase bolts sheared...

So off to a machine shop they went to be drilled for an extractor.
Then in my oven they went to make it easier

Finally its starting to come together

 

[KawiKid]

how did the crankcase bolts shear? overtightened? stripped?...and what does the oven do? (pretty new to the 650sx myself)

 

[spenaroo]

Bolts sheared from over tightening.
The oven heats the crankcase evenly. Different metals expand at different temperatures. So it loosens the friction and lets the bolt come out easier.

 

[KawiKid]

ah,, got it! any updates on this?

 

[spenaroo]

Still a work in progress...
Been too busy to work on it

 

[cobramaster]

Keep at it. Mine is taking a similar amount of time and started off in similar shape. Almost there though...

 

[KawiKid]

@cobramaster @spenaroo I'm currently trying to determine if ive got a cooling issue. while your 650's are backed into the water ON the trailer, do they piss at idle? or only when you give it gas? thanks

 

[spenaroo]

I'm at a guess 2 weeks off testing. About to tear the top end down again tonight to file the piston. (Not as dodgy as it sounds.... i reused the pistons as clearences were good, as was the skirt. But there is a small nick on one that has built up a little material on the edge of the piston crown. Im worried about expansion under heat, so want to clean it up for peace of mind)

Which reminds me,
Wonder if i have any cans to use as piston ring compressors...

 

[spenaroo]

Engine is in
Wiring is connected.
Battery robbed from a motorcycle, starter thumbed.

And it kicks the starter is turning over the engine.

Hopefully tommorow I have time to drill the throttle bracket bigger (adjuster thread won't fit in) and plumb the carburetor to have her run on her own.

Then swap the prop and install the pump.

 

[spenaroo]

Good feeling to hear it for the first time tonight

 

[Myself]

Nice to see you finally got it together. Do you have any pics of this groove that got machined for the crank retaining clip?

 

[spenaroo]

I'm happy and satisfied with taking this neglected and seized example, turning it into a running ski.

haf some issues with it bogging down and not getting past half throttle. Ater a day on the water playing with mixture screws and a jet change with no luck. I outsourced to someone more experienced for the black magic of tuning.

(Oh and the chin pad is off getting done by a professional. Strugled enough with the hydroturf. And this will need the foam rebuilt. Paint will be done... eventually)