SN SJ ENGINE REBUILD!!!!!

[bmason05]

Turning an old worn out 92 sn sj 650 into a mean machine slowly. After a lot of thought and conversations with jetmaniac, I finally decided on a swapping to 701. Didn't want to do body work till next winter so I went all in. JM sent me all the goodies for the build and thought I would post to maybe help fellow newbie builders like myself. Taking out the old 650 was actually easier then I thought, I'm the guy using sandwich bags to label all the bolts. After getting everything situated with JM, he ended up sending me basically a new motor other then the crank and carb. Carb rebuild obviously was first on the list which was also easier then I intended as well. I will post pics as I go, but all in all I will have a 735cc engine painted all gloss black with every bolt polished. No pipe just yet but will have 9/15 hooker, intake grate, lightened flywheel, and rebuild midshaft by this summer...

 

[bmason05]

The new beast


Sent from my iPhone using Tapatalk

 

[iangdesign]

I would suggest looking into some kind of exhaust upgrade as soon as possible. You are going from a 650 with stock exhaust to a 735 with a 650/701 exhaust. That bad boy needs to exhale!

 

[bmason05]

Yes sir, I am opening the exhaust ports as much as I can but damn, homie ain't made of dollar bills!


Sent from my iPhone using Tapatalk

 

[bmason05]

Any damage not having AM exhaust?


Sent from my iPhone using Tapatalk

 

[Fx1 Love/SJ Love AZ]

That what I was thinking. Putting $650 into your engine to beef it up and make it a beast is a very nice thought. You get so much out of that, then looking into another $350 minimum plus for a pipe haha that hurts. A grand deep maybe more. I am probably going to end up in the same boat, rebuilding my 701 into a 762 cc but I don't have an aftermarket pipe or the funds for one at the moment. I think it will be fine with the slick exhaust. One day we will all have B pipes!

 

[iangdesign]

I can understand running a stock engine with stock exhaust, but spending money on upgrading your engine and then running stock exhaust eludes me. I'd spend the skrilla cat-a-pillas on the exhaust first get everything I can out of my stock engine...mill the head, bigger carb(s), port the engine. Then upgrade the engine after getting everything I could out of it.

But whatever get y'all on the water an having fun...that's all that counts!

 

[N3vrSat1sfied]

agreed, exhaust should of came first. Honestly, you would of probably had more power gain with the bpipe on the 650 than the 735 with stock exhaust.

Sorry, if this comes off wrong, I dont mean to bash you at all, just throwing in my 2cents.

 

[bmason05]

sooo true but comes with the sport.... hopefully it doesn't clog the exhaust to much but I am sure it will perform.. Totally understand your point iangdesign but was also advised to not build a 650. waste of time/money... owell, to each his own but I will get a bpipe..... any body want some 650 parts hahaha...

 

[bmason05]

no hard feelings, knew that was coming.... im just happy to have a nice candy painted engine. The 650 I took out was not in the nicest condition (rigged together) so im glad I did what I did with or without a pipe... Atleast its another square with a 701 right??? I look at the glass half full gentlemen.

 

[iangdesign]

We all do!

Have fun with your build and ride the pizz out of it this summer!

 

[bmason05]

Will do, I should be in the pro circuit this spring with the sn so be watching for me. Its the sn with out the b-pipe.

 

[Fx1 Love/SJ Love AZ]

When you start with a non runnin motor requiring rebuild. It's cheaper to rebuild the way you want it before rebuilding to stick then building up. That's buying the same stuff twice almost. A pipe is a must but I've seen people out on the lake having a good time on a 550 with no aftermarket parts I'm glad I have a superjet and have a good time regardless. It's just unfortunate the engine is in need of help and the stock exhaust is still there in great shape. And btw that motor is looking baller so far, you'll be happy when your out riding and not wrenching anymore.

 

[bmason05]

cant wait to hear her purrrrrrrrrrrrr...

 

[bmason05]

for those of you that have done this before, any pointers on the crank seals?

 

[iangdesign]

Remove the case halves...take a pic of the old ones still installed...then install the new ones the same way you yanked the old ones out.

 

[bmason05]

touché! I feel like a retard.

 

[bmason05]

different case half's (650 to 701) but same crank seal set up....

 

[pwcbret]

for those of you that have done this before, any pointers on the crank seals?

Put a little 2 stroke oil or assembly lube on the seal when you install. Use Threebond 1211 to seal cases and torque to spec in sequence. Building a wooden frame from some 2x4's makes a good base to set the cases on.

 

[bmason05]

Good deal! Got the 1211 and will do that with 2x4s! Thanks


Sent from my iPhone using Tapatalk