760 carb question

[superjetguy]

So I lost a circlip in my engine. I was thinking of buying a complete 760 with electronics but no carbs and swapping my carbs over and running this engine. Will my 38s work? They're jetted 68.5 pilot 135 mains.

 

[schicks]

38's will work fine, will need to jet up big time. are you sea level? what motor did you have a 68.5 pilot in???

 

[superjetguy]

I'm near sea level and I had those on my 701. It was in one carb at least I can't get the other screws out to check the jetting in the second carb.

 

[schicks]

thats like a machine screw. Drill out the head of the screw and it will pop off, then you can remove the body and have access to the screw stud. 68.5 is lean, heck #70 is stock. You have a b-pipe?

 

[superjetguy]

Yeah I have a b pipe and I will try thanks!

 

[waxhead]

Jetting will be reasonably close bolt them on and try them. You will lose torque from the engine but it will run ok

 

[schicks]

68.5 is reasonably close?...on a 760 w/ b-pipe?

 

[waxhead]

The jetting he has on his 701 will be quite close. Just because you put the carbs on a larger engine does not mean you will need bigger jets

 

[schicks]

yes, but it sounds like he is running the 701 with small jetting to begin with (smaller than stock) plus he has a B-pipe and running at sea-level, and he roached his last motor.

I think a #75 is a better starting point, 1.5 n/s and 135 or 140 main jet, start L screw at 1 turn out and high at 1-1.25 turns out. I would start with the 140

 

[Dustin88]

I think stock dual 38s on 62t couch 701s had 68.5 pilot jets

 

[schicks]

I think stock dual 38s on 62t couch 701s had 68.5 pilot jets

that could be true, i am not sure. Would make sense with the 760 having higher port timing i guess, he had these carbs on his 701 previously based on his wording.

 

[superjetguy]

when i first got my ski it had a 62t/62t engine so its possible the jets are from a couch, right now im going to swap the crank and top end from my 61x onto these 62t cases and save money for a big bore i believe, im still weighing my options.

 

[schicks]

port the 701 and that will be just as good as a big bore IMO.

 

[superjetguy]

the 701 that blew up was ported... who should i look into for case porting? im still running all stock electronics

 

[waxhead]

why bother the 760 is a good engine just make sure it has some compression in it and it will go very well. Use the 61x electrics