Full Spectrums on a 760?

[Legdragger]

I am putting a 62T-64X 760 motor together and have two sets of carbs. Stock 38's and 46 Full Spectrums. The motor is going to go in a B1 or X2 hull. I am going to up my compression a little, advance my timing and run a Factory pipe, not sure what chamber yet, but I have the Blaster limited chamber and a SJ mod chamber at the moment.

Anyone have an opinion on the stock 38's and the 46 Full Spectrums? I am going to ride surf and freestlye only.

 

[egbrig]

The F/S will work much better.

 

[blaster800]

FWIW I have stock 44's on a BB full mod 85.5mm 62t/61x motor and they hit instantly and crisply with no flaws whatsoever in the surf , with my limited carb experience it took me a couple hours to fine tune them on the lake and I have never touched them since , I could not be more pleased , I really THINK keeping carbs smaller allows the carb signal to be stronger in the venturis throughout the rpm range allowing instant hit regardless of the rpm or load . I dont THINK that you would utilize the full potential of the 46 's .......... just some info from my little experience and also what I THINK .

 

[Legdragger]

I am thinking I wil steal the jetting specs from my imited B2 760 when I rebuid them and start with that in the 38's then test the 46's at some point. Not sure where to start with those though.

 

[ADDict]

Nice to see you thinking about the water Pete!

 

[Big Kahuna]

Pete, go with the Full Specs, give Ed a call, he can get you set up in the right direction.

 

[badvinny]

If you go with the full specs first you will never even try the stockers, gauranteed!

 

[bad93blaster]

I'm still wondering why you want to take a motor that comes from the factory with 44s. Put a pipe on it and drop to smaller carbs. I'm think you will end up with a piped 760 with less power than stock

 

[Scorn800]

Run the 46's

 

[Legdragger]

I had no idea what that motor came with. right now it has 38's on it? or are those 44's you sold me with it?

 

[scottie mac]

The 760 motors all came with Yamaha spec 44s on them. As to your original question, go with the 46 FS. IMO, they are the best carbs ed ever made. My surf ski will be pretty much identical to yours - ported 760, B mod pipe, compression and timing and it will have the same carbs - 46 FSs.

Scottie