yamaha motor help

[waterfly]

I just got my first yamaha square nose and the 650cc motor is no good. I dont want to rebuild the 650, I want more power.. not nowing the differences in all the yamaha parts, I need a little help. some people have told me to get a 61x motor, and some have said get a 62T motor. what is the difference?? arent they both 701?? what combo of the two will be better if possible??? is the elect. from the 650 I have going to work with the different motor??

never owned, operated, or worked on a yamaha before, I dont know anything about them,(whats available, options, different technical ins-and-outs). I rode a friends sj for the weekend and went and got one I liked it so much. so I need a little help to get started.

 

[Johnny340]

This should rekindle a big debate on engines.
There's some really good info if you use the search function.

 

[waterfly]

I will look into that..

 

[spazzit]

yes both are 701s 61x-single carb--62t-dual carb
there are other diff with them i just dont know

 

[McDog]

I have one for sale for $275 shipped.

http://www.x-h2o.com/threads/55227

 

[Etheraldreamer]

61x cyl
62t case

 

[waterfly]

if I come across a a jull 701 motor say a 61x, what kind of price range should I expect??

 

[kraqus]

How is that project coming along dude?
I will be working on reinforcing my RN hull this week.


Benny

 

[SurferSmurf]

61x cyl 62t case

what is the reason for this combo? its what i have in my ski and never really looked into it. mine is a big bore, but is a 61x necessary for the big bore?

 

[keefer]

61x cyl with 62t cases is the standard engine for all superjets 96 & up and is the platform that most build upon. The 61x cyl & 61x cases is for the 94-95 superjet. Both are 701, the older is a single carb with smaller reed cages. The newer is dual carb with redesigned cases with bigger reeds. More power with the newer engines.

 

[SurferSmurf]

yah but whats wrong with the 62t cylinder?

 

[SUPERTUNE]

Those 62T cylinders came off of sit down skis and have more mid to top end power from a more aggressive factory porting.
62T cylinders gives up bottom end power for standup riders wanting to do tricks . The 61X cylinder porting makes more power down low, hits harder right off of idle.

 

[kraqus]

Thanks for taking the time to respond to this tread....:Banane35:


Kraqus

Those 62T cylinders came off of sit down skis and have more mid to top end power from a more aggressive factory porting.
62T cylinders gives up bottom end power for standup riders wanting to do tricks . The 61X cylinder porting makes more power down low, hits harder right off of idle.