Who in the hell would put this motor together???

[yz250f]

Bought a 1990 sj with a "62t/61x" 701 in it. Well I get to looking and the cases are stamped 61x and th cylinder is stamped 62t lol. Could this possibly be a factory motor with a true 62t/61x? Or is the bottom end really a 61x and the top end really a 62t.....kind of disappointed. So if I actually have the real 61x top end and the 62t bottom end. Let me know and make my day. I wouldn't think they'd be stamped backwards but maybe I guess. Thanks.

 

[Dmac80sc]

What does the intake area look like? Two carbs or one?

 

[yz250f]

Just one carb

 

[Dmac80sc]

Yep, most likely a 61x bottom end then. The 62t61x motors came with dual carbs.

Someone might of blow up the older cylinder and just needed something to put on there. The 62t cylinders are a lot cheaper then 61x ones. I don't think they ever built a 61x62t motor from the factory

 

[yz250f]

Dang. Kind of a bummer. I'll probably work on getting cases and cylinders to swap them around.

 

[Dmac80sc]

Why? IT is an ok set up for a stock motor. It might be lacking bottom end a little, but it is ok to run. New seals and gaskets if you do a swap.

 

[Big Kahuna]

not sure, but that may have been a runabout motor.......

 

[BruceSki]

Someone put that together.

I have run one like that before with a cheater pipe and a high compression head. Made plenty of power and was fun to ride. Sure the port timing isn't perfect for our needs but its not the worst thing in the world. I'd just keep running it as is.

 

[ADDict]

Someone put that together.

I have run one like that before with a cheater pipe and a high compression head. Made plenty of power and was fun to ride. Sure the port timing isn't perfect for our needs but its not the worst thing in the world. I'd just keep running it as is.

Agreed, I had two like new engines once, a full 62t and a full 61x. I swapped top ends and made both combos. The 61x bottom 62t top went into a square nose with a pipe, head and prop and was a great little engine!

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[IS0LD0UT]

Agreed, I had two like new engines once, a full 62t and a full 61x. I swapped top ends and made both combos.

That was my first thought on what someone did.

OP. What pipe is on it?

 

[Scraggly]

Don't teat it apart until you have a chance to ride an try it out. You may be surprised. Like addict said. Was a very fun engine in his square. I would do it again if I needed to.

 

[McDog]

Worst of both worlds but it works. Good cheap surf motor.

 

[Big Kahuna]

not sure, but that may have been a runabout motor.......

Just looked, 1996 Raider 700 came with a 61X/61X motor setup, I was thinking that it may have been a 62T cylinder on there, but parts finders shows it being a X cylinder.

 

[Blue]

I have had a couple people use the setup before as their parts were destroyed and it's all they had available. I dont recommend it but it does run. But really its the worst of both worlds. Lol

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[BruceSki]

agreed but hey the motor is already running in his square. I'd ride the balls off it.

Only reason I put one together like that was because I was in the same situation as addict.

 

[mr.fixitman760]

im currently running a 62t 701 cylinder bored to a 760 on 61x cases in my blue SN, never felt it didnt have enough power!

 

[RMBC Freeride]

Back in the day, that setup was commonly referred to as a "Frankenstein". Popular as an inexpensive surf motor. Parts are plentiful and cheap and they run pretty good.

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[BruceSki]

@WaveDemon had the crustiest one of these motors ever! Cheapest surf powerplant out there.

 

[MADMAT]

For you guys that like these....are you running stock cylinders or are they decked with custom domes? I have ridden them decked w custom domes and they are real nice!

I had stock and HATED it for Lake Erie...it was fast though!!

 

[yz250f]

Well i will ride it and see what it has to say about my opinion of it lol. Hopefully it surprises me, it has a protec head and a coffman sizzler. Hopefully it'll have more power than my rock stock 61x top end 62t bottom end 2010 sj. I also had thoughts of getting a 62t case for the square, them swapping the top ends. The 2010 is more of a race ski anyways. And the squarenose will be my freestyle ski. Or I may get the 62t cylinder bored and ported by chuck at cpt.