61x/61x to 62T question

[Jdhorn]

I have 2 healthy complete and running factory sealed 150psi even 701 engines. A 61x / 61x single carb 701 and a 62T/62T duel carb raider engine.
I want to convert my SN to a duel carb 701. My question is which direction to take.
Option 1: Heli coil the threads to swap the 61X exhaust onto the 62T engine and swap the 61X head.
Option 2: Swap the whole 61X top end onto the 62T bottom end. Probably including the pistons to keep them matched to the cylinder.
Option 3: Someone gives me a deal on an aftermarket pipe and 62T style manifold.
Option 4: Something I am not aware of that make the most sense.

Im kind of leaning into not cracking the 61X/61X engine open so as to sell it or keep it for something. That would force me to at least buy a SJ 701 head of some sort to mount the 61X exhaust.

 

[mk1]

Is your SN a 650.?

 

[Jdhorn]

No.
Currently its a 701 XX engine. I swapped the 650 out years ago. Then after recently putting another 61X/61X in my wifes ski I suddenly became motivated to go duel carb and acquired a raider engine. I am also wondering if im better off just leaving the 61X / 61X in it. People say the duel carb skis pull a lot better.

 

[jetx]

Keep the 61x you have and get a pipe

 

[Tyler Zane]

I would go with option 2 but not until winter or you just have time. Ride that sob for now. Start saving for a pipe and port job so when you swap the 61x cylinder over to the dual carb 62t cases you can really make it worth your while.

 

[Jdhorn]

Does anyone know the power difference between 61x/61x single and a 61x/62t duel with stock pipe? I would hope it is pretty noticeable to make it worth it. What is the going rate for a used Pipe? I dont want to pump too many dollars into this old ski even though its still really nice.

 

[cookn]

I agree with jetx. just keep the 61x and put a pipe on that. Where the 61x cylinder on the 62t case is a popular combo I dont think its worth your time swapping everything around if you are just keeping the stock exhaust and head anyway

 

[Jdhorn]

Since know one has suggested dropping the duel carb plate onto the 61X case, can I assume it doesn't fit and or is a bad idea? I know the cases are most certainly different but haven't investigated compatibility of the carb mounting intake plate. I had been avoiding pipes mostly because i like robust stock power and girdled heads seem to be an additional highly recommended cost to go with.

 

[Meh]

Does anyone know the power difference between 61x/61x single and a 61x/62t duel with stock pipe? I would hope it is pretty noticeable to make it worth it. What is the going rate for a used Pipe? I dont want to pump too many dollars into this old ski even though its still really nice.

I have a used protec black cast chamber pipe I'll sell, in good shape. Makes great power and much more budget friendly than a bpipe.

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[jetx]

You can't install a stock 62t dual carb setup on 61x cases

Personally I dont think it's worth all the work just to go to dual carbs and the 62t cases.

You don't need to run a girdled head with just a pipe...and a pipe will be plenty reliable although you are right they can be Spendy, but a b pipe is a good part to buy, will fit on any future ski's with the 701. You will need a new impeller though as the stucker sucks and won't be paired right with the pipe, and you should mod your Cdi or get a msd enhancer.

If you don't want to add a pipe I would mill your stock head, and get a hooker 9/15, and a scoop grate.can also advance your stator plate 3 degrees and mod your Cdi, than your ready for the pipe when finances permit.

Should satisfy your need for more zip...but you really should get a pipe, they are what they are cracked up to be and worth the money.

 

[jetx]

You can't install a stock 62t dual carb setup on 61x cases

Personally I dont think it's worth all the work just to go to dual carbs and the 62t cases.

You don't need to run a girdled head with just a pipe...and a pipe will be plenty reliable although you are right they can be Spendy, but a b pipe is a good part to buy, will fit on any future ski's with the 701. You will need a new impeller though as the stucker sucks and won't be paired right with the pipe, and you should mod your Cdi or get a msd enhancer.

If you don't want to add a pipe I would mill your stock head, and get a hooker 9/15, and a scoop grate.can also advance your stator plate 3 degrees and mod your Cdi, than your ready for the pipe when finances permit.

Should satisfy your need for more zip...but you really should get a pipe, they are what they are cracked up to be and worth the money.

 

[Jdhorn]

Meh, Thanks for the offer. Ill research them a bit. Let me know what you are looking to get out of it.

Jetx, Thank you for the insight. Im new to opwer modding these and have a lot to catch up on. Currently I have a Swirl 13/17 Free Ride, Worx grate (whatever the less aggressive one was) and a quadra fin ride plate. Would that prop accommodate the power?

 

[DarkWater]

Wiki says 61x makes 63hp while 62t makes 73hp..
i just swapped a motor over to 62t bottom from a B1 and i feel like i lost bottom end.. but I had a WetJet intake combobulation on the 61x so it's hard for me to say stock to stock comparison.



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[cookn]

the wet jet 61x motors made more power then the regular 61x engines

 

[twisterad3]

Get a 46mm carb on that 61x and sell the 62t. If you want more power, get a JM735 kit. They're single carb friendly.
Also, I agree with putting a pipe on it.

 

[DarkWater]

the wet jet 61x motors made more power then the regular 61x engines

True. The differences, depending on WJ model, Westcoast head, exhaust and manifold with 46mm mikuni, said to have as much as 90 HP with all Westcoast mods.
Still a 61x shortblock.

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[Jdhorn]

Thanks for all the input everyone

 

[bored&stroked]

Why not just swap the 61x cylinder onto the 62t bottem end like every superjet has come from the factory since 96? You have the parts, its easy, and its cold outside. Or bore that 62t cylinder to 84mm and have yourself a 760 and swap that in. Many options.

 

[Jet_jase]

Keep the 61x motor, tuned right with a pipe they pack a punch. I run one with a 5mm adr crank and it's a wicked surf motor.

 

[Tyler Zane]

Just because some of you are ok with a 61x bottom end doesn't mean he should sell his. There is no argument that its a better crankcase that makes more power.

Ride what ya got, until your ready swap the 61x cylinder on the 62t cases. Its not an opinion that its a better option and makes more power, its a fact.

Id wait till you can afford a pipe and some port work and do it all at once.

I personally hate a 9/15 impeller as someone recommended above, I like a 10-16 with a bored reduction nozzle.