61x 62t differances?

[ghost183]

im curious, its been a looooooong while since ive been in the scene, getting back in now after 13 years

but whats the pros/cons/differances of these 2 motors?

starting a build and need advice.. errrr. guidance

 

[Crab]

im curious, its been a looooooong while since ive been in the scene, getting back in now after 13 years

but whats the pros/cons/differances of these 2 motors?

starting a build and need advice.. errrr. guidance

I just got back in after being away for 12 years, x motors were single carb, T motors are dual carb with better flowing cases. They both use 61x cylinders, T cylinders are from Blaster 2's with twin 44 carbs. Confused? T cylinders have higher port timing for more top end power.

 

[Mouthfulloflake]

61x = suck

62t = expensive

 

[ghost183]

crab..
so.. if you, or anyone here, had a choice of a modified X motor or a almost identical T motor, which would be a better choice, both dual carbs, 200compression, ported, the works, ex race prepped motors, both putting out about 110-115 hp

im thinking about future mods, parts availability? resale?

 

[Big Kahuna]

I just got back in after being away for 12 years, x motors were single carb, T motors are dual carb with better flowing cases. They both use 61x cylinders, T cylinders are from Blaster 2's with twin 44 carbs. Confused? T cylinders have higher port timing for more top end power.

T cylinders are not from Blaster II's (B2 uses a 754cc cylinder, not 701). The T cylinders were used on the Raider 701's (or any other Yamaha sitdown that ran a 701cc engine)

in a nutshell, you can build a strong 61x utilizing the single carb setup, or you can build an equally strong or stronger motor using the 62T case/61x cylinder setup.(This came standard on all 96-2008 SJ's).

 

[Big Kahuna]

crab..
so.. if you, or anyone here, had a choice of a modified X motor or a almost identical T motor, which would be a better choice, both dual carbs, 200compression, ported, the works, ex race prepped motors, both putting out about 110-115 hp

im thinking about future mods, parts availability? resale?

62T case / 61X motor is my choice, you have more options as to what you can do with it.

 

[surfjetlouie]

Plus one minus X plus T.
is that help?

 

[SUPERTUNE]

61x cylinders and 62T cases and you'll be way ahead for updating your mods for more power every season as it fit your budget! This shouldn't be a problem when you buy a RN ski!

 

[ghost183]

hmmmm

ok, i think i get it now, but.. i cant have the best of both worlds

my options are limited to either/or, i can purchase either a complete 61x with dual carbs, or a 62T with dual carbs.. the 61x intake was ported but still has stock bolt pattern, but the 62t has been molested due to porting the intake and new bolt holes were drilled, therefore calling for custom manifolds if i was to ever update, which i doubt, but anyway

what do i do? which would be better?

 

[njfl]

62T cases are a little more desirable due to the fact that more people have placed more R&D into building freestyle motors from them. If you're not going with a huge displacement motor (>800cc), I believe that there won't be much of a big difference in what you can get out of them. At least the difference won't be noticeable enough to justify the $50.00 price tag on 61X cases vs. the $200.00+ price tag on 62T cases.

The 61X cylinder would be your beter bet for a freestyle build although I had Team Scream (SUPERTUNE on here) rework a 62T cylinder port timing for me and I am quite pleased with it.

 

[njfl]

ok, i think i get it now, but.. i cant have the best of both worlds

my options are limited to either/or, i can purchase either a complete 61x with dual carbs, or a 62T with dual carbs.. the 61x intake was ported but still has stock bolt pattern, but the 62t has been molested due to porting the intake and new bolt holes were drilled, therefore calling for custom manifolds if i was to ever update, which i doubt, but anyway

what do i do? which would be better?

I'd lean toward the 62T if cost isn't the deciding factor. How was the 62T molested? Are the cases damaged, or is the intake damaged? Are you saying that the portwork ran into the threaded holes where the intake mounts?

 

[njfl]

the 62t has been molested due to porting the intake and new bolt holes were drilled, therefore calling for custom manifolds if i was to ever update, which i doubt, but anyway

what do i do? which would be better?

Oops. Missed that the first read.

Can you post a picture of the porting? You may be able to use a reed spacer as the adapter to fix the problem.

 

[ghost183]

hey njfl..
thats the info i was looking for, thanks pal

i dont have an interior shot of either motor, just paperwork with specs, the 62T cases and intake track were "opened up" substantially to get a mid to top end motor, the intake track of the motor was opened up to allow a bigger, better flowing manifold, the manifold is custom, not off the shelf.. so i dont have specs on it, i dont know if the stock intake holes were " ported out", but the current manifolds bolt holes are outboard of the originals

but the 61x cases are stock, the intake was ported but still retain the stock intake bolt pattern

you pretty much hit the nail on the head when you mention whats better for a freestyle motor,

thats what i need, freestyle powerband, a good all around motor thats once bolted in, will keep me busy for a long time, enough to shoot the boat out of the water on hole shot and a good strong pull till the limiter, i dont think ill be upping to a big bore 989 or similiar, and again, you guys are insane running those big motors, but anyway, kudos, i guess your " :censored: " clank

so...
to sum up, both are good motors, but, if i even feel the need for neck snapping holeshots, or blinding top end, i guess i should go with the 62T, if i think ill be happy with 100-110hp, stay with the 61x?

correct?

 

[njfl]

I would say that is pretty correct, based on all the real-world results we have out there. I don't know of anyone who has built a 61X-cased mega motor (big Lamey or ADA) to do a seat-of-the-pants comparison.

On the 62T cases, I really would ask for a picture of the intake rework before buying. Then post it here. I am having a difficult time visualizing what they could have done that would require modifying the intake mounting surface of the cases.

 

[ghost183]

im lost either way, but ill try to get one,

but out of curiousity, being that you mentioned the T cases are used for mega motors, is that cause they are stronger? better flowing? whats the differance in the cases? or just a better crank?

 

[njfl]

im lost either way, but ill try to get one,

but out of curiousity, being that you mentioned the T cases are used for mega motors, is that cause they are stronger? better flowing? whats the differance in the cases? or just a better crank?

The 62T cases have the reeds placed horizontally, with a straight run into the cases. Some builders believe that this is an advantage. Overall, I think it is just the newness of the 62T design and their availability.

When you get to the huge cc motors, both 62T and 61X have a bigger limiting factor, the spacing between the cylinders and the narrow common volume siamesed between them as the bores get bigger. That's why some people are looking at the GP800 twin setup as a foundation, having more volume between cylinders due to the wider cylinder spacing. However, I have not seen this spacing limit of the 62T cases yet, but do believe that it exists.

 

[ghost183]

i personally think the HP im receiving is quite enough, i remember back in the days the 60-70hp i had, had that wow effect on the hole shot, and i have yet to see water thats glass enough to break speed records on skis up here in NY,

but i really appreciate your help pal, cleared a few things up in my head, want to see if i can get lucky and chenge my order to a T cased, X cylindered ported stroker, otherwise, im sticking to the current invoice

but i do have another question since i have your attention

just shootinf it out there, but i found 2 props available, a 15/21 and a 13/20, which would be better running around 100hp? and what kind of top speed would each produce?

can that be calculated somehow?

is there a formula?

 

[accbr]

Here's a couple I have sitting in the garage. 61x cases on the left, and 62t cases on the right. You can see the 62t cases have a more direct shot for the air/fuel mixture to get into the crankcase.

 

[750SX]

im lost either way, but ill try to get one,

but out of curiousity, being that you mentioned the T cases are used for mega motors, is that cause they are stronger? better flowing? whats the differance in the cases? or just a better crank?

cranks are the same, it's just that the t cases flow better and I believe they have bigger reeds than the 61x cases.

 

[njfl]

just shootinf it out there, but i found 2 props available, a 15/21 and a 13/20, which would be better running around 100hp? and what kind of top speed would each produce?

can that be calculated somehow?

is there a formula?

Given those two choices, go with teh 13/20. You'll enjoy it more overall. You might get an extra mph from teh 15/21, but your bottom -end will suffer significantly.

I don't know of any (nor do I know of anyone who has one) calculations for this.