62t max bore

[JeskiBoji]

What’s the max bore on a 62t 701 are the sleeves the same as 61x or thicker? On an old post Matt e talked about boring one to 85 mm

 

[Big Kahuna]

I have seen 85mm once........ Skirts were thin!!!!!!!!!!!!!!
Would not advised going that wide.

 

[Storbeck]

I have one at 84mm that has given me no trouble for...6 years now I think... Long enough that I've lost track.

I'd be very hesitant to go any bigger than that.

I have a 64x at 85.5 that I'm planning to eventually freshen up at 86.

So take that for what it's worth. One data point.

 

[Storbeck]

The sleeves are thicker than a 61x but they neck down at the bottom where they go into the case to about the same size as a 61x and then for some reason they have a grove so that spot is the thinnest spot

 

[MTRHEAD]

62T has two different sleeves

701 62t. Groove in bottom. Seen them at 84mm
760 62t. No groove seen them at 85.5 (some people will say 86mm but they get super thin on the bottom).

Many aftermarket sleeves are straight diameter so they can go 85.5 and sometimes 86mm

 

[JeskiBoji]

in that post he said boring a 62t up a ways lowers it port timing having a hard time understanding that. Is it accurate? 84 sounds like a good number thanks for the info

 

[Big Kahuna]

in that post he said boring a 62t up a ways lowers it port timing having a hard time understanding that. Is it accurate? 84 sounds like a good number thanks for the info

If you look at the port roof, it angles down a bit, so by over boring, you are effectively lowering the roof the the port window. But this is a minuscule amount.

 

[JeskiBoji]

that makes more sense thank you!

 

[Quinc]

Is there a thread on piston sizes? Like a 84mm pro-x vs Wiesco vs SBT vs WSM? Wondering if you could go up just a hair in size by switching brands.

 

[JeskiBoji]

Is there a thread on piston sizes? Like a 84mm pro-x vs Wiesco vs SBT vs WSM? Wondering if you could go up just a hair in size by switching brands.

Somebody on here said that oem Yamaha pistons measure slightly bigger than pro x but those are only available in a couple of sizes. Too bad they don’t offer the sized pistons a-d like some of the outboards and other power sports stuff

 

[Storbeck]

I'm not sure what you're trying to do but 84mm is stock bore for a 760 so there's a chance you can find 84.25 if you're looking for slightly more than 84.

 

[WFO Speedracer]

Is there a thread on piston sizes? Like a 84mm pro-x vs Wiesco vs SBT vs WSM? Wondering if you could go up just a hair in size by switching brands.

Not really without ordering stacks of pistons, The WSM's run a pretty consistent size from the ones I have seen , the Wisecos and Wossners being forged would of course take up space because of the extra piston to wall clearances needed to run them.

 

[Big Kahuna]

I'm not sure what you're trying to do but 84mm is stock bore for a 760 so there's a chance you can find 84.25 if you're looking for slightly more than 84.

He does not have a 760. He has a 62T 701

 

[Storbeck]

He does not have a 760. He has a 62T 701

Yes and 760 pistons work great for a 701 62t that is at max bore, 84mm.

 

[Big Kahuna]

Yes and 760 pistons work great for a 701 62t that is at max bore, 84mm.

I was reading your post from different POV.

 

[waxhead]

62T has two different sleeves

701 62t. Groove in bottom. Seen them at 84mm
760 62t. No groove seen them at 85.5 (some people will say 86mm but they get super thin on the bottom).

Many aftermarket sleeves are straight diameter so they can go 85.5 and sometimes 86mm

best answer