61X vs 61t ??

[Patio_Furniture]

I have seen people using abbreviation like 61x, 61t, 64u and was just wondering what they all meant or stand for.

Thanks

 

[Matt_E]

Referring to whole motors:

61X/61X = 701, Single carb 61X bottom end with 61X top end. Used stock in 94/95 SJ's and FX1's, and 93-95 Blasters

62T/61X = 701, Dual carb 62T bottom end with 61X top end. Used in 96 - present SJ's (maybe 96 Blaster, not sure about the topend)

62T/62T = 701 Dual carb 62T bottom end with 62T topend. Used in 701 Sitdowns other than the Blaster.

64U/64X = 760 Dual carb 64U bottom end with 760 64 topend. Used in 760 sitdowns.

The 61X topend is preferable for bottom end power, can be bored to 84mm max
The 62T and 64U topends are better for power higher in the RPM band and can be bored bigger.

 

[Patio_Furniture]

Thanks, that is exactly what I was looking for!

 

[Polish jet pilot]

he've read your mind!!

 

[5810]

can a 62t cylinder be ported to mach the 61x cylinder ports. & can a 62t cylinder be resleeved with 61x sleeves

thank you.

 

[Dragonfly]

is there a physical diferance? I think I've heard there stamped.
Do they all mount the same?

Sorry for the newb questions but I'm a kawi guy trying to learn.:wall:

Referring to whole motors:

61X/61X = 701, Single carb 61X bottom end with 61X top end. Used stock in 94/95 SJ's and FX1's, and 93-95 Blasters

62T/61X = 701, Dual carb 62T bottom end with 61X top end. Used in 96 - present SJ's (maybe 96 Blaster, not sure about the topend)

62T/62T = 701 Dual carb 62T bottom end with 62T topend. Used in 701 Sitdowns other than the Blaster.

64U/64X = 760 Dual carb 64U bottom end with 760 64 topend. Used in 760 sitdowns.

The 61X topend is preferable for bottom end power, can be bored to 84mm max
The 62T and 64U topends are better for power higher in the RPM band and can be bored bigger.

 

[Dragonfly]

ok so I looked through ebay and I you can see the diff in manifolds between 61x and 62t.
I'm going to assume that the 62t is the better case?

 

[Matt_E]

What manifold?
The intake manifolds go by cases and are not interchangeable.
The exhaust manifolds go by cylinder, and they are somewhat interchangeable, with some work.
Both cases and cylinders are stamped.

 

[Dragonfly]

What manifold?
The intake manifolds go by cases and are not interchangeable.
The exhaust manifolds go by cylinder, and they are somewhat interchangeable, with some work.
Both cases and cylinders are stamped.

thanks
yes the intake was what I was refering to.
I'm trying to learn the differances in cases and cylinders.

 

[NVJAY775]

I'm learning this too. I talked to a builder last week about getting something going for me this winter. I currently have a 760, but they have higher port timing than the 701. So, like Matt_E said. The 701 is a better low end motor than the 760. I want the quick braap. So I'm going back to the 701 top end, but don't know how big yet.

Just looked at my case. Sticker says 64V and case is stamped 62T00
WTF over?

Also just noticed the cylinder is stamped 61X