TT75 torque for head bolts??

[robinlsb]

Anyone know of the inch pounds torque for the head nuts???


Flex length?


Proper bolts to start the motor from the Motoplat side?

 

[jack burroughs]

I use 160 in.lbs., but you can find that info from Metric torque charts. Flex length depends on what pipe? but many use 9-1/2" to start.

 

[wfo89]

18 ft-lbs (216 in-lbs) is what I have used. Flex length is highly dependent on pipe. Experimentation is your friend. I have run some as short as 8.5" flex length with great results on a Pro 81/82 pipe with axle clutch engaging at 11,700 rpm....

If you are using a starter on a nut that might screw it off, be sure to use RED loctite to hold it on.....

 

[MikeGrady]

I don't recommend going over the recommended 160 in/lbs that Jack stated.
Mike

 

[sundog]

I have used 140 In. Lbs. with no problems.

 

[Pete_Muller]

The same "formula" applies to any engine -- only as much as required and no more.

Over-tightening just about anything on the engines we use in karting generally "bends" something (like the bore out of round, the cases deflect, etc.).

"easy does it"

PM

 

[Don K]

"easy does it"

I have spent thirty years teaching, telling, yelling and preaching, "don't go ape on it" to my technicians. Fifteen years ago I heard you, Pete, say this on your forum and tested it and saw how over-tightening was harmful. Easy does it is the rule!

DK

 

[rainman]

The same "formula" applies to any engine -- only as much as required and no more.

Over-tightening just about anything on the engines we use in karting generally "bends" something (like the bore out of round, the cases deflect, etc.).

"easy does it"

PM

I agree, and I tend to overtighten things, always with negative consequences.