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Discussion Starter #1
Hoping someone here can help me out. I would like to run a Kitaco 54mm stroker crank with our current Trail bikes 54mm X 69mm top end including the TB race head. Not sure it will work due to crown height. From what I've read it seems like there is about a 1.5mm diff but still not sure on that. Was wondering if I could just use a spacer plate under the cylinder to make up for the diff. Or would it be possible just to use a Kitaco piston and our current head?



Thanks for anyone that can help shed some light on this!
 

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miniquaddad90 said:
Hoping someone here can help me out. I would like to run a Kitaco 54mm stroker crank with our current Trail bikes 54mm X 69mm top end including the TB race head. Not sure it will work due to crown height. From what I've read it seems like there is about a 1.5mm diff but still not sure on that. Was wondering if I could just use a spacer plate under the cylinder to make up for the diff. Or would it be possible just to use a Kitaco piston and our current head?



Thanks for anyone that can help shed some light on this!




Everything is possible,but first check if its worth all this.The spacer plate under the cylinder is the easiest way,but more important is the squeeze and the compration ratio you will run.What do you mean current head ?69mm is big bore,you will need big valves for sure and many other parameters important to run it.
 

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The Kitaco crank would push the current (if TRX 49.5 crank now) out the top of a 69mm tall jug. A spacer may work, with a well-used cam chain, but a piston swap is a better plan.



The TB 312 piston is what I'd use for your application. The 522 can be used, but requires minor chamber mods, and gives quite a bit more compression. I use them on most of my 95/117/124 TB builds, since it's lighter than the older offerings.
 

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Discussion Starter #4
MagicJuice said:
Everything is possible,but first check if its worth all this.The spacer plate under the cylinder is the easiest way,but more important is the squeeze and the compration ratio you will run.What do you mean current head ?69mm is big bore,you will need big valves for sure and many other parameters important to run it.


Thanks for the help, to clarify using the china style 54mm bore X 69mm tall cylinders. Basically the TB "import 114cc" kit with TB race head. If what I've read is true, by running a 1.5mm spacer plate, everything else should remain the same, comp ration, etc... being that our current piston & crank is targeted at a 19mm crown height and the Kitaco crank is targeted at a 17.5mm crown height. correct me if im wrong....



Thanks guys!
 

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Discussion Starter #5
firepower354 said:
The Kitaco crank would push the current (if TRX 49.5 crank now) out the top of a 69mm tall jug. A spacer may work, with a well-used cam chain, but a piston swap is a better plan.



The TB 312 piston is what I'd use for your application. The 522 can be used, but requires minor chamber mods, and gives quite a bit more compression. I use them on most of my 95/117/124 TB builds, since it's lighter than the older offerings.


Thanks Terry, I was hoping you had some insight here! Cheers! :D
 

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Discussion Starter #6
Terry,

What about using the Kitaco piston with the TB race head? I would imagine not due to dome differances but never had had my hands on a Kitaco head



Thanks
 

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SE head has a wider, flatter chamber, so the piston isn't going to give the compression in a TB head. I compared the SE, TB, Tak R-Stage (not +R, same issue as SE) and the Tak will work, if you aren't liking the TB. I have them all on hand:)
 

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Discussion Starter #9
firepower354 said:
SE head has a wider, flatter chamber, so the piston isn't going to give the compression in a TB head. I compared the SE, TB, Tak R-Stage (not +R, same issue as SE) and the Tak will work, if you aren't liking the TB. I have them all on hand:)


U the MAN Terry! Thanks for checking that out! Just entertaining options at this point. Have a chance at a Kitaco crank and going to manual clutch and a kicker very soon... I owe you at least a case of beer or a bottle of something by now for all of your help! PM me a paypal address and let me throw you a bone for your help!
 

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Nah, thanks, but that's what I'm here for. Besides, I get a little less reserved when I drink;)



You CAN, however, remember the old FP when you're ready to make a purchase:)
 
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