86 w/ long rod.
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  1. #1
    Junior Member moonboy274's Avatar
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    86 w/ long rod.

    my 86 R has a long rod crank in it. What piston should I be running in it with the long rod? I was thinking the 86 style piston with a plate on the cylinder. Not sure if Im correct any input would be great . thanks.

  2. #2
    Senior Member matuus's Avatar
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    correct.


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  3. #3
    Senior Member Langbolt's Avatar
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    Yes! '86 style cylinder with the 130.0mm long rod use a '86 style + 0.190" Aluminum Spacer + 2 base gaskets. Be sure to do a squish test (piece of "L" shaped lead solder inserted into the spark plug hole then crank over the motor so it squishes the solder at the edge of the cylinder....measure the thickness and make sure it's more than 0.038")

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    Junior Member moonboy274's Avatar
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    Quote Originally Posted by Langbolt View Post
    Yes! '86 style cylinder with the 130.0mm long rod use a '86 style + 0.190" Aluminum Spacer + 2 base gaskets. Be sure to do a squish test (piece of "L" shaped lead solder inserted into the spark plug hole then crank over the motor so it squishes the solder at the edge of the cylinder....measure the thickness and make sure it's more than 0.038")
    Thank you for the info, The L shaped lead solder how big does it have to be and do I stick the spark plug back in while the L piece is in there? Does the L piece stick out of the spark plug hole ?

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    Senior Member acecarlos's Avatar
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    Quote Originally Posted by moonboy274 View Post
    Thank you for the info, The L shaped lead solder how big does it have to be and do I stick the spark plug back in while the L piece is in there? Does the L piece stick out of the spark plug hole ?
    Moonboy274:

    Here you go the Link to...BDT Solder Squish Test below I posted 10 years ago, pictures and full explanation. Any Questions; Call BDT Motorsports 909-466-9152.

    https://www.trx250r.net/forum/bdt-mo...-test-sqt.html

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  7. #6
    Junior Member moonboy274's Avatar
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    thank you that will help a lot. This is my first time at this so I feel dumb asking the questions I ask.
    american opel and acecarlos like this.

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    Senior Member american opel's Avatar
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    better to ask questions then have a failure not asking them.

  9. #8
    Junior Member moonboy274's Avatar
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    very true , one more question if my piston size reads 67.85mm I would need to buy a 68mm piston to replace it ????

  10. #9
    Senior Member matuus's Avatar
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    yes. 68. is next size.


    i have the best. bdt built engines.
    bdt261 oem
    bdt363 prox
    bdt431 puma
    bdt561 saber
    Sent from my iPhone using Tapatalk
    acecarlos likes this.

  11. #10
    Junior Member moonboy274's Avatar
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    So my cylinder looks good no scratches or wear marks and my piston looked great besides the top. All I should have to do is hone the cylinder? If the piston that came out of it is 67.85mm the 68mm should slide right in correct?


 
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