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  1. #1

    re sleeve or bore out?

    Got my head off last night and found #2 and 3 have "wavy" bores. piston options are .01,02 and 04 oversize, personally i am not comfortable hogging .040 out of a .080ish sleeve, but if .020 will clean it up is that the recomended route? OR should i not bother and just order sleeves?

    Next question is there any reason not to use a local machine shop? They have more than likely never seen this block before. Should i just pay up and send it to rd?

    Last question, regarding crank bearings. Crank looks good but could use a clean up (one journal in particular). Is there any logic to the yamaha sizing chart for bearing or am I stuck with my factory bearing size?


  2. #2
    big john's Avatar
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    anyone ????

  3. #3
    No need to re-sleeve. 1mm / .040 over is safe on factory sleeves.

  4. #4
    shhr's Avatar
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    No need to re-sleeve. 1mm / .040 over is safe on factory sleeves
    .

    +1

    I would send the block to someone who has bored these blocks R&D, Riva and there are several others they would have made a plate to torque the block which is the best way to prep the block IMO

  5. +1 by:


  6. #5
    Quote Originally Posted by shhr View Post
    No need to re-sleeve. 1mm / .040 over is safe on factory sleeves
    .

    +1

    I would send the block to someone who has bored these blocks R&D, Riva and there are several others they would have made a plate to torque the block which is the best way to prep the block IMO
    I am hesitant about a local shop. I've am taking my block to a recommended local shop tommorow to chat about it.
    Will ask about the torque plate and see what they think, depending on how it goes I may have them do the work. They do a lot of small engines, Yamaha in particular. My fear is that they haven't seen this block before.

    Thanks for the replies
    I am in Vancouver Canada and as far as I know RD is the closest place, I have a us po box that saves major shipping hassle.

  7. #6
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    The only thing is find out why the cylinders got wavey, Make sure you have a afr gauge to make sure you are not running lean. And also have the head surface checked for straightness because i have seen many that are warped and you will get cross leaks and even water getting in.

  8. #7
    Quote Originally Posted by JIM'S PERFORMANCE View Post
    The only thing is find out why the cylinders got wavey, Make sure you have a afr gauge to make sure you are not running lean. And also have the head surface checked for straightness because i have seen many that are warped and you will get cross leaks and even water getting in.
    Good call on the head surface, I'll get it checked. Its only #2 and 3 that are wavy. I've run an AFR gauge ever since I put the c3 wheel installed. There are signs of detonation on the head of those cylinders and I was always aware that they run leaner. I've done my best to keep it at 11.8, however I live on a small island and fuel quality is likely the main issue. Will aim for 11.5 and Lower next time OR I need to start hauling fuel from town...

  9. #8
    gordon lasiter #328's Avatar
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    Quote Originally Posted by rossnemo View Post
    No need to re-sleeve. 1mm / .040 over is safe on factory sleeves.
    I had riva do the machine work on my block for the .40 oversize pistons with the oem sleeves.....

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