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Thread: 300xs Rebuild

  1. #1
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    300xs Rebuild

    Picked up a 2006 300xs that leaned out #6 and hurt itself.
    Got it torn down to the bare powerhead this morning.

    Going to probably sleeve the bad cylinder, deglaze the other 5 and put new bearings and rings throughout. Luckily the head is fine. Not sure if I should trust the carbon fiber reeds or order new?

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    Last edited by RSWORDS; 04-26-2020 at 11:05 AM.

  2. #2
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    So I'm torn between a new sleeve and a known good used picton from a member here, boring just #6 (which I've never liked the idea of just replacing one over sized piston even though the weigh the same and are balanced) or boring all of them and replacing all the pistons.

  3. #3
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    Coming from a automotive background I never liked the idea going one size over and the rest standard bore. I decided to try it and had no issues also heard guys with couple cylinder oversize with no issues.
    Inspect other pistons for wear and sticking rings if all fine I'd reuse them

  4. #4
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    Bobby is that your motor or a customer? I might be looking to trade my drop on 300x for a 300xs.

  5. #5
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    Quote Originally Posted by vnemous View Post
    Bobby is that your motor or a customer? I might be looking to trade my drop on 300x for a 300xs.
    Mike whats difference in the x vs xs?

  6. #6
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    Quote Originally Posted by vnemous View Post
    Bobby is that your motor or a customer? I might be looking to trade my drop on 300x for a 300xs.
    Its mine. Building it up for the c-hawk right now

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    Quote Originally Posted by 2jz View Post
    Coming from a automotive background I never liked the idea going one size over and the rest standard bore. I decided to try it and had no issues also heard guys with couple cylinder oversize with no issues.
    Inspect other pistons for wear and sticking rings if all fine I'd reuse them
    I know plenty that do and don't necessarilysee anything wrong with it... Some of who are very respected builders have suggested it. Just for some reason it seems wrong to me. Lol
    Last edited by RSWORDS; 04-26-2020 at 01:04 PM.

  8. #8
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    Quote Originally Posted by 282 View Post
    Mike whats difference in the x vs xs?
    Gas mileage is the big thing for me and about 20hp

  9. Likes Will hedrick liked this post
  10. #9
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    Worth it, you in Florida or up here?

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    Finished pulling it down to a bare block. Everything looks as expected, all the bearings are good (ill replace them anyway)

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    Pretty sure I can clean this one up on the bench grinder
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  12. #11
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    This should help

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  13. #12
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    Carried the block to the machine shop and 24 hours later we are fresh and ready.

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  14. #13
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    Bobby,
    That mota won't fit on the princess's 4 - Wheel drive monster truck …

    That 1194 sleeve has a couple area's that need a little TLC ..

    The start / stop tool path doesn't overlap when they cut the ports .. so you get these spikes in the corner's that really should get rolled back .
    Cell phone , pick's can be a little distorted ( or maybe it's my old eyes ) but make sure the machinist gave you enough chamfer on the rest of the port(s) …

    Motor looks sweet .. that one should be a lot of fun … faster Daddy faster ..



  15. #14
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    Quote Originally Posted by Chaz View Post
    Bobby,
    That mota won't fit on the princess's 4 - Wheel drive monster truck …

    That 1194 sleeve has a couple area's that need a little TLC ..

    The start / stop tool path doesn't overlap when they cut the ports .. so you get these spikes in the corner's that really should get rolled back .
    Cell phone , pick's can be a little distorted ( or maybe it's my old eyes ) but make sure the machinist gave you enough chamfer on the rest of the port(s) …

    Motor looks sweet .. that one should be a lot of fun … faster Daddy faster ..


    Yeah I saw them. I'm gonna do a little work.

    Annabelle asked if it was you I was talking to in the phone the other night. Lol

  16. #15
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    She is wise beyond her years ...

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