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  1. Chad

    How to rebuild your leaky or starving petcock

    This thread shows why this community is so valuable! Thanks and I encourage others to do the same when trouble shooting a repair. Thanks!!!
  2. Chad

    Low HP and slow throttle response

    Update! I finally found a guy in town that works on older asian bikes - and he was going to pick the bike up and do some testing for me yesterday. However the day before, I went back and: - re-checked valve clearance (not much adjustment needed) - adjusted the timing (this is where I gave up)...
  3. Chad

    Won't rev over 5000 rpm and how to test solid state reg

    OK so I have an update! Thanks RS Hutchinson... I finally found a guy in town that works on older asian bikes - and he was going to pick the bike up and do some testing for me yesterday. However the day before, I went back and: - re-checked valve clearance (not much adjustment needed) -...
  4. Chad

    Low HP and slow throttle response

    OK had a nice day and thought I'd dive back in. Before pulling the exhaust, engine, and so on to get at the chain, and before looking at the timing, I figured I would do a compression test. Remember that I completely tore down the head and valves and reassembled everything after finding the...
  5. Chad

    Won't rev over 5000 rpm and how to test solid state reg

    OK had a nice day and thought I'd dive back in. Before pulling the exhaust, engine, and so on to get at the chain, and before looking at the timing, I figured I would do a compression test. Remember that I completely tore down the head and valves and reassembled everything after finding the...
  6. Chad

    Won't rev over 5000 rpm and how to test solid state reg

    Wow thanks for the detail. Can't wait to try - will keep ya posted! Thx! Hope to do this soon!
  7. Chad

    Won't rev over 5000 rpm and how to test solid state reg

    Great info - couple follow ups before I roll up my sleeves - I am as frustrated as you were! This clarifies - because originally I thought you were saying you messed with the chain, but it was ATU adjustment that did the job. Going in order of what I need to do: 1) So how do I know the right...
  8. Chad

    Low HP and slow throttle response

    OK my bike had the issue of it idling great, but wont get up to speed or does so very slowly. Valve timing is dead on and I have synced carbs them and played with the idle mix screw some, but not too much. All my chats have led me to the fact that the ATU needs adjustment (other posts on this...
  9. Chad

    Won't rev over 5000 rpm and how to test solid state reg

    rshutchinson (and others) - Just did a head rebuild/valve replacement (81 XS foo special), and having the same issue as you describe - RPM limits (and throttle delay/clear lack of HP vs. what I had the day before I took the head off) - and went thru many of the same things you described. Of...
  10. Chad

    Low HP and slow throttle response

    Yea - I think Im gonna make a necklace out of it
  11. Chad

    Low HP and slow throttle response

    Thanks Hough. gonna do the timing next and check compression and plugs - will post. My only point was that my lack of compression was easily seen here and due to the cracked exhaust valve. True I could have ring issues (even bought them), but I was surprised how beautiful my 40 year old...
  12. Chad

    Low HP and slow throttle response

    The thumb screw is what I was referring to - sorry! I found it after I put in my carb - sitting on the left side of the engine housing below the choke...
  13. Chad

    Low HP and slow throttle response

    Good point on moving the pickup plate - but I can only move it like a couple degrees either way, right?... Any good threads on how to dial this in (sometimes i miss points!). Maybe we are onto something - it would explain a lot. I assumed automatic meant automatic! I know the cover had a nub...
  14. Chad

    Low HP and slow throttle response

    The coil has a notch in it and only fits on the cam one way- where the nub is - cannot be changed. Open to carb cleaning 101 advice or links if everyone believes that is the key. I just cannot understand how it was fine thru the day the valve broke, and looking for other causes before I dive...
  15. Chad

    Low HP and slow throttle response

    Thanks for the comments!! to your questions - one thing at a time: - No timing set. The 81 (and later) does not have points, but an electronic timing device that slides on a groove at end of crank shaft (see pic) so no way to screw that up - or so I have read. it is not showing me issues...
  16. Chad

    Low HP and slow throttle response

    So my 1981 XS400SH I have had 20 years (old reliable), got a crack in the manifold boot, ran lean and hot, melted a plug, and broke a valve. Now after a head rebuild and new valves and guides (and a new tank), and several valve adjustments, it idles great and roars when I get up to speed, but...
  17. Chad

    What is this part?

    So new member, priceless advice here rebuilding my 81 xs400sh - new head - and took it for 1st ride last night! Not perfect but close - gotta dial in the carbs I think. Question though is this: 2 days ago I put on my carbs and then gas tank and then was setting valves and I look down to...
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