Yamaha Xs500 twin tune-up help
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Yamaha Xs500 twin tune-up help

This is a discussion on Yamaha Xs500 twin tune-up help within the Technical forums, part of the Caferacer.net Forums category; Hey guys, new here bought a cheap bike recently to transform into a cafe, but ran into some difficulties. I just got my bike running ...

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  1. #1
    Lioncoeur's Avatar
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    Jun 2009
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    Yamaha Xs500 twin tune-up help

    Hey guys, new here bought a cheap bike recently to transform into a cafe, but ran into some difficulties. I just got my bike running yesterday ('76 Yamaha xs500). I've rebuilt the carbs since purchasing it but haven't done the valves, timing etc. Just took it for its first spin yesterday. It seems to rev fine up to at least 4k (I didn't push further) when sitting at a stop, but when I put the bike under load, that is, try and accelerate away from a stop, the engine stubbles and hesitates above about 2500 rpm. I can push it above but it has no power and runs terribly. But the moment I come to a stop and rev the engine, it'll push past 4k no problem.

    I'm new to working on engines, so if this seems something really simple and stupid, my apologies in advance.

  2. #2
    Senior Member BB73's Avatar
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    Feb 2009
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    Livonia, Michigan, USA.
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    191
    Check your points gap and timing.

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