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1978 XS400 Tracker Build

Discussion in 'The Garage' started by P1ENDL49, Jun 29, 2015.

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  1. P1ENDL49

    P1ENDL49 XS400 Member

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    NW Iowa
    Since this is my first post I just wanted to say hello. I just picked up a 1978 XS400 to build. I really want it to be a sort of desert sled tracker type bike. The bike didn't run when I got it but after a carb cleaning I got it running ok. It starts to cut out around 5,000 rpm but is fine before that. I plan on cutting mufflers off and putting universal type baffles and some sort of tips off the headers, and pod filters. I know I'm going to have to go up jet sizes, but my fuel pilot jets are both stripped so any ideas for getting them out would be greatly appreciated. I'll kept posting as my progress comes along.
     
  2. sproutroot

    sproutroot XS400 Member

    Get it running well before you do your cutting/modifying; especially in regards to intake/exhaust. The farther you get from stock, the harder it is to solve problems like yours. Don't let your cool ideas turn into a big headache :banghead:
    Not sure what your background is, but these are relatively simple machines and now that you've joined the forum you've got tons of info at your fingertips. Dialing it in now is likely to be both straightforward and rewarding.
    Post pictures! We wrenchers are attracted to stories with a high picture:word ratio :popcorn:
    Finally, welcome to the forum! Good luck and have fun :bike:
     
  3. P1ENDL49

    P1ENDL49 XS400 Member

    8
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    NW Iowa
    Well I had a big setback. The PO stripped out pilot fuel jets. Before I did any research, I used an easy out which cracked the aluminium:banghead:

    So here is my question. I'm getting rid of the bs carbs and want to get a set of mikuni vm's. I've heard that I need to go smaller then a 34, maybe even a 30 to get the air flow right. What would be the best carbs to switch to? Id like to find one that is still in production so parts are easier to find...and of course works with the bike.
     
  4. P1ENDL49

    P1ENDL49 XS400 Member

    8
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    NW Iowa
    Here are some pictures of it when I got it, after I cleaned it up, and during teardown. And hopefully what it'll look close to when done.
     

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    Last edited: Jul 4, 2015

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