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Author Topic: xs650 Sumotrack  (Read 17876 times)

Offline Rat_ranger

  • Posts: 261
Re: xs650 Sumotrack
« Reply #170 on: Jun 14, 2018, 23:55:05 »
Ok, so I got a few heat cycles on the engine and retorqued the head.  I also replaced a cam seal while I was at it, one decided it didn't want to do its job.  I'm slowly getting some tuning done, I synced the throttle bodies today, and started fiddling with the fuel and ignition map as quick throttle move would cause a stumble.  i wish there was a better selection of smaller throttle bodies, I really think this engine would be happier with 31-32mm throttles instead of 38mm.
Xs650

Offline crazypj

  • Posts: 12950
  • Split personality, I fake being smart
Re: xs650 Sumotrack
« Reply #171 on: Jun 15, 2018, 11:22:31 »
I doubt the modern 250/300/350 singles/twins are available except as OEM which would make them very expensive? The no idea of throttle bore on MX 250's? May be bit smaller?
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline Rat_ranger

  • Posts: 261
Re: xs650 Sumotrack
« Reply #172 on: Jun 15, 2018, 12:19:44 »
I think the cbr250/300 is a 40mm.  Plus the singles would take more machine work and thought to link properly.  I know the gpz1100 and the kz750 turbo had 31 or 34mm, but it would take adapters to fit standard injectors.  I might try making a "choke" like the side draft webers use to bring the bore down to 32 or 34mm.  I have the center bodies from the rack I can experiment on. 

Also it takes a good bit more fiddling when there are no base maps available. 
Xs650

Offline crazypj

  • Posts: 12950
  • Split personality, I fake being smart
Re: xs650 Sumotrack
« Reply #173 on: Jun 15, 2018, 19:23:08 »
I was thinking along lines of TU250 Suzuki
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline Rat_ranger

  • Posts: 261
Re: xs650 Sumotrack
« Reply #174 on: Jun 15, 2018, 20:25:38 »
It is a good size, but linking a pair doesn't look very easy.  Also with how the injector mounts there probably aren't many higher flowing ones that'll fit.
Xs650

Offline Rat_ranger

  • Posts: 261
Re: xs650 Sumotrack
« Reply #175 on: Jun 17, 2018, 02:46:05 »
Well I have a headlight and speedometer now.  The number plate will be painted once I'm fully happy with it.  The light staryed as a generic ebay LED projevtor with high/low and angel eye.  As you can tell, I'm not a fan of angel eyes, so the light was modified.  The speedo is an inexpensive 60mm gps speedometer with built in antenna. 
Xs650