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My 1990-2003 XT600E mods My 1990-2003 XT600E mods
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 23 Jun 2009
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Lol, forgot to post the pictures xD

here they are...

They don't appear to be that much longer than the grizzly's 660 one..
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Old 23 Jun 2009
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its longer than stock when you include the carb mounting stub, plus its slap bang in the middle which means it has clearance issues with the top of the carb it will be in line with the spine of the frame
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Old 26 Jun 2009
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Hey guys!

Does anyone have BST40 have a choke plunger laying around?
The carb I bought doesn't have one so I need to get one..

I know the LTZ has a Mikuni BSR38mm and I've found one choke plunger that looks exactly what I'm looking for but dunno if it'll fit... it's on flebay for 15bucks..
Do you guys know/think it'll fit on the BST40?

My other problem is... throttle cables! this carb came from a KTM640 SM but will the throttle cables from a DR650 work with it, are the cables exactly the same?
what other bikes have this same carb?

@ wolf I've also been posting on advrider and one of the guys mentioned some KTM linkless swingarm

Those KTM swingarms, the shock mount points are offset to the right and will probably help out with this carb setup, what do you think?

They also mention that KTM rear shocks have a large veriaty of shock spring rates but I'm concerned about the possible height change :S

I guess that since I already have most parts of the YZ rear end I'll just try to see what I can come up with... if it doesn't work on the XT I'll try the parts on my 2002 DT125R or just end up selling the whole thing...


Ideas?

Vando
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Old 26 Jun 2009
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your bargain carb doesn't sound much of a bargain i'd hazard a guess that it has a cable choke so thats why its missing so maybe you need all the ktm throttle and choke controls.
the spring rates will be the least of your worries if you move the top mounting back you wont be able to use the air box which actually holds the battery in place too.
linkages are a pantograph allowing more movement with less linear travel as i have said before the linkage will have an affect on rate of spring required or lack of linkage in the case of the ktm.
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Old 27 Jun 2009
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I'm all forward to getting rid of my stock airbox! It's a huge pile of nothing! lol
It has actually been one of the things I wanted to get rid off and just put two of those conical airfilters untill I found out it would mess up the jetting..

I've asked here or on advrider and one of the guys said he could send me some internal measures and drawings/pictures of his DR650 airbox so I can make own in fiberglass that fits way better and holds everything nice and clean as Yamaha should've done in the first place..


The choke parts are actually cheap on BikeBandit and the throttle, I will try to use my XT's with a little adapter or something like that....If that doesn't work I'll just wait around patiently I will find one on flebay sooner or later..


Could you explain me a bit more how exactly the linkage and suspension actually works?
This is something really interesting!

Vando
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Old 27 Jun 2009
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air boxes are actually quite important they allow the induction system to draw the correct volume of still air through the venturi of the carb to give a proper mixture.
read up on suspension for yourself its too complicated to put in a forum post read this one first then research from the info given on that

Car Bibles: Motorbike suspension types and how they work.
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Old 1 Jul 2009
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Hey there..

@Wolf
I've read the website you postedf and now I understand the principles of the linkage..

Do you think an early XT longer rear shock will give me the little extra height I'm looking for to "match" the front forks?

OR

I guess that would allow me to mount the fork a little behind on the frame to give me more space for the carb, no?


Updates:
  1. - Got my carb a couple of days ago! it looks great!
  2. - Bought that Y-carb joint boot for 18.99USD with shipping (the same here in Portugal is almost 170€ with taxes and shipping)
For the carb I still need:
  • The small rubber boot that links the Y-joint to the carb..
  • will buy the throttle grip with cables from a KTM LC4 640 just in case the XT's cables won't work with the carb
  • And the choke plunger is still missing
I know that the 1990 DR650 carb (also a Mikuni BST40) had the choke plunger I'm looking for but I'm afraid that Mikuni might have changed something since 1990???

I also know the choke plunger off the DR350 will fit the DR650 carb but I have yet to find out what differences the Mikuni BST40 has from make to make (mine is Mikuni BST40 but from a KTM LC4 640)

HELP!!

Vando
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