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Old 06-06-2013, 10:49 AM   #1336
motolab
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Quote:
Originally Posted by bradrh View Post
One other thing. The float and float/needle valve seem to be an assembly, not like the pictures shown at the beginning of this thread. Correct? Or should I try harder.
It is an assembly, however it can be taken apart for needle inspection. If the tip has a witness line where it has been contacting the seat (check with and without magnification), the float valve either leaks or will begin leaking soon.

Regards,

Derek
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Old 06-12-2013, 02:01 PM   #1337
ER70S-2
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Quote:
Originally Posted by bradrh View Post
One other thing. The float and float/needle valve seem to be an assembly, not like the pictures shown at the beginning of this thread. Correct? Or should I try harder.
You're correct. The carb shown at the beginning is out of a KTM and that's one of the most confusing differences.

Quote:
Originally Posted by motolab View Post
It is an assembly, however it can be taken apart for needle inspection. If the tip has a witness line where it has been contacting the seat (check with and without magnification), the float valve either leaks or will begin leaking soon.

Regards,

Derek
2004 DR650SE at 46,xxx miles:

Also at 46k:


Not my photo, showing the witness line:
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"BTW, I don't do style. It's a dirt bike, not some girlie dress-up thing." -
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Old 06-13-2013, 04:58 PM   #1338
laramie LC4 OP
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hey guys, i could use your help. this is a shameless request for your vote.

trying to win an intake system for my 990 and need your vote. please go to this THREAD and make a post for a vote with my member name.

thanks,

laramie
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Old 06-14-2013, 05:41 PM   #1339
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Quote:
Originally Posted by laramie LC4 View Post
hey guys, i could use your help. this is a shameless request for your vote.

trying to win an intake system for my 990 and need your vote. please go to this THREAD and make a post for a vote with my member name.

thanks,

laramie
Hey guys the Op is looking for a little help, only takes a minute. Anyone?
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Old 06-14-2013, 06:52 PM   #1340
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BTDT
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"BTW, I don't do style. It's a dirt bike, not some girlie dress-up thing." -
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Old 07-01-2013, 11:24 AM   #1341
wvrocks
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I'm slowly working my way through all 90 pages of the Bible. I recently bought a 2000 640 Adv and have some questions about my carb set up. There is a leak from the carb overflow if the bike is left to sit with the petcock and the bike will sometimes die if you chop the throttle coming to a stop, especially on downhills. It also bogs a bit right off idle. Idle is pretty smooth. Because of that I decided to tear into the carb and find out what the previous owners had done. I'm the 4th owner.

I've got a 147.5 main jet (142.5 was stock), 45 pilot fuel jet, Idle mixture screw is at 3.25 turns from bottom, the needle is in the 3rd slot and had a small shim under the metal washer so its effectively in the 3.5 slot. Slide is not drilled, spring appears to be uncut. The stock Supertrapp has been cored (rather sloppily) and has 8 discs and the center cap. The air box has been opened up a little by drilling 3 1.25" holes in the top between the snorkel and battery. The snorkel is still in place.

I live at 2000' and most rides are between sea level and 5000'. The bike runs ok as far as I can tell. Its my first KTM so I have nothing to compare it too. It won't lift the front wheel as easy as my 95 R1100GS would but has way better power than my 08 KLR did.

I believe my leak is a float adjustment problem, the rubber float weight tip is in good shape. I set the float by blowing into the fuel line and it looks like it was set too high. I'll know more once I get it put back together. Also thinking about backing the idle mixture screw down to 2.5 turns to see if that takes care of the off idle bog.

Do my settings look about right for my elevation? Any changes you would suggest? I'm adding a Stenhouse mixture screw to help with tuning. Thanks!
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wvrocks screwed with this post 07-03-2013 at 10:32 AM
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Old 07-01-2013, 12:27 PM   #1342
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These can cause running problems and should be replaced, ethanol doesn't help.

If the larger one leaks, fuel bypasses the float weight needle.

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Quote:
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"BTW, I don't do style. It's a dirt bike, not some girlie dress-up thing." -

ER70S-2 screwed with this post 07-19-2013 at 01:09 PM
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Old 07-01-2013, 12:35 PM   #1343
wvrocks
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Thanks, I'll check them out
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Old 07-01-2013, 10:00 PM   #1344
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Originally Posted by wvrocks View Post
Thanks, I'll check them out
The BST40 is different than that, the o ring is above the needle seat and yes it will fail and cause an overflow.
b
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Old 07-01-2013, 10:05 PM   #1345
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Originally Posted by bmwktmbill View Post
The BST40 is different than that, the o ring is above the needle seat and yes it will fail and cause an overflow.
b
It's the BST40 on a DR650SE.
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"BTW, I don't do style. It's a dirt bike, not some girlie dress-up thing." -
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Old 07-02-2013, 05:41 AM   #1346
wvrocks
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Yeah, mine is the KTM version. Only has the one o-ring on the float frame. Is there supposed to be an o-ring inside of the needle jet? There is one between the needle jet and the carb body, but not one inside where the float weight seats.
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Old 07-02-2013, 02:53 PM   #1347
laramie LC4 OP
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Originally Posted by laramie LC4 View Post
hey guys, i could use your help. this is a shameless request for your vote.

trying to win an intake system for my 990 and need your vote. please go to this THREAD and make a post for a vote with my member name.

thanks,

laramie
Thanks to those of you who have voted. I'm in the lead with 1 more day to go. Tightening up a bit, if you haven't had a chance to vote yet I'd sure appreciate it.

Thanks,

Laramie
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Old 07-02-2013, 08:46 PM   #1348
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Originally Posted by wvrocks View Post
Yeah, mine is the KTM version. Only has the one o-ring on the float frame. Is there supposed to be an o-ring inside of the needle jet? There is one between the needle jet and the carb body, but not one inside where the float weight seats.
Rocks, do you have the parts manuals?
b
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Old 07-02-2013, 09:16 PM   #1349
motolab
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Originally Posted by ER70S-2 View Post
If the larger one leaks, fuel bypasses the float weight.

Do you mean that if the larger one leaks, fuel bypasses the float valve?
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Old 07-02-2013, 09:24 PM   #1350
motolab
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Quote:
Originally Posted by wvrocks View Post
Is there supposed to be an o-ring inside of the needle jet?
No.
Quote:
There is one between the needle jet and the carb body, but not one inside where the float weight seats.
There is not supposed to be an o-ring between the needle jet and carb body. The nearest o-ring to the needle jet would be the one between the slide guide and the carb body. I have seen the term "float weight" used several terms in this thread, but am otherwise unfamiliar with the term.

Regards,

Derek
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