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Old 02-13-2013, 04:21 PM   #1231
wah64apache
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Originally Posted by wah64apache View Post
Auspuff it is an M5 with an estimate of 15 threads per CM. I say estimate because there are only 5 threads on it .
Cheers, Frank
I must have measured the wrong piece as Derek says it is M6 and he knows far more about this bike and carb. If I can find the picture book I was looking at. Cheers, Frank
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Old 02-13-2013, 04:29 PM   #1232
wah64apache
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Originally Posted by wah64apache View Post
I must have measured the wrong piece as Derek says it is M6 and he knows far more about this bike and carb. If I can find the picture book I was looking at. Cheers, Frank
Yep, I measured the idle jet, next to the main jet, not the fuel/air screw. Sorry for the error. Cheers, Frank
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Old 02-13-2013, 11:26 PM   #1233
Auspuff
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wah64apache & motolab - Many thanks for your kind efforts and lightning-quick responses to such an obscure question.
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Old 02-17-2013, 10:45 PM   #1234
slackmeyer
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Originally Posted by motolab View Post
The item is a cold start enrichment metering jet. It is normally located inside the upstream end of the cold start enrichment feed pipe (The cold start enrichment feed pipe is part of the float cage. The o-ring that isn't the float seat o-ring attaches to the downstream end). You should be able to push it back into its hole. If it won't stay, you can superglue or cylindrical parts bond it in (don't obstruct the hole in the process).

Regards,

Derek
In hunting around for a hard starting problem on my 640, I notice that this metering jet is absent from my enrichment feed pipe. Was it used on all bikes? If it was there, it must affect performance- what do I need to buy to get another one?
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Old 02-17-2013, 11:02 PM   #1235
motolab
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Originally Posted by slackmeyer View Post
In hunting around for a hard starting problem on my 640, I notice that this metering jet is absent from my enrichment feed pipe. Was it used on all bikes? If it was there, it must affect performance- what do I need to buy to get another one?
It's used on all BST40 carburetors. It's not available separately, so you'll need a new float assembly.

Regards,

Derek
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Old 02-17-2013, 11:07 PM   #1236
slackmeyer
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Originally Posted by motolab View Post
It's used on all BST40 carburetors. It's not available separately, so you'll need a new float assembly.

Regards,

Derek
Thanks, I'll give you a call about getting that assembly on it's way soon.
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Old 03-04-2013, 07:08 PM   #1237
rockscrambler
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hey guys i need some help figuring out where the vacuum lines on the right side of bst 40 (dr650) go (the side that says mikuni). i've figured out where the big 1/2" hose goes. but would like to know where the 1/4 " vacuum line that comes out the side of the carb goes?. this is a calif. model. the other line from other side of carb goes to petcock vacuum.
thanks in advance
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Old 03-04-2013, 07:17 PM   #1238
motolab
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but would like to know where the 1/4 " vacuum line that comes out the side of the carb goes?. this is a calif. model.
The hose you are referring to is not a vacuum line. It's a float bowl vent line, and on a California model would connect to a charcoal canister.

Regards,

Derek
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Old 03-04-2013, 07:30 PM   #1239
ER70S-2
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205'd by Derek

One of these:


Or this one:
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Old 03-04-2013, 07:39 PM   #1240
motolab
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Originally Posted by ER70S-2 View Post
205'd by Derek

One of these:


Or this one:
Unless I misunderstood rockscrambler's post, he had already identified the petcock vacuum line.

Regards,

Derek

P.S.: What's "205d" mean?
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Old 03-04-2013, 07:58 PM   #1241
theGrinch
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BST Carb parts order

Derek,
PMed you, could you give me a call?
Thanks,
Peter

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Old 03-04-2013, 08:20 PM   #1242
rockscrambler
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yes, its in the pic "one of these". and is the smaller vacuum line, do you know what that connects to on the other end? thanks guys!
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Old 03-04-2013, 08:43 PM   #1243
joefromsf
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Originally Posted by rockscrambler View Post
yes, its in the pic "one of these". and is the smaller vacuum line, do you know what that connects to on the other end? thanks guys!
It doesn't connect to anything. It vents to air and is routed inside the outer frame back past the battery. It ends just past the battery.
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Old 03-04-2013, 08:55 PM   #1244
ER70S-2
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It doesn't connect to anything. It vents to air and is routed inside the outer frame back past the battery. It ends just past the battery.
This one:


Goes here: Pay attention, the photos will mislead you. The 1st pic shows the hose goes to the left, the second shows the hose comes in from the left (backwards).
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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 03-04-2013, 08:57 PM   #1245
joefromsf
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Originally Posted by ER70S-2 View Post
That's what I get for trying to answer from memory. So it ends before the battery. I was right about venting to air though.
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