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Search: Posts Made By: motolab
Forum: Australia Today, 11:45 AM
Replies: 14,730
Views: 2,013,413
Posted By motolab
Could be true. They didn't say inverted in...

Could be true. They didn't say inverted in relation to what.

Regards,

Derek
Forum: Thumpers Today, 11:42 AM
Replies: 25,910
Views: 4,636,352
Posted By motolab
In my opinion this is a serious understatement. ...

In my opinion this is a serious understatement.

Regards,

Derek
Forum: Thumpers 02-26-2015, 12:08 AM
Replies: 6,771
Views: 1,230,245
Posted By motolab
The stock muffler flows poorly enough that...

The stock muffler flows poorly enough that opening up the intake with it still in place is a recipe for disaster in terms of detonation (even more so if not jetted correctly and/or if less than 91...
Forum: Thumpers 02-25-2015, 07:12 PM
Replies: 6,771
Views: 1,230,245
Posted By motolab
What is meant by airbox mod? Do you mean that it...

What is meant by airbox mod? Do you mean that it has the race lid installed, or has it been cut?

Regards,

Derek
Forum: Thumpers 02-25-2015, 04:32 PM
Replies: 6,771
Views: 1,230,245
Posted By motolab
You said it's an '06 model, right? What exhaust...

You said it's an '06 model, right? What exhaust system does it have? Is the snorkel installed? Does it have a stock airbox lid installed? What is the jetting? What octane was the fuel you were using?...
Forum: Thumpers 02-25-2015, 03:05 PM
Replies: 6,771
Views: 1,230,245
Posted By motolab
The broken ring and the scuffing on the...

The broken ring and the scuffing on the non-thrust side of the bore mean there was a detonation problem. You will need to find the cause and rectify it, or else this will happen again.

Regards,
...
Forum: Thumpers 02-24-2015, 02:04 PM
Replies: 210
Views: 49,279
Posted By motolab
Not a problem.I just checked one and it measured...

Not a problem.I just checked one and it measured 3.52 mm.CO stands for carbon monoxide, which is the portion of the exhaust gas whose level of content most strongly relates to mixture strength. If...
Forum: Thumpers 02-24-2015, 10:28 AM
Replies: 16,425
Views: 2,708,796
Posted By motolab
I don't know if I'd go that far.Didn't you say...

I don't know if I'd go that far.Didn't you say that the engine is capable of idling at 1300rpm while cold and with no enrichment?

Regards,

Derek
Forum: Thumpers 02-23-2015, 10:34 AM
Replies: 16,425
Views: 2,708,796
Posted By motolab
Clogged pilot jets are the usual suspects.BST...

Clogged pilot jets are the usual suspects.BST carburetors have cold start enrichment circuits instead of chokes. A choke is closed when an engine is cold and opened when it is warm, whereas a fuel...
Forum: Thumpers 02-22-2015, 02:12 PM
Replies: 16,425
Views: 2,708,796
Posted By motolab
It is possible (likely even) that the cold start...

It is possible (likely even) that the cold start issues are related to a generally lean idle mixture.

Make sure the float heights are set accurately to 14.6mm. Install fresh pilot jets (should be...
Forum: Thumpers 02-19-2015, 02:53 PM
Replies: 781
Views: 121,068
Posted By motolab
If the exhaust system clears the FCRMX...

If the exhaust system clears the FCRMX carburetor, then it will certainly clear the BST. There must therefore be reasons other than carburetor clearance for these two different systems to exist. It's...
Forum: Thumpers 02-19-2015, 01:23 AM
Replies: 781
Views: 121,068
Posted By motolab
I couldn't find this one at first. Turns out...

I couldn't find this one at first. Turns out there's a zero missing at the end.Very good to know. Thanks much!I must not qualify as such.

The system I have experience with is 586.05.007.000. It's...
Forum: Thumpers 02-18-2015, 11:37 AM
Replies: 781
Views: 121,068
Posted By motolab
I've never seen such a thing. Can you provide...

I've never seen such a thing. Can you provide pictures, links, or part numbers?

Regards,

Derek
Forum: Thumpers 02-18-2015, 12:53 AM
Replies: 781
Views: 121,068
Posted By motolab
Do you mean that there is an Akrapovič pipe meant...

Do you mean that there is an Akrapovič pipe meant for a BST40 carburetor and another meant for an FCRMX?

Regards,

Derek
Forum: Thumpers 02-17-2015, 10:12 PM
Replies: 30,294
Views: 3,763,147
Posted By motolab
Back the main jet out a bit and then hit it...

Back the main jet out a bit and then hit it squarely with a mallet. Remove the main jet, then drop one finger down the half-round portion of the slide guide and pull. The emulsion tube should come...
Forum: Thumpers 02-17-2015, 07:29 PM
Replies: 30,294
Views: 3,763,147
Posted By motolab
It can be had for less than that. Regards, ...

It can be had for less than that.

Regards,

Derek
Forum: Thumpers 02-17-2015, 07:06 PM
Replies: 30,294
Views: 3,763,147
Posted By motolab
It's part number 13551-14D00 and seems to be...

It's part number 13551-14D00 and seems to be available through normal channels.

Regards,

Derek
Forum: Thumpers 02-17-2015, 09:27 AM
Replies: 30,294
Views: 3,763,147
Posted By motolab
Why not just replace it? Regards, Derek

Why not just replace it?

Regards,

Derek
Forum: Thumpers 02-16-2015, 12:44 PM
Replies: 30,294
Views: 3,763,147
Posted By motolab
Remove the main jet and the slide, then the...

Remove the main jet and the slide, then the emulsion tube comes out toward the throat. Emulsion tube wear is sometimes not obvious without measuring. Another method is to spin the tube between your...
Forum: Thumpers 02-15-2015, 12:57 PM
Replies: 2,061
Views: 349,004
Posted By motolab
I think it's supposed to be 14.7mm when parallel....

I think it's supposed to be 14.7mm when parallel. I noticed that it isn't always, but at those times never paid attention to what it was instead.

Regards,

Derek
Forum: Thumpers 02-14-2015, 08:42 PM
Replies: 30,294
Views: 3,763,147
Posted By motolab
It is of course possible that a PO overtightened...

It is of course possible that a PO overtightened the bolt and that the hole stripped that way, but that may very well not be the case. The Japanese typically specify bolt grades and thread engagement...
Forum: Thumpers 02-14-2015, 08:23 PM
Replies: 30,294
Views: 3,763,147
Posted By motolab
The center air bleed jet is for the main circuit,...

The center air bleed jet is for the main circuit, while the one to the right is for the pilot circuit.

Regards,

Derek
Forum: Thumpers 02-13-2015, 08:44 PM
Replies: 6,771
Views: 1,230,245
Posted By motolab
What evidence do you have that the cold start...

What evidence do you have that the cold start enrichment circuit is operating properly?

If you adjust the idle mixture via the following method, how many turns out does the fuel screw end up at?
...
Forum: Thumpers 02-13-2015, 08:39 PM
Replies: 6,771
Views: 1,230,245
Posted By motolab
A leakdown test would reveal whether or not valve...

A leakdown test would reveal whether or not valve clearances could be the issue. Normally that's performed hot, but since the problem is with the engine cold, you could perform it cold.

Regards,
...
Forum: Thumpers 02-13-2015, 02:01 PM
Replies: 6,771
Views: 1,230,245
Posted By motolab
How many miles are there on the carburetor and...

How many miles are there on the carburetor and what did the overhaul consist of?BST40 carburetors have cold start enrichment circuits instead of chokes. A choke is closed when an engine is cold and...
Forum: Thumpers 02-12-2015, 08:18 PM
Replies: 210
Views: 49,279
Posted By motolab
Great!You would need an unmodified spacer.Plug...

Great!You would need an unmodified spacer.Plug the one on the right (the one on the left is the original one). You can use epoxy for this. People have also used set screws, but you have to figure out...
Forum: Thumpers 02-09-2015, 01:31 PM
Replies: 210
Views: 49,279
Posted By motolab
With the 6F19 needle, you would use the white...

With the 6F19 needle, you would use the white spacer. The DJ instructions say not to use it (that's one of the many problems with that needle). I don't know about the JD needle. The Factory Pro...
Forum: Thumpers 02-09-2015, 12:17 PM
Replies: 6,771
Views: 1,230,245
Posted By motolab
Good question!Agreed! Regards, Derek

Good question!Agreed!

Regards,

Derek
Forum: Thumpers 02-08-2015, 11:12 PM
Replies: 210
Views: 49,279
Posted By motolab
I made a mistake here and grabbed a 6F10 needle...

I made a mistake here and grabbed a 6F10 needle instead of a 6F23 by accident. And I'm afraid I don't have a 6F23 to measure just now. Sorry about that!

Regards,

Derek
Forum: Thumpers 02-08-2015, 10:45 PM
Replies: 6,771
Views: 1,230,245
Posted By motolab
Have a look at: ...

Have a look at:

https://i.imgur.com/WFerGXI.jpg

I hope they help...

Regards,

Derek
Forum: Thumpers 02-08-2015, 11:50 AM
Replies: 210
Views: 49,279
Posted By motolab
No problem.Yes, the Zebra did a great job.If the...

No problem.Yes, the Zebra did a great job.If the snorkel is pulled, the main jet should probably be one size larger than stock.I hope you can get that to work.I'll look forward to hearing how it...
Forum: Thumpers 02-08-2015, 02:09 AM
Replies: 210
Views: 49,279
Posted By motolab
I have yet to try any of their stuff in earnest...

I have yet to try any of their stuff in earnest (JD did send me some of his needles to try in a application they weren't really designed for - they weren't the shape I was looking for, so I wasn't...
Forum: Thumpers 02-07-2015, 10:39 PM
Replies: 6,771
Views: 1,230,245
Posted By motolab
The service manual provides a charge current test...

The service manual provides a charge current test procedure, which may give additional clues.One could certainly test when cold and when hot. Since there is no specification in the manual for this, I...
Forum: Thumpers 02-07-2015, 09:38 PM
Replies: 210
Views: 49,279
Posted By motolab
That's an interesting little tidbit of...

That's an interesting little tidbit of information.I don't recommend the DynoJet needle because:

1) It's tapered unnecessarily sharply and is likely to produce a significant variance in...
Forum: Thumpers 02-06-2015, 09:30 PM
Replies: 210
Views: 49,279
Posted By motolab
Could it be a U.S. model?It's probably a 6F23...

Could it be a U.S. model?It's probably a 6F23 (which will be stamped into it toward the top).Be aware that shimming the needle clip will indeed richen the mixture, but (except when the slide is...
Forum: Thumpers 02-06-2015, 12:22 PM
Replies: 210
Views: 49,279
Posted By motolab
That looks like it's probably a Kientech. ...

That looks like it's probably a Kientech.

Regards,

Derek
Forum: Thumpers 02-06-2015, 11:53 AM
Replies: 6,771
Views: 1,230,245
Posted By motolab
I'm perfectly fine with not posting about it...

I'm perfectly fine with not posting about it anymore.

Regards,

Derek
Forum: Thumpers 02-06-2015, 11:36 AM
Replies: 6,771
Views: 1,230,245
Posted By motolab
That's easy. In order for there not to be...

That's easy. In order for there not to be stiction beyond what's normally caused by seals, wipers, and parts just resting against each other, interference must be less than or equal to zero.

MSH...
Forum: Thumpers 02-05-2015, 10:37 AM
Replies: 6,771
Views: 1,230,245
Posted By motolab
I have not, and I don't think it's necessary. If...

I have not, and I don't think it's necessary. If it was, the engineering process would be incredibly tedious because the implication is that no building on previous experience would be allowed. In...
Forum: Thumpers 02-04-2015, 10:43 AM
Replies: 6,771
Views: 1,230,245
Posted By motolab
I've been really puzzled by your insistence that...

I've been really puzzled by your insistence that I'm making guesses. I hope you aren't offended, but I'm wondering if it may have something to do with differences in experience with what certain...
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