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Search: Posts Made By: motolab
Forum: Thumpers Yesterday, 06:35 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
One thing that needs to be understood about crank...

One thing that needs to be understood about crank spread is that it's not even. In other words, the cheeks of the crank spread opposite the crank pin, while they pretty much stay put by the crank...
Forum: Thumpers Yesterday, 05:03 PM
Replies: 4,112
Views: 469,603
Posted By motolab
The petcock should indeed shut the fuel off when...

The petcock should indeed shut the fuel off when the engine is not running. That it doesn't means there's something wrong with it. There are seals and o-rings inside that cause fuel to continue to...
Forum: Thumpers Yesterday, 01:53 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
If the front end is completely collapsed,...

If the front end is completely collapsed, yes.Imagine the fork tube and the fork slider centerlines. Coaxial means that these two center lines are one and the same. The ways that they could deviate...
Forum: Thumpers Yesterday, 12:52 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
I can see how using angular contact bearings...

I can see how using angular contact bearings might help prevent the crank from spreading, but I don't understand how it would help prevent big end bearing failure. And how will the thermal expansion...
Forum: Thumpers Yesterday, 10:20 AM
Replies: 6,567
Views: 1,199,698
Posted By motolab
Where do the shims go? Regards, Derek

Where do the shims go?

Regards,

Derek
Forum: Thumpers Yesterday, 10:17 AM
Replies: 754
Views: 117,239
Posted By motolab
I've tested both <!--[if gte mso 9]><xml> ...

I've tested both <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:DoNotOptimizeForBrowser/> </w:WordDocument> </xml><![endif]-->Akrapovič and Remus full...
Forum: Vendors 01-22-2015, 07:44 PM
Replies: 89
Views: 22,670
Posted By motolab
Wayne, you're welcome! Regards, Derek

Wayne, you're welcome!

Regards,

Derek
Forum: Thumpers 01-22-2015, 06:04 PM
Replies: 182
Views: 45,066
Posted By motolab
Have a look at...

Have a look at http://advrider.com/forums/showthread.php?t=528038.

Regards,

Derek
Forum: Thumpers 01-22-2015, 11:56 AM
Replies: 6,567
Views: 1,199,698
Posted By motolab
It is not possible for you to understand geometry...

It is not possible for you to understand geometry and engineering and simultaneously not understand "where my numbers came from".Agreed.Agreed! If someone is OK with fork stiction and accelerated...
Forum: Thumpers 01-22-2015, 11:27 AM
Replies: 6,567
Views: 1,199,698
Posted By motolab
An engineering background should not be required....

An engineering background should not be required. This is basic geometry, which is likely to have been covered in elementary school.

Regards,

Derek
Forum: Thumpers 01-22-2015, 10:21 AM
Replies: 4,112
Views: 469,603
Posted By motolab
BST40 carburetors have cold start enrichment...

BST40 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 enrichment circuit is opened when the...
Forum: Thumpers 01-22-2015, 10:14 AM
Replies: 6,567
Views: 1,199,698
Posted By motolab
I did that in several of my previous posts, and...

I did that in several of my previous posts, and it seemed to me that those where not being comprehend. Hence I thought some examples with numbers might help.Taking each example, looking at and...
Forum: Thumpers 01-22-2015, 10:08 AM
Replies: 6,567
Views: 1,199,698
Posted By motolab
I made an error in that I did not subtract out...

I made an error in that I did not subtract out the clearance from the amount the alignment would be out from coaxial in order to get how much interference there would be. In other words, the figures...
Forum: Thumpers 01-21-2015, 11:39 PM
Replies: 2,059
Views: 340,573
Posted By motolab
Only the KTM manual says to set the seam parallel...

Only the KTM manual says to set the seam parallel to the gasket surface, and if a person insisted on following that, your instructions would be correct. The Aprilia Moto 6.5 and Husqvarna TE 610E...
Forum: Thumpers 01-21-2015, 11:17 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
Let's assume that you follow the service manual's...

Let's assume that you follow the service manual's instructions, that the fork bushing clearance is .004" (0.1 mm), and you manage to compress the fork half way by "bouncing hard". That means there...
Forum: Thumpers 01-21-2015, 09:46 PM
Replies: 4,112
Views: 469,603
Posted By motolab
The carburetor's slide guide, and emulsion tube...

The carburetor's slide guide, and emulsion tube have a tendency to wear, causing a low rpm rich condition across most throttle openings. Have a look at...
Forum: Thumpers 01-21-2015, 09:34 PM
Replies: 2,059
Views: 340,573
Posted By motolab
That would have been dangerously lean with the...

That would have been dangerously lean with the whole top of the airbox cut off as it was.In my experience that would usually be the right size unless the bike is ridden at high altitudes, at which...
Forum: Thumpers 01-21-2015, 09:27 PM
Replies: 2,059
Views: 340,573
Posted By motolab
There appear to be some airboxes with snorkels on...

There appear to be some airboxes with snorkels on Ebay.

Regards,

Derek
Forum: Thumpers 01-21-2015, 09:26 PM
Replies: 2,059
Views: 340,573
Posted By motolab
Does the slide have any vertical grooving on the...

Does the slide have any vertical grooving on the downstream side? Has the slide spring been clipped? The image is too small for me to be able to tell.

There are six depressions in the face of the...
Forum: Thumpers 01-20-2015, 01:39 PM
Replies: 2,059
Views: 340,573
Posted By motolab
I recommend replacing the airbox. Regards, ...

I recommend replacing the airbox.

Regards,

Derek
Forum: Thumpers 01-20-2015, 12:40 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
The specification being discussed in the article...

The specification being discussed in the article relates to how much the tubes may splay. What we are talking about here is how coaxial the tubes and sliders are once the axle's pinch bolts are...
Forum: Thumpers 01-19-2015, 06:12 PM
Replies: 2,059
Views: 340,573
Posted By motolab
The carburetor must be verified to be in the...

The carburetor must be verified to be in the proper condition before thinking about tuning.I don't see a picture, but if it's the opening in the top of the airbox you're referring to, the size sounds...
Forum: Thumpers 01-19-2015, 05:52 PM
Replies: 2,059
Views: 340,573
Posted By motolab
It's probably easier to just call the jet in...

It's probably easier to just call the jet in question a Mikuni large round style, or a N100.604.I can't vouch for the accuracy of the chart, but volume should be volume.I wouldn't worry about those...
Forum: Thumpers 01-19-2015, 01:53 PM
Replies: 2,059
Views: 340,573
Posted By motolab
That's a conspicuous demonstration of just how...

That's a conspicuous demonstration of just how restrictive the arrestor is.In my experience the 5th position will be a touch rich if the correct main jet has been installed.Richer definitely reduces...
Forum: Thumpers 01-19-2015, 01:38 PM
Replies: 2,059
Views: 340,573
Posted By motolab
In my opinion the float should be set by height,...

In my opinion the float should be set by height, not by whether something is parallel to something else.

When the correct main jet is installed for high RPM WOT operation after having removed the...
Forum: Thumpers 01-16-2015, 04:30 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
Valve lash having a range is not analogous. ...

Valve lash having a range is not analogous.

Since bushing clearance is not zero, even the method I'm advocating will not guarantee perfect alignment, but it will guarantee centers that are close...
Forum: Thumpers 01-16-2015, 11:07 AM
Replies: 6,567
Views: 1,199,698
Posted By motolab
Sounds like a combination of argumentum ab...

Sounds like a combination of argumentum ab auctoritate and argumentum ad populum.

Unfortunately if there isn't maximum overlap, then the "place the fork was trying to move to" is a range...
Forum: Thumpers 01-16-2015, 10:38 AM
Replies: 6,567
Views: 1,199,698
Posted By motolab
"Take the motorcycle off the stand and bounce the...

"Take the motorcycle off the stand and bounce the fork hard a few times to align the fork legs" is the portion of these instructions that can be improved upon.

Regards,

Derek
Forum: Thumpers 01-15-2015, 03:35 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
I think it leaves too much to chance and...

I think it leaves too much to chance and therefore cannot even rightfully be called a method.

Regards,

Derek
Forum: Thumpers 01-15-2015, 09:58 AM
Replies: 6,567
Views: 1,199,698
Posted By motolab
I agree with you on this 100% in principle. But...

I agree with you on this 100% in principle. But then I do wonder how critical it can really be when it seems to be common practice to use differing spring rates on both legs to split the difference...
Forum: Thumpers 01-14-2015, 07:07 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
The Key difference is, "Wiggle the left leg back...

The Key difference is, "Wiggle the left leg back and forth on the axle. You will see that it seeks its center or zero point", which I think you can agree will not really center the fork slider (or...
Forum: Thumpers 01-14-2015, 04:27 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
Unless the oil was just sloshed around for some...

Unless the oil was just sloshed around for some reason, there shouldn't be that much up that high on the springs.

Regards,

Derek
Forum: Thumpers 01-14-2015, 03:42 PM
Replies: 6,567
Views: 1,199,698
Posted By motolab
Absolutely.Two questions: 1) If oil were to...

Absolutely.Two questions:

1) If oil were to come out using this technique, how could I use it any time I loosen an axle clamp (and considering how often that must be, since I work on motorcycles...
Forum: Thumpers 01-13-2015, 02:06 PM
Replies: 182
Views: 45,066
Posted By motolab
Considering that needle diameter changes as small...

Considering that needle diameter changes as small a .0005" can (and do) register as a change in CO% in gas analysis on the dyno, it's probably a better idea to just replace the needle.

Regards,
...
Forum: Thumpers 01-12-2015, 09:11 PM
Replies: 182
Views: 45,066
Posted By motolab
I'm glad to hear that you got it solved. ...

I'm glad to hear that you got it solved.

Regards,

Derek
Forum: Thumpers 01-12-2015, 08:36 AM
Replies: 182
Views: 45,066
Posted By motolab
If the carburetor is in good condition (float...

If the carburetor is in good condition (float system in order, no clogged jets, emulsion tube not worn out), all that's needed is for the float height to be set correctly, a non-USA adjustable OEM...
Forum: Thumpers 01-11-2015, 09:21 PM
Replies: 2,059
Views: 340,573
Posted By motolab
A 165 main jet will be too large with the lid in...

A 165 main jet will be too large with the lid in place and the snorkel removed. That said,the pre-high flow head models are significantly prone to detonation even in stock form. Unless significant...
Forum: Thumpers 01-11-2015, 12:58 PM
Replies: 2,059
Views: 340,573
Posted By motolab
Anything that restricts exhaust flow will...

Anything that restricts exhaust flow will increase detonation risk while anything that improves exhaust flow reduces detonation risk.BST40 carburetors have cold start enrichment circuits instead of...
Forum: Thumpers 01-11-2015, 11:34 AM
Replies: 2,059
Views: 340,573
Posted By motolab
If it's a genuine Mikuni jet, it will have the...

If it's a genuine Mikuni jet, it will have the square-within-a-square Mikuni symbol stamped into it like so:

http://i1167.photobucket.com/albums/q630/goeway2012/Motohorseman/CIMG2697.jpg

The...
Forum: Thumpers 01-11-2015, 11:17 AM
Replies: 6,567
Views: 1,199,698
Posted By motolab
That makes sense. I'd remove the fork caps,...

That makes sense. I'd remove the fork caps, collapse the front end, and loosen and then retighten all of the pinch bolts on the axle and triple clamps. At max overlap, everything will align as well...
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