My new Commando race bike

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Bernd, do you have a link to a website that shows the rules for the race class in which you compete with your beautiful bike ?
 
Thanks for that, Bernd. It looks like a good series. Personally I'd like something similar to Battle Of The Twins but with a cut-off date at about 1990. I don't think I will ever have the opportunity to race against a field of old two valve twins such as aircooled Ducatis, Guzzis, Triumphs and BMWs. And I think that is very sad.
 
Can you show a photo and describe the shrunk on aluminum plate for the drive side case? How thick, interference fit etc.
 
I fitted a plate like that to one of my sets of cases. It was the same thickness as the step on the case (about 8mm ?), and a neat fit over the step. When it is welded, it must pull the crack together as it cools.
 
Neat bike, Bernd. I think you'll like the handling with the 25 degree rake and 100 mm trail. When I was racing my Commando PR (a few decades ago!), I helped my racing partner set up his Commando for AHRMA vintage racing. We settled on 24.5 degrees of rake and 102 mm of trail, and it worked very well. He was also on 18" tires. Quick to turn in, but still stable in high speed sweepers.

Ken
 
Here's a Dyno chart that Bernd sent me. As you can see it revved to about 8400 RPM. And this is a long stroke 850.

My new Commando race bike
 
It looks to slump a bit past 4000rpm when the mixture gets rich. Perhaps reduce the needle jet size to improve the trajectory for the midrange (or whatever adjustment appropriate for those carbys).
Ta.
 
needing said:
It looks to slump a bit past 4000rpm when the mixture gets rich. Perhaps reduce the needle jet size to improve the trajectory for the midrange (or whatever adjustment appropriate for those carbys).
Ta.
Click to expand...

luft/kraftstoff on the left side of the chart means air/fuel ratio. The rich area at 4500 to 6000 RPM could be because full throttle was applied and the motor leaned out as it revved up. In my current experiments its easy to run the CRS carbs lean in the mid range with the YY8 needle that Bernd is using - but this is at partial throttle settings and theady mid range RPM. The question is how to keep if from leaning out in the top end. Wide open is controlled by both the main jet and the air jet. Going to a smaller air jet is what I would try (instead of going to a larger main jet). To see if it makes the air fuel mix more consistent at the top of the RPM.

My new Commando race bike
 
Hi jseng1.
Re your "...The rich area at 4500 to 6000 RPM could be because full throttle was applied and the motor leaned out as it revved up..."
I have underlined the flaw in your logic.
Ta.
 
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