R65 at the Dyno Day.

[Silk]

I took my bike up to Auckland for a dyno day that was running. I tried a couple of exhausts, the 2 into 1 with a Supertrapp that I normally use, and a twin pipe system that cuts out the stock collector box, with a couple of short reverse megas. Carried the other system in my panniers. Confirmed my seat of the pants - the 2 into 1 made more top end, the twin pipes more mid range. The stock torque curve has max torque at 3,500rpm, and pleased that my system kept that, also they have a torque dip between 4,000 and 5,000rpm, and that's shifted to 5,000 to 6,000rpm. That would explain why it's more economical too, cruising between 4,000 and 5,000. What was surprising is that he says it's too rich, and leaning it out should lift that dip...then the torque curve would be almost flat. Normally if you fit a more free flowing exhaust you need to go up in jetting, not down. New jets coming.

 

[ZeeOSix]

Nice flat torque curve which results in a nice linear HP curve (except for the slight dip which you'll fix with proper tuning).

 

[Superflan]

Frequently when tuning small engines, got to go down on jets with free flowing exhausts AND intakes. From a different perspective, it doesn't surprise me from a carburated engine where fuel is drawn by depression

 

[HerrStig]

Love those Bings. Did yours come with the air injection pipes from the air filter box to the cylinder heads? Mine ahhhhhh "fell off".

 

[Langanobob]

Nice bike. Would be interesting to see how the torque curve would respond to adding or removing disks in the Supertrapp.

 

[BrocLuno]

Nice bike, good day

Where's the R90/5

 

[CT8]

That is such a nice bike.

 

[Silk]

I could've spent all day playing with discs and endcaps, blocking and unblocking the balance pipe, intake snorkels etc. But each run cost money, so 2 runs was my budget and I got what I wanted. You can't go around playing with things and saying it's better, you need to see the results.

No emmision hoops to jump though here, so we got no extras. I have removed the breather pipes that lead into the carbs, and run the breather into an intake snorkel, I use a K&N filter, so any oil that comes through won't be a problem.

 

[Silk]

Someone got a video of the first run.

 

[Shannow]

Nice Silk.