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mk2davis
03-11-2010, 03:54 PM
I'm trying to find out what the "correct" main jet size is? I know this is a loaded question, and I am taking a risk asking it, so let me give you a little background.

I bought my Benly after it was in storage at darn near sea level for 30 years. The main jet is 100. I also ordered a carb rebuilt kit, and the included main jet was a 92. I have no reason the think I'm too rich, and frankly I'd rather error on that side, so I kept the 100 in. I'm at 600-800 feet.

Ideas?

BenlyBoy
03-11-2010, 05:35 PM
By the parts book the standard main jet for a CA95 is #92. Standard main jet for the C95 is a #100. I have a pair of original C95 Benly's and the main jets are indeed #100.
While the above are the standard sizes, the parts book does list jet sizes #85 to #105 for the CA95, and jet sizes #90 to #110 for the C95. For tuning purposes perhaps?

mk2davis
03-12-2010, 08:28 AM
I thought the CA was the hotter motor; I'm surprised it uses the small jet. I think I'm going to stay with the 100, especially since I'm using a Uni airfilter. A sin, I know.

Sam Green
03-15-2010, 10:06 PM
The carbs did change over the years and the listing for both models in 1960 was 95 mains in both. I do know for a fact that my 65 C95 had 100.
It's not ultra critical for normal riding unless you live at altitude or are racing.
I have a full jetting chart for C92 C95 CB92 CB92R and CA95 as at June 1960.

Sam.;)

BenlyBoy
03-16-2010, 05:10 AM
I have read that the CA95 carbs had a power jet and the C95 carbs did not. Have never seen a CA95 carb, and the parts book does not list any thing like a "power jet". How does the power jet work? Would it affect the main jet size compared to the non-power-jetted C95 carb? :confused:

Sam Green
03-16-2010, 08:52 AM
The CB92 and CA95 both make power at 1000rpm higher than their C counterparts. The power and power air jets are to aid breathing at these extra revs.
These extra jets should not make any difference to the size of main jets.

Sam.;)