Tuning a Darmah

peaky · Post by **peaky** » Thu Jan 25, 2007 1:06 pm

I have a 78 SD with stock carbs. The previous owner fitted K&N cones and a Conti replica exhaust. With this set-up, what should the jetting be at?

Thanks!

Den · Post by **Den** » Mon Jan 29, 2007 9:14 am

What is the jetting now? Needle, atomizer, mains, pilots, slide. And carb size (32mm or 40mm).

machten · Post by **machten** » Tue Jan 30, 2007 8:14 pm

I have a totally stock 78 SD other than it is fitted with Conti's. So it currently has 32mm PHF's running through the stock air boxes and the cylinder size is original. I have run this with K & N's and Contis in the past. All jetting, needle positioning etc was the same - ie as per the SD 900 parts list available on Steve's site. I think I may have needed some very minor adjustment to idle & mixture screws to compensate for any different air flow characteristics (not something to be attempted without some knowledge or research into carb synching!!! - see elsewhere on this site), but that was all, and it seemed to run fine.

Post by **BevHevSteve** » Tue Jan 30, 2007 8:49 pm

I find that you *might* need to go 1 step richer main, and you MIGHT need to go a half step on the needle [raise] with a stock engine.

peaky · Post by **peaky** » Wed Jan 31, 2007 6:16 pm

The bike is bone stock right now on the jetting and the settings. Has 32s but I might go to guzzi 38s or bmw 40s. It runs great (thanks to your fine balancing advice) but hey, I'm a 2 stroke guy so when pipes and filters get played with, I get concerned. Wanna see my holed piston ashtray collection?