[rossi]

Hi

Can some one start me in the right direction with jetting. As a recent 4 stroke convert, I have limited experience with 2 stroke jetting, other than getting my son's RM85 to run properly.

Bike: 2010 EC300 6 days, Gnarly pipe, just replaced the stock piston with Wossner kit, and cleaned out the top end which was a bit coked up. Left the base gaskets at 1.1mm to match the exhaust port height. I didn't have the correct thickness of solder so I haven't checked the squish yet, but I know that this bike has been maintained as stock rather than modified so it would probably benefit from being reduced.

Jetting is currently stock
38mm AS2
N1EF clip 1
MJ 165
PJ 35
#7 slide

Riding - Based in Cyprus. Anything from fire trails to real gnarly single track and dried river beds
Winter 15-20 deg C, 0-1000m
Summer 20-30+ deg C, 0-2000m
Humidity typically around 65%

I haven't ridden it since blowing the dents from the pipe and replacing the piston so the symptoms may have improved, but it was bogging at the bottom end, not pulling cleanly until PV opening. At 50:1 it was blowing unburnt oil out of the exhaust and smoking lots. I was advised to swap to 60:1 which cleaned up the exhaust but I would feel happier running 50:1 for a bit more engine protection. Plug was black and a bit oily.

I'm not looking for jetting perfection at the expense of regular adjustments due to temperature and altitude changes. Instead a good working setting that can cope with temperature and altitude changes, improve running and also fuel range.

Parts availability in Cyprus is a bit patchy so I will probably have to order in from UK or mainland Europe. So far I have tracked down suppliers who can send me standard Keihin needles and the Yamaha needles; I have drawn a blank on the Suzuki needles.

So can someone start me off with advice for a minimum order - a needle, couple of mains and pilots that will get me sorted.

Thanks in advance.