mm700 jetting questions

N

Newfoundlander

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Joined
Oct 2, 2007
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101
Age
47
Location
Corner Brook NL Canada
I know this is the sx forum but since it is the same engine I thought you may have some input. I have a mm 700 that i put bender triple pipes on I am at sea level to 2000 ft and temperatures to -20 C I am running 52.5 pilots 150 mains and needles at 3 I have to bring the fuel screws out to 2 from 1.5 because it seems to stumble a bit on the bottom. I have checked and searched the forums and was wondering what everyone was setting there needles at mine seems a little on the lean side and was wondering if I should bump up the main a bit. Most of the time here we are at about -5C to -10 C during the winter months but can dip to -20 C a few times a year during the night according to the bender setup it should be good for -18C but I would appreciate some input from some of you that have used this setup for a while.
Thanks
 
Pilot controls idle to 1/4 throttle

Needle controls 1/3 to 3/4 throttle

Main controls 3/4 to full throttle

I would richen the needle and go one size up on the main. I would leave the pilot alone since you're never at the bottom very long
 
Same Sled and I am running 50 pilots, 150 main, 2 turns out, needles are 1/2 up from stock. I have been riding at -25celcius and I am not lean. I think I could probably go down to 147.5 but I am staying on the side of caution and expecting more cold temps.
 
I ran the 52.5 at 2 yesterday way to rich loaded plugs right away I'm going to drop the pilot back to 50's and try it at 2 turns I am thinking that should work. When I took the plugs out yesterday running 52.5 at 1.5 it was too rich also. how big a difference is there between 50's at 2 turns and 52.5 at 1.5 thanks
 
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