km9758
2nd Class Ticket
Posts: 1
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Post by km9758 on Jul 4, 2006 18:50:58 GMT
I have a 3 year old p2 disc that i have just fitted a hp4 lightened flywheel and scorpion exhaust too. I also changed the main jet to a 122 from a 116. All was good before I interfered now it seems to be running too rich. I've tried adjusting the mixture screw to no avail and when i take the air filter off you can see it spitting petrol back out the carb. Any ideas before i either take a large hammer to it for minor adjustments!  |
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Post by Smallframe on Jul 8, 2006 17:08:56 GMT
I ran 120 main with hp4 and sip pipe. When you say "rich" are you referring to the plug colour after doing a chop test or just a general feel the bike. All engines run differently so you need to ensure you go for the right mainjet to suit your motor and not one that is suggested as a benchmark. spitback is perfectly normal for rotary induction motors and an overlarge jet could possibly increase levels of spitback.
Give a good full throttle run andf chop test the plug. if its dark, try a 120, if thats dark try a 118 - you are aiming for a nice chocolate brown electrode.
PS
if your motor starts pinking at full throttle with the Hp4 flywheel then you may have to retard your timing by a degree.
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