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Post by beemerman on Aug 11, 2013 12:56:29 GMT
Hi I'm about to drill the two holes in my air filter just waiting for it to dry after cleaning it I run it with a sito plus after looking at the main jet it is 100 do I need to go bigger and if so how big
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Post by fredperrybruce on Aug 11, 2013 20:54:17 GMT
Hi,
Take it for a spin, find a nice long stretch of road,
To check the main jet, which operates from 1/2 to full throttle, get the scooter up to a steady full throttle or near to it for a good few seconds, then simultaneously pull in the clutch and kill the engine. Don't let the motor drag you to a stop, or fall to an idle, because you want to isolate the plug colour at full throttle.
Get off and check the sparkplug colour. It should be a light chocolate color. If it's white, the air/fuel mixture is too lean and you need a bigger main jet. If it's black or really dark brown, the air/fuel mixture is too rich and a smaller main jet is needed. If you need to change jets, change by one size, and do another run.
If you have a 100 in there that sound's about right!! "BUT" every engines different so have a play........ Be careful doing a plug chop
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Post by sbwnik on Aug 11, 2013 23:13:38 GMT
104-ish with a Sito and drilled filter.
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Post by beemerman on Aug 12, 2013 12:18:16 GMT
cheers for your help guys that really is informative i will be giving this a go hopefully this week if her in-doors hasnt planned me to do man stuff around the house
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