Question about Spark plugs color and mixture screws
I put new spark plugs in and rode down the road in 4 th gear about 5,000 rpm for a few miles pulled the clutch , flipped the kill switch and rolled to a stop. I was looking for the golden brown look after seeing the spark plug chart and they looked a little white or grey . I'm 200 ft above sea level and running the stock 152.5 main jet and stage 7 needle 3rd clip from the blunt end, Morley air box/kit , Marks exhaust and I was at 2 turns out on my screws which don't really feel too lean but feels very crisp and pulls very good. I just wonder if the plugs are too new to read accurately . Do I need to ride longer on these plugs to get a more accurate reading ? I then turned them all out a half a turn more and rode home because it was almost dark and the bike just don't run as crisp. Also the bike i have has the old 3 stage v boost switch where you can flip the switch and the vboost is open. When I have the mixture screws at 2 and flip the switch to open the v boost it idles and sounds perfect. I feel that if I dont hear that rump rump sound its probably getting too much gas. I could be wrong about that ? Ill add one more thing, when I turn the mixture screws out and try to listen to the engine sound to get the screws close I cant really hear any different sound until I have the screw nearly all the way in. Ive even turned the idle way down to where it nearly shuts off to listen for a change in sound but I cant really tell a difference. My main question here is about the plugs but if anyone has any thoughts I'd like to ear them. I may turn the screws to 2 1/4 turns and ride it for a while and then check it again
I put new spark plugs in and rode down the road in 4 th gear about 5,000 rpm for a few miles pulled the clutch , flipped the kill switch and rolled to a stop. I was looking for the golden brown look after seeing the spark plug chart and they looked a little white or grey . I'm 200 ft above sea level and running the stock 152.5 main jet and stage 7 needle 3rd clip from the blunt end, Morley air box/kit , Marks exhaust and I was at 2 turns out on my screws which don't really feel too lean but feels very crisp and pulls very good. I just wonder if the plugs are too new to read accurately . Do I need to ride longer on these plugs to get a more accurate reading ? I then turned them all out a half a turn more and rode home because it was almost dark and the bike just don't run as crisp. Also the bike i have has the old 3 stage v boost switch where you can flip the switch and the vboost is open. When I have the mixture screws at 2 and flip the switch to open the v boost it idles and sounds perfect. I feel that if I dont hear that rump rump sound its probably getting too much gas. I could be wrong about that ? Ill add one more thing, when I turn the mixture screws out and try to listen to the engine sound to get the screws close I cant really hear any different sound until I have the screw nearly all the way in. Ive even turned the idle way down to where it nearly shuts off to listen for a change in sound but I cant really tell a difference. My main question here is about the plugs but if anyone has any thoughts I'd like to ear them. I may turn the screws to 2 1/4 turns and ride it for a while and then check it again
Last edited: