81 GS850X from usa.
First the problem --is miss-fireing from 2-4k rpm when riding it above 4k its like a rocket , its like a peaking 2stroke engine. At idle the pilot screws don't make any difference above 3.5 turns which is were I have them to get the bike to start and run some carbs are at 4 turns . the sync of all 4 is good and the vac levels are high enough . I had 4 42.5 pilot jets so I replace the std. 40 jets and it runs a bit better . I can't find what the problem is as the engine ran perfect 6 months ago when the settings were 2.5 to 3 turns . I have checked everything , the valve clearances , compression is hi , no air leaks , the ignition is Dyna S which is very accurate and I have even checked that the spark is there for every pulse . but I remember a car I had had this exact problem and it was the coil .Though the color tune plug I can see the spark but there is no adjustment with the pilot screws.
any thoughts anyone ?
First the problem --is miss-fireing from 2-4k rpm when riding it above 4k its like a rocket , its like a peaking 2stroke engine. At idle the pilot screws don't make any difference above 3.5 turns which is were I have them to get the bike to start and run some carbs are at 4 turns . the sync of all 4 is good and the vac levels are high enough . I had 4 42.5 pilot jets so I replace the std. 40 jets and it runs a bit better . I can't find what the problem is as the engine ran perfect 6 months ago when the settings were 2.5 to 3 turns . I have checked everything , the valve clearances , compression is hi , no air leaks , the ignition is Dyna S which is very accurate and I have even checked that the spark is there for every pulse . but I remember a car I had had this exact problem and it was the coil .Though the color tune plug I can see the spark but there is no adjustment with the pilot screws.
any thoughts anyone ?
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