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i have a 81 jag 4000 it is poping bad and i think backfireing too... i changed the coil and black box.... what could it be?
can you adjust the timing on them or no??? any ideas??? new plugs too.....
 

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Make sure that you don't have plugged jets in your carburetors. If carbs look fine then it could be timing off. If I remeber correctly you can turn the stator plates on the 81 Jags. It could also be a partially sheared key in the flywheel.

The best way to check your timing is with a Strobotic (Xeon) Timing light. A standard timing light can not keep up with the speed of the 2 cycle ignition.

I would recomend tring to find a tech manual for this so you can be accurate with your timing specifications
 
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