h1 running issue

[gsxrtriple1]

my h1b was running really sweet but now its popping /backfiring 
the timing is set at 25 degrees and was set up by local garage new plugs 
the carbs are 30 piliot 
100 mains 
needle clip 3
exhausts are factory pipes
it starts first kick pull away get to about 1 /4 throttle pos /backfires it then does this again at 3/4 im guessing its  afuel /air problem
because the timing was set only 500 miles ago i guess it should be still ok ?
just wondering on the timing side of things if there is a video of how to check timing on h1b points set up ?

[H2 Dude]

I find I have to re check the gap and the timing after 500 miles. then about every thousand.
I have had them firing at 3.1..3.4 and 2.8..
As they wear you can feel the drop in performance
Start by checking the point gap and as for timing you will want a dial gauge..DO NOT use the pointer.useless anyway/

[zambia]

Jul 22, 2014 23:30:50 GMT -5 H2 Dude said:

I find I have to re check the gap and the timing after 500 miles. then about every thousand.
I have had them firing at 3.1..3.4 and 2.8..
As they wear you can feel the drop in performance
Start by checking the point gap and as for timing you will want a dial gauge..DO NOT use the pointer.useless anyway/

+1 My S3 lets me know when the timing is out - it doesn't wheelie easily..if I ignore that for a while, it starts to pop and backfire.

[gsxrtriple1]

checked the points and the center set of points didnt have a gap or very little reset these and its back up and running   not to sure why the set of points would of lost the correct gap all the screws were tight for that set  ? but its one i will remeber if it happens again thanks fr advice