ignition timing - Honda Rebel Forum
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post #1 of 16 Old 10-13-2010, 04:07 PM Thread Starter
 
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ignition timing

hi, im wondering if there is a way to adjust the ignition timing on an 86 250 rebel? have some sputtering issues and have cleaned the carb and i just want to verify that there is no issue with the ignition timing if it is indeed adjustable. thanks
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post #2 of 16 Old 10-13-2010, 04:41 PM
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Sorry, but the timing is not adjustable. There is a procedure for testing iy but its all controlled by the CDI.
The sputter may be another issue, possibly a dirty air filter or fouled plugs.




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post #3 of 16 Old 10-14-2010, 10:42 AM Thread Starter
 
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Sorry, but the timing is not adjustable. There is a procedure for testing iy but its all controlled by the CDI.
The sputter may be another issue, possibly a dirty air filter or fouled plugs.
thanks, there are fresh plugs in it but i will double check the gap. do you know the recommended gap? also under load there is a backfire every so often and the plugs show a rich condition. also at times it can be difficult to start.
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post #4 of 16 Old 10-14-2010, 11:02 AM
 
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Gap should be 0.5-0.6mm right?

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post #5 of 16 Old 10-14-2010, 11:17 AM
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My manual shows 0.6 to 0.7 mm or .024 to .028 of an inch.

The rich condition could suggest a dirty air filter, improperly set mixture adjustment or excessive use of the choke.




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post #6 of 16 Old 10-14-2010, 09:51 PM
 
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Originally Posted by Buickguy View Post
Sorry, but the timing is not adjustable. There is a procedure for testing iy but its all controlled by the CDI.
The sputter may be another issue, possibly a dirty air filter or fouled plugs.
Sounds like the carb isn't clean enough yet. Sometimes you just have to have it Sonic cleaned.

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post #7 of 16 Old 10-15-2010, 01:21 AM Thread Starter
 
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yeah its odd bc it was running fine and sat for about 2 weeks then it developed this issue. ill pull the plugs and double check the gap and then i guess its on to taking the carb apart. any suggestions on what to check in particular on the carb that would be causing this issue? it an intermittent bog and sporadic backfire when revved.
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post #8 of 16 Old 10-15-2010, 08:37 AM
 
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how many miles or on the bike? I'v run in to a couple bikes were it seemed to be a carb problum. check the cam shaft lobes and make sure that the intake lobes are not wore out they will look like the ex. lobes and be the same length as the ex. lobs. I dont know it this is the prob but it wouldent hurt to check

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post #9 of 16 Old 10-15-2010, 04:27 PM Thread Starter
 
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how many miles or on the bike? I'v run in to a couple bikes were it seemed to be a carb problum. check the cam shaft lobes and make sure that the intake lobes are not wore out they will look like the ex. lobes and be the same length as the ex. lobs. I dont know it this is the prob but it wouldent hurt to check
thanks ill check that and also do an valve adjusment
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post #10 of 16 Old 10-16-2010, 11:10 AM
 
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drain tank and put fresh fuel in bike// set plugs at .030/ add a little seafoam in gas and run it a few miles/ install only ngk. plugs/ /see what happens/ its possible u may have dirt in carb/ or bad coil/
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