Hey guys did a post about hesitation and backfiring a couple of weeks back. Fully rebuilt the carb.Problem pretty much fixed. Still having a slight backfiring when on deceleration/coasting in gear. I have a baron jet kit 172.5 main 40 pilot pms 2 1/2 out needle clip 4th groove. Baron bak and v&h longshots. Any ideas would be appreciated. Thanks in advance
Slight backfiring
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is it backfiring from carb or exhaust? I see a lot of longshots with a yellow spot in the middle of the bike. If yours has that discoloration on the pipe the exhaust joint under that spot needs to be cleaned up and tightened. An exhaust leak can cause a decel pop. If it is an intake pop try another 1/4 turn out on the pms.👍 1Comment
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Exhaust side, already checked pipes from barrels to end of pipes no leaks. Something I just came across jet kit bak and longshots were in stalled when I purchased the bike many moons ago. While I rebuilt the carb pms was set 2 1/2 turns. I looked up the instructions on baron website and it said it should be set at 3 1/2 turns for that jetting. Seems that bike ran a tad rich but runs good for years. If you add a turn out doesn't that make run a bit more richComment
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Got it, so I wonder now why it has a 40 pilot jet and it's set at 21/2 turns. Maybe the the fat jet is making have that slight backfiring at deceleration/coasting in gear ??????Comment
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With baffles, it happens when your decelerating like coming up to light or another example is when your coming down a mountain road decelerating into a turn in gear or when your using the motor to slow you down. It almost like a blubbering popping sound. If that makes any sense. And when I said mountain road not at altitude.Comment
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Barons needle is only 5 grooves. You have a different brand needle if it is 6 groove. It's probably a Speedstar needle. If it is a Speedstar you would leave the clip in th 5th groove and step up to a 177.5 or 180 mainjet
It could also be a dynojet needle with 6 groove. I'll post a sheet with needle measurements to determine what needle you have.Comment
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They both have the same carb I was told mikuni bsr40. What year is your bike and what jets did you use and clip setting. Or did you go by instructionsComment
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After doing a little digging around I found that I may have mis-spoke about what needle you have. In the tech articles it claims that a barons needle does have 6 grooves.
I also found that there were at least 2 different kits made.1 kit was for 99-05 that the instructions called for clip in the 4th groove.
Then they come out with the BA2420RD 99-07 kit and the instructions say 4th groove for 04-07 and 5th groove for 99-03. I'm pretty sure that I have worked on carbs with 5 groove Barons needles. I wonder if the earlier kit was 5 groove and the later kit has 6 grooves.👍 1Comment
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