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Carb Troubleshooting & Adjustment Info
Unread 04-18-2005, 01:45 PM   #1
Galager
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Carb Troubleshooting & Adjustment Info

I started my bike up yesterday and as soon as I hit the starter, a loud pop like a gunshot went off. I can only assume this was a backfire. When I hit the starter again the bike started up like normal. It never did this before, is it normal or does it indicate a problem?
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Unread 04-18-2005, 02:46 PM   #2
dave101363
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First thing I would do is check your plugs and make sure that there good.
If they ain't the problem make sure your gas is good( that's probaly not it but you never know) if that don't work it sounds like the bike needs to be rejetted
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Unread 04-18-2005, 02:56 PM   #3
Galager
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Quote:
Originally Posted by dave101363
First thing I would do is check your plugs and make sure that there good.
If they ain't the problem make sure your gas is good( that's probaly not it but you never know) if that don't work it sounds like the bike needs to be rejetted

I'll take a look at the plugs tonight.. The bike is stock except for the holesaw mod so I would imagine that rejetting is unnecessary. I did adjust the air/fuel mixture screws. I think they are out 3 turn each if I remember correctly. Is that too much? I'm at sea level.
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Unread 04-18-2005, 02:57 PM   #4
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When I was riding down the road usually at higher speeds and quickly decelerated I would often backfire. Also, when I would do a medium acceleration thru several speeds, my bike would hesitate at certain RPM's. Talked to bike mechanic about it. They told me that Carbs jets needed cleaning, about $350.00 worth. I decided to buy new plugs though one might be fouled and ran premimum in bike for atleast 5 fillups. Both have helped fix my problems. Now she gets up and goes. Plus you can get more MPG with better gas. Bike repair shops said better gas would not clean the carbs. But IT WORKED................
Good luck.

Last edited by bigdavy_p : 05-03-2013 at 04:57 AM.
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Unread 04-18-2005, 05:14 PM   #5
AirportFF
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Read this concerning fuels http://www.shadowriders.net/forums/s...ghlight=octane

Now Galager, quick question. do you get gas in NJ? If your getting it there just over the GWB in Ft Lee....stop. I've had nothing but problems with any fuel I bought around there.

Try getting some B-12 Chemtool at Autozone. The stuff is awesome. Nav turned me on to it about a month ago for Susan's bike. Worked great!!! Just DO NOT get any on the paint.

Keep us posted and make sure to read the above link before going to a higher octane

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Unread 04-18-2005, 05:17 PM   #6
AirportFF
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Never mind the link I see you had posted to it......
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Unread 04-18-2005, 05:58 PM   #7
98 ShadowT
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Now I will also try some B-12 Chemtool and burn 87 Oct. for a while. See how she purrs again with that. Did not know that I was wasting gas with higher oct. Honda Owner Manual recomends 87 regular Oct.. in our bikes...
Does the B-12 really help to clean out the Carbs. Open the jets up.


Thanks.
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Unread 04-19-2005, 09:59 AM   #8
navillustoo
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Quote:
Originally Posted by 98 ShadowT
Now I will also try some B-12 Chemtool and burn 87 Oct. for a while. See how she purrs again with that. Did not know that I was wasting gas with higher oct. Honda Owner Manual recomends 87 regular Oct.. in our bikes...
Does the B-12 really help to clean out the Carbs. Open the jets up.


Thanks.

Yup! I like it better than Seafoam, it seems to be more potent. It should do the trick in a tank or two.

Brian
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Unread 04-19-2005, 10:16 AM   #9
navillustoo
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Quote:
Originally Posted by Galager
I started my bike up yesterday and as soon as I hit the starter, a loud pop like a gunshot went off. I can only assume this was a backfire. When I hit the starter again the bike started up like normal. It never did this before, is it normal or does it indicate a problem?

Galager,
My bike has done this on occasion as well, it's no big thing. What I believe causes it is some amount of unburned fuel is present inside the combustion chamber. When you first begin to crank the engine over, the exhaust valve is probably sitting open and the bang you hear is that fuel being ignited prematurely. There's nothing wrong with your plugs, they fired didn't they?


Brian
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Unread 04-19-2005, 10:24 AM   #10
navillustoo
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Quote:
Originally Posted by 98 ShadowT
When I was riding down the road usually at higher speeds and quickly decelerated I would often backfire.

ShadowT,
This is what is referred to as "popping on deceleration". It is caused by a too lean idle circuit. You can eliminate the popping by richening up your idle circuit. You'll have to drill out the plugs covering up the idle mixture screws, so you can adjust the screws. Use a 5/32 drill. I like to leave the plugs in place and adjust the screws with a small screwdriver through the hole. The plug will keep the screw from backing all the way out, but still allow adjustment.
If the popping has subsided, it was probably a fuel flow problem that cured itself by running fresh fuel through the carbs.

Brian
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