1998 hawk backfiring
07-27-2010, 10:31 AM
#1
Junior Member
Squid
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Join Date: Jul 2010
Posts: 4
1998 hawk backfiring
I just changed my oil and filter. Cleaned my stock air filter by blowing out debris with my compressor. And Swapped plugs. The plugs are an exact replacement. The engine is backfiring when I give it gas. I don't know why. Any thoughts?
07-27-2010, 12:27 PM
#2
Senior Member
Superstock
Join Date: Jul 2008
Posts: 320
Welcome to the forum. I don't see how the oil change or spark plugs would make a difference, so my money is on the gas tank or airbox. How did the old plugs look? Were you running rich or lean?
If this happened to me, I'd take the tank off and make sure I hooked all the hoses up correctly and none of them are kinked or pinched, and I'd also check to make sure the air filter is sitting correctly in the airbox.
If this happened to me, I'd take the tank off and make sure I hooked all the hoses up correctly and none of them are kinked or pinched, and I'd also check to make sure the air filter is sitting correctly in the airbox.
07-27-2010, 01:27 PM
#3
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MotoGP
Join Date: Mar 2007
Location: Phoenix, AZ
Posts: 3,132
PVLIR seems likely if it was your first time to remove the tank.
(petcock vacuum line doesn't go where it looks like it goes.. it actually goes on the back of the petcock pointing to the right, and not the bottom)
(petcock vacuum line doesn't go where it looks like it goes.. it actually goes on the back of the petcock pointing to the right, and not the bottom)
07-27-2010, 01:39 PM
#4
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07-27-2010, 03:28 PM
#5
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Squid
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All hoses are hooked up correctly. As I understand it, backfiring usually occurs from lean conditions. Is that right? Can the jet needle be moved to a different position? I removed the slide but it didn't look like the needle was adjustable.
07-27-2010, 03:41 PM
#6
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MotoGP
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To answer you question though, the stock needles are not adjustable unless to shim them. The fact that the bike didn't backfire before you pulled it apart points to something you did.
07-27-2010, 03:59 PM
#8
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Squid
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Join Date: Jul 2010
Posts: 4
The diaphragm is seated and sealed well. I lifted the tank to check all hoses for kinks. None that I can tell but it's not backfiring under acceleration now so maybe there was. But it still does it a little when I let off the gas. Is this normal being a V-Twin?
By the way, I'm new to the forum and have noticed a lot of military men are members. Thank you for your service. God bless you all.
By the way, I'm new to the forum and have noticed a lot of military men are members. Thank you for your service. God bless you all.
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