Question about Yamaha V Star 1100 Classic Motorcycles

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I have a 2009 1100 vstar and the engine spits occasionally back into the carburetor and some times pops so hard that it kills the engine. I took it back to the dealer they reset everthing and they say that it is a trait of the 1100 vstar

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Check your carb joiners aka intake manifold boots and o rings that mount in between. Cyl head and cyl head

Posted on Aug 05, 2012

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When Harley's spit through the carburetors they usually pull off the intake manifolds and reseal the them . New gaskets, o-rings, or even manifolds, whatever it takes to seal the intake. You may want to run some Yamaha Ring Free Fuel Additive ( Chevron Techron Fuel Additive) through the bike. A bad spark plug or spark plug cap could also be contributing to the pre-ignition that you are experiencing. If you can fix it yourself may be Yamaha will be kind enough to cover the parts cost if you are still under warranty and you are very polite in the letter you write.

Posted on Sep 05, 2010


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Two problems-dont know cause or if related or not. #1 engine backfires,stalls spits hesitate like not getting fuel

This is definitely a carburetor issue... when your rider needs more fuel and air to suffice the engine, it's not getting it. How old is the unit? When is the last time it's had the carburetor removed to he serviced...

Start there....

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Aug 03, 2012 | John Deere Garden

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My 1980 sportster back fires when started but after its running its OK.This just started what could cause this. Thanks JL

By the term "backfire",are you referring to the engine spitting back through the carburetor or popping through the exhaust system? You also didn't tell me what type of carburetor the bike is equipped with. A lot of the owners of early Sportsters didn't like the original carbs and replaced them with aftermarket carbs. Since the carburetors use different starting circuit designs, it makes a difference in how the engine is started. It really makes no difference and I've heard many bikes that do either or both of these things when starting. What does make a difference is how easily it startes and how it runs AFTER it starts. If it's simply a spit or a pop, this is not unusual. Does the bike run the way it's supposed to? If not, that's what we need to look at.

Good Luck

Sep 09, 2011 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

I have a 1980 sportster that back fires when I start it but after it runs it stops.Can you help me solve this. Thanks Jim

You didn't give me a lot of information. I'm assuming that by "back fires" you are talking about the engine spitting back out of the carb. This is the first place I'd start looking. If the bike has been allowed to sit up for an extended period of time, the gasoline would have evaporated in the float bowl. When it does this, it leaves behind the thick gummy additives that the refinery adds to the gasoline. This mess clogs up the jets and results in a very lean mixture which causes the engine to spit back through the carb and stall. I'd take the carb off the engine and completely disassemble it. Soak it in a professional grade carburetor cleaning fluid overnight and check every passageway and orifice to make sure it's clear. If you're uncomfortable in doing this, take it to a professional or at least someone with experience in dealing with the internals of the carburetor. A service manual will help if you still have the original carburetor on the engine. Also, the intake seals, called "rubber bands" on this model bike, may be leaking causing the lean mixture on one or both cylinders. While you have the carburetor off, this would be the ideal time to replace these as well.

Good Luck

Sep 08, 2011 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

Backfiring and popping on deceleration on a 2005 FLSTC, after installation of Vance & Hines longshot HS exhaust, & Big ****** air kit. The bike has sequential port f/i and was remapped with a...

Aftermarket pipes tend to lower back pressure, this will cause the fuel/air mix to lean out and result in the "popping" you hear---Backfiring, is extremely rare these days with electronic ignitions and the high reliability of engines. Real backfiring means the engine is not properly timed and the fuel/air mix is getting a spark and ignition at the wrong time (when the intake valve is open). Real backfiring is actually the bike "spitting up" in a sense, backwards through the carburetor or intake.You can check for exhaust leaks up around the cylinder heads by putting on some gloves and covering the exhaust tips momentarily. I have seen exhaust leaks that will make the popping worse by allowing air to be sucked in during deceleration...Hope this helps.

Jul 03, 2011 | Harley Davidson FLSTC - FLSTCI Heritage...

1 Answer

I have a 2003 heritage it started poping through the intake and has no power drain the gas and put new gas in and it still pops and has a hard time pulling its self only 8000 miles

I'm going to assume that this is a carburetor equipped machine. The spitting back out of the carb sounds like you're running lean for some reason. I'd check for a vacuum leak somewhere. If you don't find anything obvious, do a compression test on the engine and see what you get. There is a possibility of the cams being out of time but with only 8K miles, highly unlikely unless something has went terribly wrong.

If the bike is fuel injected, I don't have a clue what's wrong. I know nothing about Harley fuel injection.

Good luck

Apr 17, 2011 | 2003 Harley Davidson FXST Softail Standard

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