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I have an 87 Yamaha Warrior just put a new Zoom Zoom carburetor and a fmf header pipe and muffler with aftermarket air cleaner it wants to stumble and run out of fuel at wide open throttle

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6ya6ya
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Posted on Jan 02, 2017

jpolicky
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SOURCE: honda 1300c backfire through carb at wide open

If you have used Dyno jet kit I have had a kit come through with smaller main jets than the stock ones causing it to run way to lean.

Posted on Jun 01, 2009

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I have an '06 Vstar 1100 classic and i bought new exhaust pipes for it. How do i get the stock muffler off the headers?


often the sealant used is the problem,undo and remove the bolt/s holding the muffler to the swing arm there will be a clamp of some sort to tighen the muffler to the header undo this and you may need to lightly prise the header pipe open ,normally there are slots in this pipe to allow it to compress onto the header or it could be other way round where slots are on the muffler pipe. you may need to lightly tap these pipes away from each other with a block of wood and a hammer. in some cases they will be very tight together. in the past i have had to run the bike to get the exhaust hot and then cool down with water ONE of the sections to shrink it. BE CAREFULL NOT TO BURN YOURSELF. they should seperate fairly easy then.

Sep 06, 2011 | 2001 Yamaha V Star 1100 Classic

2 Answers

I would like my vtx 1300 to be a little louder. can i drill a small hole in the back of the muffler to make it louder will this work any pros or cons please


Honda mufflers typically have several baffle walls You may need a drill 14 or more inches in length to punch through enough of these walls to make a noticeable difference. Changing the back pressure of the exhaust will also lean the mixture. This may cause a bad hesitation on take off. This will happen if you change the exhaust system also. To correct the hesitation you may need to install a jet kit on a carburetor model (about $100) or install a Power Commander on a fuel injected model (about $400 plus programming). In both cases your fuel economy will go down. Your stock system has a five year warranty, should not blue like an aftermarket pipe (unless you leave the choke on too long), and have a good long service life. Unfortunately there is no easy solution for your problem. Any aftermarket system will be way to loud (especially on the freeway) and drilling may not give you the desired sound you are looking for leaving you angry and frustrated. Consider a different option, One of the best sound options I have heard was a set of stock Harley pipes adapted to a Yamaha Virago 1100. Most Harley riders change out there exhaust systems before they even ride there bikes which should offer a cheap high quality system that can be adapted to your stock headers with common automotive adapter pipes and custom build it yourself supports (a simple modification of your stock pipe support/mounts). By not damaging your stock system you can always put it back on if you do not get the desired effect.

Apr 09, 2011 | 2004 Honda VTX 1300

1 Answer

2007 yamaha yz450f... while riding last week it was backfiring on deceleration. it blew a 5 inch hole in the header pipe. i purchased a new one, cleaned the air filter, changed the oil and put a new spark...


Exhaust leaks near the exhaust port can draw air into pipe on deceleration and detonate any unburnt fuel leaving engine, causing backfire and high temps.
An overly lean fuel mixture on the engine can make decel backfire worse too.

Mar 13, 2011 | Yamaha YZ 450 F Motorcycles

1 Answer

I am getting pre-ingition knock when I throttle fast and front exhaust pipe is turning blue. Also backfires when letting off throttle. Only 8,000 miles


Backfiring when slowing down is usually caused by leaking exhaust gaskets in the head, or head pipe to muffler connection. A lean condition on the front cylinder could be dirt in the carburetor. Although the bluing in the pipe could be caused by unburned fuel from a malfunctioning choke mechanism on the front carburetor or leaving the choke on too long. Often the the pinging is caused by ethanol in the fuel you are using. Your bike should be designed to run on 87 Octane regular unleaded style gas. If you have non-ethanol style fuel available in your area , I would run a tank of non-ethanol fuel with a dose of Chevron Techron fuel system cleaner in the tank. Inspect the choke mechanism is working correctly and replace your exhaust gaskets.

Nov 03, 2010 | 2004 Yamaha V Star Silverado

1 Answer

2000 Yamaha XJ 900 S Diversion bad muffler


Hi, A the answer to this question is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Boonstra Parts
Quality Replacement Parts For Yamaha
Yamaha 95 XJ900S Service Manual
OEM parts for Yamaha
Yamaha diversion 900 XJ900S Owner Manual

May 18, 2010 | 2000 Yamaha XJ 900 S Diversion

1 Answer

New slip-on FMF Powercore 4 on 02' TT-R250


i looked up in the book for jets for your bike,i diden't see any.you could try to drill out the jet but they are brass.and very fragile.unless you are a machinest.also did you upgrade your air filter to go along with your new exhaust?

Apr 13, 2009 | 2002 Yamaha TT-R 250

2 Answers

Crf 150f backfire


change the jetting...youcan contact FMF for thier setup recommendations for running that pipe with the bike...very common problem and jetting will take care of alot of the issue

Mar 31, 2009 | 2003 Honda CRF 150 F

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