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9 Aug 2003
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Registered Users
HUBB regular
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Join Date: May 2003
Location: sydney australia
Posts: 20
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backfiring
bike ivj keeps backfiring after deaccelaration slowly getting worse apart from backfiring running fine could possibly be, ive made alteration to airbox closing original intakes and removing service panel after this alteration is it necessary to change jetting as seems to be sucking more air ,what are other causes of backfiring cheers
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10 Aug 2003
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Registered Users
New on the HUBB
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Join Date: Aug 2003
Location: Portsmouth, England
Posts: 11
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Backfiring is normally a sign of a weak mixture. Try blanking off a portion of the opening in the airbox and see if this makes any difference - although unlikely. It is however often caused by a loose exhaust pipe to Head joint or blowing gasket here. Another major cause can be a burnt exhaust valve.
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12 Aug 2003
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Contributing Member
Veteran HUBBer
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Join Date: Jul 2003
Location: Oxford, UK
Posts: 994
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Also try re-setting the mixture screw on the under side of the carb. I'm not familiar with XT's but you'll probably find it on the the cyl.head side of the carb. If so, it will probably be controlling fuel at tickover. Screw it in finger tight & no more and then screw it out approx. 1 to 1.5 turns. Try this on a hot engine. the backfiring should decrease. If not screw it out in eighth of a turn increments. If it still does not cure it by the time you're 3 or 4 full turns out, then it is a leaking exhaust or carb manifold.
If trying this, it is worthwhile taking the screw right out, watch out for the spring (sprung loaded on some bikes) & greasing it prior to screwing it back in finger tight (no more!!). Seized mixture screws are a pian in the arse.
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16 Aug 2003
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Registered Users
HUBB regular
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Join Date: May 2003
Location: sydney australia
Posts: 20
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cheers for the replys i havent had a play with the bike just yet but i think i know what the problem is the front racks i made for fuel cans dont allow the headers to fit snug so its out with the grinder once more
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Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...
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New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!
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Read more about Grant & Susan's story
Membership - help keep us going!
Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.
You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.
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