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24 Feb 2007
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Join Date: Feb 2007
Location: leighton buzzard beds uk
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r850r backfire problem help please.
Hi need some help please. I have a 95 r850r (25k miles). Owned it for 6 mnths and its been great so far, up until this week when it has suddenly developed terrible backfire under deceleration. Generally by the time it gets down to 2k revs the thing sounds like a shot gun going off. There seems to be a slight misfire/surge when you try to hold a steady throttle as well(I would not describe this as surging it seems to quick).I am worried it will blow the exhaust so am not riding it at the moment. I have changed the plugs, checked all the connections etc and as per advice on this site I have checked both cables are seated correctly. Air filter is good and I have read all the stuff on syncing the TB's and resetting the TPS. Anyone any ideas before I take the plunge and really mess things up?? Cheers. Strodius.(by the way this is an excellent site thanks for all those posting great info)
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24 Feb 2007
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Registered Users
HUBB regular
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Join Date: Oct 2002
Location: uk
Posts: 59
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backfire
check the exhaust for leaks, loose joints at the clamps are the usual cause of a backfire. run your hands over the exhaust before it gets too hot you should be able to feel any leaks. if not it could be carb balance or any number of other things
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25 Feb 2007
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Join Date: Feb 2007
Location: leighton buzzard beds uk
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backfire problem solved
Thankfully I have sorted this backfire fire problem. Turned out to be the RHS throttle body out of sync. Used a pair of borrowed vacuum gauges to find the balance was miles out. Tweeked the brass screws which made little effect and then adjusted the cable to recify. Reset brass screws to original settings and hey presto, back to normal running. Will have to buy myself a set of gauges to keep now.
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26 Feb 2007
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Contributing Member
Veteran HUBBer
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Join Date: Sep 2003
Location: Whangarei, NZ
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Since this occurred suddenly I'd check the cables carefully. Perhaps one is about to snap?
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27 Feb 2007
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Join Date: Dec 2006
Posts: 33
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Quote:
Originally Posted by strodius
Thankfully I have sorted this backfire fire problem. Turned out to be the RHS throttle body out of sync. Used a pair of borrowed vacuum gauges to find the balance was miles out. Tweeked the brass screws which made little effect and then adjusted the cable to recify. Reset brass screws to original settings and hey presto, back to normal running. Will have to buy myself a set of gauges to keep now.
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not gauges...vacuum gauges aren't sensitive/accurate enough.
...make a U tube manometer out of clear plastic hose for pennies (Home Depot, Lowes ect...) a manometer is dead on accurate and instantanious sensitive as it acts on pressure (negative) against pressure. I used red auto trans fluid as the liquid since it's similar to water and easy to see, but you could use any liquid...even water. light water is more sensitive than heavy mercury...the beauty of that is you can carry the compact coiled hose and add liquid on the road when you want to use. I would use 1/4+" ID hose with bushings for the connections...that allows some forgiving from bigger diameter...the danger is sucking the liquid thru if it's way way off to begin with.. the beauty of a manometer is you only have to compare easily seen liquid levels.
this quick easy solution is more accurate than both mercury or gauges.
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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...
2020 Edition of Chris Scott's Adventure Motorcycling Handbook.
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What others say about HU...
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"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA
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Lots more comments here!
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by Graham Field
Book, eBook, Audiobook
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Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!
New to Horizons Unlimited?
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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