« previous next »
Pages: 1 2 »   Go Down

Author Topic: backfiring?  (Read 2026 times)

Offline jim-d

  • Arena
  • Jr. Member
  • **
  • Posts: 59
  • Country: us
backfiring?
« on: August 18, 2020, 06:34:17 PM »
what would cause a 2002 c-10
to backfire thrrough the exhaust?  it is imtermittent and not when pulling out.  more gliding to a stop.  bike was running a little funky then started backfirig. but the engine smoothed out.

had the carbs rebuilt in August.  then the bike ran great.  sat for a month and started acting up.
Logged

Offline Boomer

  • Full Member
  • ***
  • Posts: 863
  • Country: gb
  • Wickford, UK
    • Boomers GTR Site
Re: backfiring?
« Reply #1 on: August 19, 2020, 03:19:23 AM »
If it is when you have the throttle shut, it's probably an exhaust leak.
Somewhere the exhaust is letting fresh air in and the un-burned or part-burned fuel is igniting in the exhaust.
So, either you are running very rich and still have the PAIR valves fitted, or you have a leak in your exhaust.
Check the balance pipe, where the headers bolt to the engine, and where the muffler attaches to the header.
Logged
George "Boomer" Garratt
Wickford, UK

Offline Chrome Megaphone

  • Full Member
  • ***
  • Posts: 166
  • Country: 00
Re: backfiring?
« Reply #2 on: August 19, 2020, 08:34:49 AM »
I thought popping on overrun was lean? 
http://www.mikuni.com/tg_backfires_in_exhaust.html
If no exhaust leaks maybe there's still junk in the carbs, Check the intake boots by spraying carb cleaner and listen for RPM changes.
Logged

Offline VirginiaJim

  • Administrator
  • Elite Member
  • *****
  • Posts: 11334
  • Country: england
  • I've forgotten more than I'll ever know...
    • Kawasaki 1400GTR
Re: backfiring?
« Reply #3 on: August 19, 2020, 10:31:41 AM »
Could also be sitting for a month and something got gummed up.  Something I don't experience anymore with FI.
Logged
"LOCTITE®"  The original thread locker...  #11  2020 Indian Roadmaster, ABS, Cruise control, heated grips and seats/w/AC 46 Monitoring with cutting edge technology U.N.I.T is Back! Member in good standing with the Knights of MEH.

Offline Chrome Megaphone

  • Full Member
  • ***
  • Posts: 166
  • Country: 00
Re: backfiring?
« Reply #4 on: August 19, 2020, 10:46:36 AM »
If you paid for the carb job take it back.  I would. If the tech didn't soak them long enough and chase the passages with a strand of throttle cable before blowing them out he didn't do it right.
Logged

Offline Chrome Megaphone

  • Full Member
  • ***
  • Posts: 166
  • Country: 00
Re: backfiring?
« Reply #5 on: August 19, 2020, 10:49:58 AM »
Quote
had the carbs rebuilt in August.
Last August?  Sat through the winter?
Logged

Offline DC Concours

  • Arena
  • Full Member
  • ***
  • Posts: 399
  • Country: us
  • 2001 Concours, ~35K miles
Re: backfiring?
« Reply #6 on: August 19, 2020, 11:00:27 AM »
I haven't had carbs cause backfiring issues after a long storage period. Just hiccups and low speed rpm issues. Redo the carbs after you eliminate any exhaust problems.
Logged

Offline Daytona_Mike

  • Arena
  • Full Member
  • ***
  • Posts: 825
  • Country: us
Re: backfiring?
« Reply #7 on: August 19, 2020, 03:47:57 PM »
One month??... I have had jets blocked from sitting 3 weeks. You may have to dump that fuel ..drain the bowls... and try fresh fuel. Are you adding  a capfull of two stroke oil to each tank of gas? Stabilizer?  Anything? Ethanol free fuel?

Logged
If you still have fuel in the tank, you are not lost yet
Most motorcycle problems are caused by the nut that connects the handlebars to the saddle

Offline jim-d

  • Arena
  • Jr. Member
  • **
  • Posts: 59
  • Country: us
Re: backfiring?
« Reply #8 on: August 20, 2020, 12:56:26 PM »
I'm done with this bike.  I believe it was severely damaged by leaking carbs.

When I got the carbs back it ran like a top, that was May.

last week I started it up, there was a decided thump, like one cylinder wasn't firing.  made a mental note

last night started it again & things got ugly.  Started backfiring, the thump went away but I stopped for gas & it wouldn't start and run without the enricher on full.  No power in the throttle.   There was a metallic ping when it ran.

So I am tired of this machine and an offering it to anybody who wants it for free.  I live in Marlton NJ, come get it.
If transportation is a problem I will gladly get the sawzall and chop it up into manageable parts for you.

Call me, come get it.

Logged

Offline Chrome Megaphone

  • Full Member
  • ***
  • Posts: 166
  • Country: 00
Re: backfiring?
« Reply #9 on: August 20, 2020, 01:44:57 PM »
Why are all these free bikes always in the NE? :(
Logged

Offline DC Concours

  • Arena
  • Full Member
  • ***
  • Posts: 399
  • Country: us
  • 2001 Concours, ~35K miles
Re: backfiring?
« Reply #10 on: August 20, 2020, 04:22:42 PM »
Who did your carbs? Were overflow installed? You may have a bent rod.

Don't throw away your bike. It still have lots of valuable parts on it.
Logged

gpineau

  • Guest
Re: backfiring?
« Reply #11 on: August 20, 2020, 04:41:11 PM »
If I lived in NJ I would take you up on it. Lots of good parts still on it. I'm in colorado so I cant.
Logged

Offline DC Concours

  • Arena
  • Full Member
  • ***
  • Posts: 399
  • Country: us
  • 2001 Concours, ~35K miles
Re: backfiring?
« Reply #12 on: August 20, 2020, 04:45:07 PM »
Me too. If I had a truck i would drive to him. Damn.
Logged

Offline jim-d

  • Arena
  • Jr. Member
  • **
  • Posts: 59
  • Country: us
Re: backfiring?
« Reply #13 on: August 20, 2020, 05:01:11 PM »
carbs were done by popular person on this board.  thought i was home free.  valve is on run and been leaking for 2 days. nowthe neighbor is complaining about the smell.  i have just had enough.
Logged

gpineau

  • Guest
Re: backfiring?
« Reply #14 on: August 20, 2020, 07:18:27 PM »
So do you think you hydro-locked and bent a rod ?

Bummer.
Logged

Offline Daytona_Mike

  • Arena
  • Full Member
  • ***
  • Posts: 825
  • Country: us
Re: backfiring?
« Reply #15 on: August 20, 2020, 08:10:34 PM »
Quote from: jim-d on August 20, 2020, 05:01:11 PM
carbs were done by popular person on this board.
  SO... do you know if  this popular person did  install OverFlow tubes??  I hope?
 
Logged
If you still have fuel in the tank, you are not lost yet
Most motorcycle problems are caused by the nut that connects the handlebars to the saddle

Offline Chrome Megaphone

  • Full Member
  • ***
  • Posts: 166
  • Country: 00
Re: backfiring?
« Reply #16 on: August 21, 2020, 10:29:23 AM »
Quote from: jim-d on August 20, 2020, 05:01:11 PM
carbs were done by popular person on this board. 
:popcorn: lol
Logged

Offline Chrome Megaphone

  • Full Member
  • ***
  • Posts: 166
  • Country: 00
Re: backfiring?
« Reply #17 on: August 21, 2020, 02:46:52 PM »
Maybe O/T but isn't it better to have hydrolock than a garage fire?
Logged

Offline DC Concours

  • Arena
  • Full Member
  • ***
  • Posts: 399
  • Country: us
  • 2001 Concours, ~35K miles
Re: backfiring?
« Reply #18 on: August 21, 2020, 10:37:39 PM »
Did Steve from Fla do your carbs and were overflow tubes installed?

Logged

Offline jim-d

  • Arena
  • Jr. Member
  • **
  • Posts: 59
  • Country: us
Re: backfiring?
« Reply #19 on: August 24, 2020, 07:48:27 AM »
yes I think I did. 

Putting htis thing on craig's list today.

LAST CHANCE!!!

Going shopping tonight on the list

Yamaha MT 07  2 cylinder 650
Kawasaki W 800 2 cylinder air cooled classic just like my college days
Yamaha Bolt.  Sportster like air cooled 650

Back to basics, no motor bloat for this guy.

I like the Honda CB650F but it's heavy & 4 cylinders.  I think I'm cured!

I want something 400lbs or less that is simple to take care of.



« Last Edit: August 24, 2020, 08:21:55 AM by jim-d »
Logged
Pages: 1 2 »   Go Up
« previous next »