Question about Yamaha Serow 225 WE Motorcycles

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1991 yamaha serow backfires through carb and exhaust pipe glows red

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  • Yamaha Master
  • 41,695 Answers

Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage check for spark leakage in the dark.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.raptorforum.com/forums/66-raptor-660-maintenance/71417-just-cleaned-carb-now-exhaust-getting-red-hot-after-idling-only-2min.html
back fire and glowing red exhaust
Xt225 service manual free download
OEM parts for Yamaha
Yamaha XT225R Owner Manual

Posted on Feb 04, 2017

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Posted on Jan 02, 2017

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cape cod bob
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SOURCE: exhaust glows red

sounds like it's running too lean, could be **** in the carb starving it of fuel. remove air cleaner and spray a bunch of carb cleaner in and let it sit overnight, or take carb off and strip it and clean

Posted on Apr 08, 2009

  • 1 Answer

SOURCE: YAMAHA TTR 250 cherry red exhaust

I have a TTR-250 2005 that I bought new. Exhaust has slowly been getting hotter/redder over the last couple years. It quit running and idling smoothly just recently. I used some "Sea Foam" gasoline additive and it helped a little. After talking to guys at the Yamaha shop, the problem is most likely too lean a mixture due to deposits on the needle valve or build up in the carb somewhere. The sea foam did help but I'll be taking my carb apart soon to fix it totally (I hope).

Posted on Nov 10, 2009

sisadsl
  • 1508 Answers

SOURCE: what would cause a 2003 yamaha raptor 350 to

Either way too lean, or air intake leak, or the cam timing is out.
Does it help with the choke on?

Not certain of the timing on that model, but at top dead centre there should be some marks on the cam sprockets that will line up with the rocker gasket surface. The previous owner may have changed the timing by a tooth or two to try for more performance .

Posted on May 07, 2010

SOURCE: yamaha xt225 serow front exhaust pipe glows red within 5mins of starting also running rough

i had same problem on my serow 225,glowing red pipe no power and running rough rebuilt carb richend mixture tried alsorts ending up reset valves/tappets slightly bigger than spec and hey presto running cooler ,no glowing exhaust and plenty of power. it seems the bike started ok but as it warmed up and things expanded the valves were not shutting properly even though they were set right acording to manual. hope this is of some help to someone cos it seems alot of people get the same problem as i had thanks Eddie T Accrington England

Posted on May 25, 2012

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1 Answer

I have a 2001 yamaha yz426f that backfires after start and shoots flame from exaust and the exaust gets so hot it glows red.


Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.raptorforum.com/forums/66-raptor-660-maintenance/71417-just-cleaned-carb-now-exhaust-getting-red-hot-after-idling-only-2min.html
YZ 426 RED hot header pipe backfiring YZ 400 426 450
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
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Feb 08, 2014 | 2001 Yamaha YZ 426 F

1 Answer

Yz250f exhaust pipe glowing red straight away


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
250F 2005 yzf 250 exhaust glowing red
Help Header glowing orange WR YZ 250F
Yamaha YZ250F 2008 Owner Service Manual OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Aug 19, 2013 | Yamaha YZ 250 F Motorcycles

2 Answers

Yamaha xt225 serow front exhaust pipe glows red within 5mins of starting also running rough


Fueling issue running far to lean, choke makes the circuit richer so it will run , lean running causes over heating and serious engine damage if its running red hot, check the plug for white burnt or blistering will show lean running. Compression test to make sure the piston ring and barrel are not damaged over 110psi. Is the exhaust blocked restricted or dented ?

Mar 31, 2012 | Yamaha Motorcycles

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

03 beartraker engine pipe getting cherry red and backfiring it also is only running only at full or partial choke


You need to disassemble and clean your carburetor. Make sure the jets and carb body passageways are clean and clear. Unburned fuel from running the cycle on choke is burning in your exhaust pipe.

Oct 29, 2010 | 2002 Yamaha TT-R 250

1 Answer

2006 TTR250. Bike will not idle unless choke is fully engaged. After a minute or less of this the head pipe (the one that comes right off the block, I don't know if I have the name right) becomes glowing...


two things you have to oberved. Choke is only applicable if you experience hard starting in the morning,If yes then use choke for a while till you got your motor idling stage.the glowing red hot indicates that your engine is flaming hot, this means your choke is steadily on.( never stay your choke steadily on.).Try to clean your carb , carb cleaner will do. even without dismantling your carb from the engine manifold.Rev your throttle and spray through the air intake, you'll notice a foul sound bcoz the cleaner is mixing with your gas,it's fine.also you'll notice a black smoke while doing a full rev. it's also fine , thats the carbon that need to push out from your carb. take it from there my friend ...let me know the result.observed your bike

May 26, 2010 | 2002 Yamaha TT-R 250

1 Answer

Idles with choke on - dies immediately with choke off


check air bleeds in carb next check exhaust port and pipe may be clogged as well as air intake

Jul 21, 2009 | 2002 Yamaha TT-R 250

3 Answers

YAMAHA TTR 250 cherry red exhaust


Because the timing is off. If the timing is too advanced, or too retarded, it will make your exhaust pipe cherry red.

Jun 12, 2009 | 2002 Yamaha TT-R 250

1 Answer

Exhaust glows red


sounds like it's running too lean, could be **** in the carb starving it of fuel. remove air cleaner and spray a bunch of carb cleaner in and let it sit overnight, or take carb off and strip it and clean

Apr 08, 2009 | 2004 Yamaha YZ 450 F

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