Question about 2002 Yamaha TT-R 125

1 Answer

Hard to start at first then pipe gets red hot where it attaches to motor. also backfires when trying to start intermittantly

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Guru:

    An expert who has written 7 tips or uploaded 3 video tips

  • Expert
  • 267 Answers

Could be a host of things from poor valve tolerances, wrong jets in carburetor, wrong range sparkplug, type of fuel used or a loose stator assembly. Has the top end been maintained? Is compression good? Correct oil type and level? Using the muffler or not? Header dented? Is it serviced regularly?
Retarded timing will run the exhaust hotter than normal and backfire easily, will also ruin valves, piston, rings and cylinder bore.
Take generator cover off and check stator housing and pick-up coil are not loose or show signs of movement in any way.
Check condition of carby jets and replace with stock # or one size larger. Check inlet manifold for air leaks or cracks as too lean a motor will burn valves/piston crown. If this is not the cure, your problem should be left to a mechanic with 4 stroke experience.
http://www.yamahaownershandbook.com.au/index.php
Your bikes manual can be downloaded free at this site.
Cheers.

Posted on May 07, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Backfire mgb not starting?


Backfire when trying to start a motor is associated with rich running, (too much fuel or unburnt fuel), retarded timing, carbon arcs in the distributor cap, intermittent dirty points, spark plug wires out of order and jumped or skipped timing chains.

Apr 28, 2014 | Cars & Trucks

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
Yamaha YZ450F Owner Manual Page 3

Feb 08, 2014 | 2001 Yamaha YZ 426 F

1 Answer

2000 Jeep Grand Cherokee back fire


Backfiring is caused by unburned fuel igniting in the exhaust system, which could be the header, catalytic converter, muffler or exhaust pipe. Red hot is caused by the burning fuel. You either have a timing issue or you are not getting enough air flow into the fuel injection system, which can happen for several reasons. I would try to find a good local mechanic and pick their brain.

Dec 28, 2011 | 2000 Jeep Grand Cherokee

1 Answer

Pipe gets red hot and backfires


If its not the valves it could be lean. Is the hot start adjusted right? They mean it when they say check valves every 300 miles on these bikes. I just went through the same thing on one.

Sep 13, 2010 | 2005 Honda CRF 250 X

1 Answer

Wont stay idling and backfires


could be 2 different things,#1 could be the carb that needs cleaned and adjusted( i would try that first,easy.)....#2 valves need adjusted ( is the exhaust pipe getting red hot where it comes off engine?) the factory settings for the valve clearance is 0.04 for intake and exhaust both (with stock carb and head)

Jun 25, 2010 | 2005 Honda CRF 150 F

4 Answers

Backfire


is it a straight thru exhaust, or is it just a head pipe with nothing attached? If it's just a head pipe, you need to get some sort of muffler on it or you'll burn your valves out from a lean condition. The backfire is due to the vaccum fed carbs that yamaha runs. They work wonderfully, but under heavy deceleration, the vaccum still feeds the bowl, and it builds up excess fuel, which eventually burns off as a backfire. If it were fuel injected, you could have the fuel map adjusted to lean it out under deceleration.

Jun 22, 2010 | 2001 Yamaha V Star 1100 Classic

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

Backfire, cherry red caty converter, difficult start and idle


coloured pipes can that eng is running too hot, weak mixture,air leaks in ind and ex ,ignition timing retarded = advance/****** unit sticking or siezed.thin stainless pipes will normly discolour

May 13, 2010 | 2004 BMW R 1150 RT (ABS)

1 Answer

04 yz250f pipe at motor glowing red hot


Any reason you had to change the jetting??New pipe,Intakes.?But,even though you may have it a bit rich on idle the pipes WILL get very hot,very quickly without some sort of air flow over the front of the motor and radiator.At the very least,have a strong fan blowing directly on the front of the motor if you are going to let the bike run and you are not riding it.I have seen the white plastics in front of the radiator distort from the radiant heat.Don't idle them for in more then 20 seconds.It can do heaps of damage.Ride the bike and see if its running well.When you stop,turn it off.All the yz and wrf will get very hot at idle.Hope this helps

Jan 17, 2010 | 2004 Yamaha YZ 250 F

Not finding what you are looking for?
2002 Yamaha TT-R 125 Logo

163 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts

dhnguyen

Level 2 Expert

281 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1144 Answers

Tony

Level 3 Expert

2600 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...