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Old 01-20-2011, 09:38 AM   #2086
kmax
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Location: Singapore
Oddometer: 222
welcome.. the exhaust seems aftermarket..

and nice ride you have there
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Old 01-22-2011, 06:34 PM   #2087
richard.bessey
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Location: Walla Walla, WA
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TDM missing on one cylinder

My 1992 850 TDM is only firing on one cylinder, I have:
  1. Replaced both spark plugs, the old ones looked fine
  2. Pulled the left plug cap, it would not start
  3. Pulled the right plug cap, it would not start
  4. measured the exaust pipe temperatures, they were about the same
  5. regapped the plugs
When I purchased the bike, I picked it up from the shop and the mechanic told me "It wasn't running right so we put new plugs in it"
They also cleaned the jets and balanced the carbs along with a new battery. The bike sat for about a year.
I had the bike running great 30 days ago, I started it and let it idle for about 10 minutes (I do this to all of my bikes during the winter, just to keep the fluids moving)
Today, I started it and it will only fire on one cylinder.
Typically, it always starts rough, and I let it idle for a couple of minutes to warm up, and then it runs great.

Thoughts?
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1994 XT 350 - The dirt machine
1992 TDM 850 - The street ride
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Old 01-22-2011, 06:45 PM   #2088
motorcyclefanatic
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Location: Christmas, FL; Blue Ridge, Ga
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Quote:
Originally Posted by richard.bessey View Post

Thoughts?
My guess would be clogged pilots. Doesn't take long with the gas these days.
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Old 01-22-2011, 08:05 PM   #2089
itsatdm
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How long did you let it run on 1 cylinder? IMO they have marginal vacuum fuel pumps. So if the carbs have a leaky float valve, the gas will leak out of the bowl and it seems like forever to get the fuel pump to fill it. On my bike it was always the right carb that seemed to leak. Usually a day or two was no issue, but a week would result it what you have or not start at all.

The cure for a lot of us was to get an early 90's Yamaha F6 or F1 electric pump for a carbed bike and toss the stocker. You will need a relay to wire it up. I never had the issue again.
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Old 01-22-2011, 08:49 PM   #2090
Backonthebike
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Location: Adelaide, South Australia
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Quote:
Originally Posted by kmax View Post
welcome.. the exhaust seems aftermarket..

and nice ride you have there
Yes, they are made by Staintune, an Australia company. Cost AUD $1,200 new. Glad the previous owner put them on. Make a great sound.
I put a K & N filter on it today, and blocked off the Euro emission control; seems to be an improvement.
Did a couple of hundred brisk cruising km's on it this morning through the Adelaide hills; fan-bloody-tastic!
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Old 01-22-2011, 09:05 PM   #2091
richard.bessey
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Location: Walla Walla, WA
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Update

UPDATE

OK, I took your advice and dug in, pulled the cowling, tank, air box, battery, and was able to take the carb bowls off. They look pristine! I took one totally apart to make certain and it was super clean.

I also took the fuel pump apart, I have had a lot of history with diaphragms cracking and causing numerous problems, so I took it apart. The diaphragms look good, though it looks like the pump has never been taken apart.

I put the air box and tank back on and fired it up, it runs but still pretty rough.

Do these diaphragms stiffen up over time?
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1994 XT 350 - The dirt machine
1992 TDM 850 - The street ride
1988 TW 200 - Wifes Ride
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Old 01-23-2011, 11:52 AM   #2092
itsatdm
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I don't think so, at least mine looked fine when having the symptoms I described above. If you got it running on both cylinders and it is still running ragged, it is probably not a fuel pump issue. I did have problems at times when running highway speeds from not getting enough gas. But it felt just like you ran out of gas. Bucked snorted and stopped.

There is another option to test the fuel pump (besides measuring output) and that is pressuring the tank. I carried a short hose, stuck one end in the tank after wrapping a glove around it and blew into it. That forced gas into the float bowls. Not highly scientific but it worked.

If you can get it running and it does not clear up, It still could be a carb problem. Cleaning the carb properly involves taking it apart, soaking in carb cleaner and blowing out the holes with compressed air. After that I would be looking for something electrical, like a bad coil. The other possibility is valve problems, are the clearances OK, do you have a burnt valve?
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Old 01-23-2011, 02:25 PM   #2093
richard.bessey
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Put it back together

So, I put the bike back together after sleeping on it. At first, it ran terrible. Had to keep the choke on to keep it running. After a couple of miles, it started running better (I assume the carbs finally filled up with gas)

So, its running better and does run on both cylinders, when I give it some gas. At idle, its only running on one cylinder and eventually dies.
Also, after getting off the throttle when coming to a stop sign, I get a single back fire out the pipes.
When I get on the throttle, both cylinders are running and the power is there

I am begginning to rule out the fuel pump ...

I personally have never checked the valves, and I do not know when/if they were ever done. I don't think I have a sticky valve, but I suppose it is possible.
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1994 XT 350 - The dirt machine
1992 TDM 850 - The street ride
1988 TW 200 - Wifes Ride
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Old 01-23-2011, 04:29 PM   #2094
itsatdm
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Manual calls for valve checks every 26,000 miles and clearances do tighten as they wear. A pia but worth the effort. These bikes have 5 valve heads. It only takes 1 exhaust valve to hang open a little to give symptoms like yours.
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Old 01-25-2011, 01:20 PM   #2095
skunky56
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Richard, it sounds like you do have one clogged pilot jet. Pull the float bowls and clean the slow jets, it should idle fine after you do so.
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Old 01-25-2011, 11:28 PM   #2096
AL-58
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When I had my '91, the valves were a problem. Clearances were meant to be checked every 42,000km but the bike would never make it that far without the inlets closing up making the bike run poorly. I put new inlet valves in at around 65,000kms.

A compression test would show if there was a valve problem.
Al
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Old 01-30-2011, 08:50 AM   #2097
kmax
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Location: Singapore
Oddometer: 222
one of TDM 900 03~04 model, caught fire on rear brake caliper.

rider said moving off was ok.. but on expressway, he felf bike was dragging.. but continue to ride on... until another rider flag him down..

only then, he found out rear brake was jammed and calipers were on fire.

now he needs to replace brake pump, caliper and brake disc.

workshop is not able to pin point the root cause..

for me, i usually spray WD40 to all joints and moving parts (especially after offroad rides)
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Old 01-30-2011, 09:09 AM   #2098
lonleywolf
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Hi there,
Just figured it out how to post pictures,thanks to Jeffrey hamlins video,http://www.advrider.com/forums/showthread.php?t=636380
There is my tdm 850,year 2001,took her out for some fresh air,not much rideing going on,-10 C at the moment.More pics to follow
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Old 01-30-2011, 10:23 AM   #2099
alexk243
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Location: Chicago, Illinois
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I know this has probably been mentioned before, but I am having trouble finding it, Does anyone know where to get racks to mount pelican cases to the back of a 92 TDM?

Cant seem to find them anywhere.
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Old 01-30-2011, 07:40 PM   #2100
richard.bessey
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Location: Walla Walla, WA
Oddometer: 512
Inductive timing light

So, I hooked up an inductive timing light to the left cylinder, fired it up, and its showing consistant spark.

So I shut the bike down, and changed it to the right cylinder, and I am getting almost no spark.

Anyone ever had a coil go bad on these???
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1994 XT 350 - The dirt machine
1992 TDM 850 - The street ride
1988 TW 200 - Wifes Ride
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