15 replies to this topic

[cooperte]

https://youtu.be/VBHTTRLC5cQ

 

Hello, does anyone know what might be wrong here? I have a 2000 TDM850. It ticks over ok when cold until it gets warm then it starts struggling and keeps misfiring a bit and keeps nearly stopping the engine. And the exhaust fumes are a bit smoky. It also sounds to have a slightly harsher edge to it than it used to when I rev it.

 

I haven't really used this bike much since I got it a few years back but I've decided to get it running again and want to use it and tidy it up again. It used to be a nice bike

[drewpy]

sounds like its running on 1 cylinder 

 

have you got heat off each exhaust manifold?

[Nog]

What colour are the exhaust fumes?

 

If they are black and then it could be you're running way too rich for some reason, which explains why it's fine cold but will only be a problem as it gets warm and then this happens.

 

Could be a few things though of course, have you checked the plugs?  Have a look and see if any are wet/black, which would also show this.

 

Fresh fuel, clean air filter, etc etc....

[Snowbird]

If it's been stood probably the carbs gummed up.

[Studley Ramrod]

You could try increasing the tickover screw, see if it'll tick over at 1400rpm when warmed up.

 

Could be the choke sticking or, as mentioned, gummed up carbs.

 

Have you tried giving it some choke when its about to stall ?

[cooperte]

https://youtu.be/rKtCe3C_B54

 

Wow, thanks for all the responses. I've posted things on forums sometimes in the past and gone back three days later and no-one's replied.

 

It's definitely running on two. Both the headers get just as hot just as quick as each other and it feels like the power's there. And the fuel is new, I put it in only a few weeks ago. But there's definitely an edge to the engine sound that never used to be there. It came on while I was out riding it once, a different tone that just started out of the blue and it made me pull over and stop the engine and check it over (for what that's worth!). I couldn't see anything, rode it home slowly, checked the oil, it was a little bit low but not much, topped it up, and it still had this metallic edge to it.

 

Then it ended up going in the shed and I didn't get it out again for 3 years. I've got other bikes and I kind of lost interest in them as well. Just life getting in the way etc.. I'm keen again now though. I've just got my blade on the road and I want to get this TDM on again. What I'm wondering though is - is the engine knackered. I'm crap with these things. I'm hoping it's just that it needs plugs, carbs fettling, or some other thing that I can do with some advice, but if it's a big engine out job I think it'll be beyond me.

 

Sorry about the boring videos, but if you have a look at this one I've put on just near the end you can hear a tinny sound to the engine, and you can also see all the black shite it throws out the exhausts.

 

I'll try and look at some of the other suggestions yous have said tomorrow also, like checking if the choke is sticking etc. Thanks again

[dandywarhol]

In the 1st video it is definitely cutting back to 1 cylinder. Running on 2 in the second. The HT leads will probably be original and prone to corrosion. I'd check them first and replace them - only a few quid from a motor factor. Use copper core leads and just gently screw them on

Edited by dandywarhol, 16 June 2020 - 06:41 pm.

[cooperte]

In the 1st video it is definitely cutting back to 1 cylinder. Running on 2 in the second. The HT leads will probably be original and prone to corrosion. I'd check them first and replace them - only a few quid from a motor factor. Use copper core leads and just gently screw them on

Thanks mate. I'll get some new leads and try that

[drewpy]

def stumbles in the 2nd vid too.

 

carbs need balancing. I still say its on 1 cyl in the first vid, but 2 cyl on the 2nd.

I'd give it a service you may find the rattle goes (I couldn't really hear it) are the valve gaps due?

[butcher650]

If it's been sat, I would change oil and plugs, drain out any old fuel, check the little filter in the fuel pipe to the carbs, and possibly do a carb clean, and then re-balance them. Mine had been sat nearly 3 years too, and I've just done all this stuff, and seems atm to be running very well.

[Bjørge]

It's definitely running on two. Both the headers get just as hot just as quick as each other and it feels like the power's there. And the fuel is new, I put it in only a few weeks ago. But there's definitely an edge to the engine sound that never used to be there. It came on while I was out riding it once, a different tone that just started out of the blue and it made me pull over and stop the engine and check it over (for what that's worth!). I couldn't see anything, rode it home slowly, checked the oil, it was a little bit low but not much, topped it up, and it still had this metallic edge to it.

 

May be a rattling cam chain ? I experienced this a few years ago, it went away after some time (probably chain adjuster picking up slack). Your engine doesn't sound that bad ?

[cooperte]

Thanks for your help everyone. Taking the tank off today and getting a list of the parts I need to give it a service, new fuel filter, plugs, leads, oil. I'm a bad motorbike owner to be honest, I'm guilty of expecting too much from an old bike without performing much maintenance! Trying to change that about myself. But from what yous have said, I've got a bit more confidence that the engine isn't mechanically fucked up. I'll come back to you when I've finished and let you know if it's running better. I don't know how to balance carbs, but I'll have a root around for a youtube video. It's something I have to learn. I've got 3 bikes and they're all carbed, so I need to get my skills up (and my motivation!).

 

Thanks again all 

[dapleb]

Plenty on ear to help with balance when too get to that stage. You will need carb balancer or home brew tool for that bit.

[TKH]

Lots of stuff on here :- https://www.tdm-yamaha.heliohost.org as well. Best to join his site and then you can download anything.

[cooperte]

I haven't even tried, it's still just sat there. Not interested in it. I've got 3 bikes and I just use my Fireblade on the odd occasion I go out for a run. Does anyone want to buy it?

[dapleb]

Put it in for sale section and find oooot.