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Thread: TW with 50k miles pictures of head removed advice please

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    Senior Member msmiller's Avatar
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    TW with 50k miles pictures of head removed advice please

    Bike down waiting on electrical parts. Removed head to clean hopefully to keep the oil cleaner longer. Discover the exhaust side can chain guide is so worn it's split. Is this tuff to replace? What else should I look at? Any advice is appreciated. Here are the pictures.
    Last edited by msmiller; 03-10-2017 at 03:59 PM. Reason: Spell check
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    Senior Member JerseyJeeper's Avatar
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    Quote Originally Posted by msmiller View Post
    Bike down waiting on electrical parts. Removed head to clean hooding to keep the oil cleaner longer. Discover the exhaust side can chain guide is so worn it's split. Is this tuff to replace? What else should I look at? Any advice is appreciated. Here are the pictures.
    Love to see the pics, not attached.
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  3. #3
    Senior Member msmiller's Avatar
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    Here they are. Could not get the regular forum upload to work on my phone had to log out and do it with mobile view


    After zooming in on the intake cam chain guide picture noticed it's part metal. I think someone pointed this out in the thread.
    So that's where the metal in my filter has been coming from. Mistaked it for clutch disc material.
    No mechanical engineer here but Yamaha has got some smart ones. This is the only bike I have riding. Got it out of a nesesity for cheap transportation and a the ability to get out into nature. 50k and all that's been done is normal ware stuff. On my fourth set of tires, third set sprockets and chain. Clutch disks. Learned how to do all of that on here. Thanks.... It's only 196cc, I weigh more then the bike. Well built and inexpensive. The world would be a better place if more people could/would ride a TW.
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    Last edited by msmiller; 03-10-2017 at 08:11 PM. Reason: Spell check

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  5. #4
    Ken
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    Congratulations on that mileage. I had to work on mine recently with 42000 miles. I poured oil into the exhaust port to see if my valve was leaking. I had done a base gasket change and didn't do this, once I put it back together then it decided not to start. It was running before and then I had to take it back apart due to a leaking valve. I disassembled the head except the valves. I took the head to a good machine shop along with the valve seals and they cleaned it up and did a valve job for $50.00 So my recommendation is check valves, go through carburetor no matter how good it was running. I didn't it had been running good but after it was reassembled the carb acted up as well. Change out the worn timing chain guide. I had to also. I only had wear on the intake side. Measure and inspect your cylinder for wear. Mine was still in spec so I passed on the piston and rings. My cylinder was much cleaner though. If your cylinder measures ok, soak a rag with Chemtool B12 and set on top of the piston and it will help loosen up that carbon. Put enough on the rag until nearly soaked but not dripping. Leave that overnight then clean in the morning.

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    Senior Member Mattwings's Avatar
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    Just my opinion, the chain guide has to be replaced. If it is running well, I would replace the chain guide and chain and button it back up. Cleaning it up could create problems.the parts get "bedded" together and disrupting that part to part relationship might not turn out well. I have not replaced a chain or guide on the TW, not sure on how hard it is to do. Removing the carbon build up might be ok, but freshening the valves or head would likely create added cylinder pressure that could cause oil loss or blow by, making your oil "dirty" even faster.
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    Senior Member Mattwings's Avatar
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    Just saw Ken's post, agree if the cylinder is in spec (size and compresion) the head work could make the bike run well for a long time! I like the Chemtool approach too!
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    2002 TW200
    1998 DR350
    1996 KDX 200
    Riding in and around the great state of Michigan (usually)

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    Ken
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    If it is on the left cam chain guide your in luck. These just pull straight up.
    On the right cam chain guide you will have to remove the left side cover by the shifter and the flywheel, (you will have to either order the $10.00 puller bolt from ebay or use your rear axle bolt. It still doesn't come off easy. I put oil on the puller bolt and tightened it, loosened it, about 5 times repeating until it popped off. If you just crank down on it sometimes it will just ruin the puller bolt. There are one or two small bolts holed the right tensioner in.
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    Senior Member AGman's Avatar
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    At 50000km, you are going to have to give this engine some love. if you don't, you wont get much more out of it. Check my latest post on my blog for what I do for a basic top-end freshen up, with the (in your case) addition of cam chain guides (both), and I would be removing the piston and taking it, with the cylinder to a shop to get measured. Get that same shop to clean the head up for you, carbon removal, check cam, rockers, rocker adjusters, valve grind.

    Did you notice any plastic in your oil filter or strainer? That's where the remains of the guides usually end up.

    At a guess, I'd say your cylinder/piston will be in spec. and you will just need rings, really depends on your oil change intervals and how hard it's been used.
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    Senior Member msmiller's Avatar
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    Its the intake chain guide ( right side) that worn. So I have to remove the rotor assembly. If I'm doing that might as well replace the chain and sprockets. Was looking in line to price the parts and it looks like the bottom timing chain sprocket is not a separate part? Parts diagram shows it's part of the crankshaft. The bike was running fine not as much power but it goes. Looks like it will be park for a month or two :0(



    Quote Originally Posted by Ken View Post
    Congratulations on that mileage. I had to work on mine recently with 42000 miles. I poured oil into the exhaust port to see if my valve was leaking. I had done a base gasket change and didn't do this, once I put it back together then it decided not to start. It was running before and then I had to take it back apart due to a leaking valve. I disassembled the head except the valves. I took the head to a good machine shop along with the valve seals and they cleaned it up and did a valve job for $50.00 So my recommendation is check valves, go through carburetor no matter how good it was running. I didn't it had been running good but after it was reassembled the carb acted up as well. Change out the worn timing chain guide. I had to also. I only had wear on the intake side. Measure and inspect your cylinder for wear. Mine was still in spec so I passed on the piston and rings. My cylinder was much cleaner though. If your cylinder measures ok, soak a rag with Chemtool B12 and set on top of the piston and it will help loosen up that carbon. Put enough on the rag until nearly soaked but not dripping. Leave that overnight then clean in the morning.
    littletommy and Ken like this.

  11. #10
    Senior Member msmiller's Avatar
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    Thanks AGman I do want to keep this bike running. I am learning a lot about it. It's treated me well so I'm gonna give some back. Oil changes are what has gotten me this far. It really has over 50k because the odometer was broken for six months or so. Going to try and find a machine shop locally.
    Quote Originally Posted by AGman View Post
    At 50000km, you are going to have to give this engine some love. if you don't, you wont get much more out of it. Check my latest post on my blog for what I do for a basic top-end freshen up, with the (in your case) addition of cam chain guides (both), and I would be removing the piston and taking it, with the cylinder to a shop to get measured. Get that same shop to clean the head up for you, carbon removal, check cam, rockers, rocker adjusters, valve grind.

    Did you notice any plastic in your oil filter or strainer? That's where the remains of the guides usually end up.

    At a guess, I'd say your cylinder/piston will be in spec. and you will just need rings, really depends on your oil change intervals and how hard it's been used.
    littletommy and Ken like this.

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