A forum for owners of Yamaha TTR250 trail and enduro bikes!

JOHNYBOY wrote:

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cant veiw scotts made plug also cant arrow back a page

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 There was a broken link on the page which I have now updated 

Everything working fine at this end, back button, etc., so maybe your browser needs a fix as Pete suggests?

Hello all, this is my first real post besides my introduction. 

This is on a 2002 blue 250

I was putting my oil filter cover back on after an oil change and the bottom bolt kept spinning. I removed the bolt and found metal shavings on the threads. I cleaned it and tried it again, but no go, it won't tighten. I talked to a local Yamaha guru and he said he has seen this in WR's and YZ's. I'm going to let him take it, he said he'll try and clean up the threads. 

Is this a common problem? Did I maybe over tighten it last time I changed the oil?

While he's in there, should I replace anything or have him check anything else?

On another oily note, I'm pretty sure my decompressor plug is leaking, and I saw that nifty replacement plug that is made for totallyttr. Are they imported to the US, or do I need to order abroad? I will probably order a stock plug until I can find more parts that I might want from totallyttr.  

Thanks, Jim

Yep a common problem

Hopefully your bolts will be fine and you can re use them, seem to have a few requests for them lately.

As Simon advised get the threads heli coiled and you should be good to go and be careful following Simons advice on the decompressor bolts too, as they can be striped easily.

We are the only people to manufacture the aluminium plug, happy to post

Good luck with the work and keep us all updated.

Steve

Sorry that there are already many topics about this leak, but I just wanted to ask a question about a possible easy fix to it

Like others have had, theres oil coming from the plug here 

Im thinking about buying the aluminium plug from totallyttrs and that will solve it, but im quite broke at the moment and was wondering if anyone has any thoughts about cleaning around it as much as possible and get rid of all oil around the area, and then use some JB-Weld that i already have and literally just put that around the whole plug, or just the edges of the plug where oil is seeping from. The only issue thats stopping me from just trying this, is that if it fails to work and oil still comes out, then it will be pretty impossible to then get the plug out and put a replacement aluminium one in.

Any thoughts appreciated

Cheers

The old rubber plug on my 325 cylinder head finally gave up the ghost and started to leak. The giveaway was a new oil mark on the stand and a smell of burning oil on a run.

I think I am on a roll today as it look literally 5 minutes to fit one of Steve's new aluminium plugs 

Tools needed:- hammer, centre punch and 10mm socket for the bolt.

It is important not to scratch or otherwise damage the housing else the new plug won't seal. Mine came out cleanly after punching a hole in its centre and gently levering it from different directions.

New plug looking good!

It would be a good idea to remove the plug and inspect the O ring, before it gets to messy. That's a couple that have leaked now, will look into the O rings. Is the surface it sits in perfect with no damage? These can easily be scored when removing the old rubber plug.

the arrowed bolt on the removed head isn't the decompressor plug, it's the bolt that engages on a groove in it to hold it in.  If overtightened it's threads strip easily.  I took that and the plug out, degreased thoroughly (cam cover needs to be off -  good opportunity to do the valve clearances!) and filled the whole lot with chemical metal, refitted the bolt for good measure so it wouldn't look as if something was missing.  No further problems.

Dan

If you have got through 2 rubber O rings and an original plug, defo must be something wrong with the housing, so think you are on the right track to have a permanent fix for your problem, what about gluing my special one or the stock one back in with stuff like this?  https://www.ebay.co.uk/itm/Pro-Seal-Red-Hi-Temp-RTV-Silicone-Instant-Gasket-Sealant-Dressing-Glue-85g/123126491490?epid=20012068343&hash=item1caae92962&_trkparms=ispr%3D1&enc=AQAEAAADAKvsXIZtBqdkfsZsMtzFbFsbX3WcW5fmB%2Fx7ZbaZTyexpOcI4%2BlfSHd577of1EqGJ5qm6I34rjvI4mBhxNtUcyqOmnNmEgY0aHqeV8D%2B3yQkbU48PykP7voWWPTdVFR0tV2MFPBuzhHowW72ojg2z5qs5TQsPqE1aSdyzQwR9JVO8sNSf04sD2dIGdYia1rzEHFzfsK9x3xwbUj18zw%2FsfULJl6GQYz3zoIhhUa5%2Bo9lxSRzg%2FsSuRtrTIA3f42s0BdQ18TQeJVD89MockHLcchSLsBxezGaseI9gTjStJ0pF9PrJsqfjh4x2%2FekSXrCkzf4gsuaSHgEpT83q1mbPF%2B445ro6Dk%2Fhd%2BKNKZZZmD2p1hqJAsKHv7KZNqCCLHwv9BpxYXQ7AZMKYjLGYAhNIdJd4FimOWbo6UgDnpc4K7ymq72hUE7Q8pvpzjAKgkdl4eJSJJD3PlSP96VkwuyqMIBnnW4GsEsIws%2F6VewS3sgAxabMeZyaa7bARNjczaXdZ9t9ae4KW9v7ctogNdzMDJAPMcAO1Oe9%2F4vEq4jwFCEd%2FY5NFGxu5vligFlYZr0llajuEZDigoMEb4DQrzXgija11upBtZDJq5TVzTpamq6a5p66feGV1jQH4lvHjjMVPFfk8Q1pPlpTJW%2BgrGYl3%2FdwqestFbekMXN%2BtQCgP5Vk%2BP1nxuHN%2FndicV06gnTN8AxF5SIqLf7zHWDxSxpv2jGvTWA5EaQHdvaGcekeD7iJzpJo7UyaYZQ%2B690%2FoX%2Fr5JGrP9PPoxIUFLanzbcf%2FWFlac1sSzvrUvqX58qSHyL5niCr6SjL%2B66zERWA3E4c1NRhiRWqp3XpKFSXg0SojwblEFLb4XoIx93jAIZS9eqAniucCkUJInGk%2FluHNylvHIecG1UdawRr%2BapZGCgTu2DNynpTF8MqMrU7QlkHl0Due9xZdrMd0T1biXcUOt5i2aep9ZUUKDJZX8uDHZFy03QPpRQzOlEJaV8MLzeoQT0%2F7sfw%2BK6qsoE1FrSXjBiFQ%3D%3D&checksum=123126491490ff0c8f23f7d84d2fbc3bffc8b0a34a6a

Wow that link looks massssssive!

Hi

The bolt that holds the plug in was leaking oil. I unscrewed it to check washer and the threads came with it !  Now the bolt won’t tighten

up.  I’m wondering if it was re-tapped before as the bolt was non standard. It’s this one. Any ideas for blocking the hole. Don’t think I have the knowledge to re thread it.

Unless you resort to a creative repair, the hole ideally should be drilled, tapped and a Helicoil (or similar) fitted so that the original bolt and copper can be fitted and be oil tight.

Step this way for creative repairs 

Brian

I have been cleaning up a cylinder head that still has the decompressor operating arm and rod in so I took a couple of photos to show it works. Pull the handlebar lever, the cable rotates the external lever which depresses the exhaust valve - simples 

There is no O ring on the original plug, it is metal with a rubber coating on the outside.

Hope that helps you.