Transmission oil bolt thread - damaged thread neck

[Frosty_Power]

I recently purchased a 99 CR125 and was told by the previous owner that there is a very slow leak in the transmission oil bolt and mentioned he believed it was cross threaded. I removed the bolt yesterday and to my surprise, the steel neck where the bolt goes in was half missing. Looked like it cracked off. Not sure if I am explaining this in detail but if I tighten the bolt back up, I could see some threads on one side cause the thread neck is sheared off. I didn't know what else to do, so I took some thread tape and proceeded to put the bolt back on and fill up my oil. Ran the bike for 15 minutes and checked for leaks. No leaks yet and checked this morning and was dry. I was hoping to go out for a trail ride this weekend. Am I safe to do so? What are my options to get this fixed? I was thinking of bringing my bike to a machinist to fix. Any suggestions or feedback?

Thanks in advance and also, this is my very first post, been hanging around here for awhile getting great info. Great site!

 

[Patman]

Did the bolt have a washer on it? Typically aluminum or copper.

 

[Frosty_Power]

Did the bolt have a washer on it? Typically aluminum or copper.

Not sure, there was no washer when I pulled off the bolt.

 

[Frosty_Power]

Not sure a washer will really help in my position that I'm in. I'll try and take a pic tonight and post it. Thanks!

 

[TRexRacing]

I would refrain from using tape.Use the liquid type sealant and safety wire the bolt to assure it doesn't fall out while riding making a bad situation worse.You'll eventually need to disassemble and repair that.But keeping the oil in the trans will make the repair less expensive.

 

[Ol'89r]

A good tig welder/machinist should be able to reweld the broken piece, retap and surface the sealing washer area without taking the engine apart. Even if the piece is missing, it can be built up with aluminum rod and remachined.

Look for automotive/motorcycle machine shops in your area.

 

[Frosty_Power]

A good tig welder/machinist should be able to reweld the broken piece, retap and surface the sealing washer area without taking the engine apart. Even if the piece is missing, it can be built up with aluminum rod and remachined.

Look for automotive/motorcycle machine shops in your area.

good idea. i think i'll do that some time next week. i should be okay for an afternoon ride this weekend, do you think? i'll keep a close eye on it.

 

[Frosty_Power]

Thought I'd attach some pics incase this happens to anyone else in the future. Off to the machine shop for me!

 

[Frosty_Power]

Here you can see the threads on one side of it.

 

[Frosty_Power]

I'll post pics of the fixed product when I get it back.

 

[Someone]

Now it all makes sense to me. Damn that sux.