Due to a long running manifold gasket leak, that I am now fixing, I've messed with the idle mixture screw more than I should have, finally stripping threads in the casting. So, I'm looking for suggestions on how to repair it.
The carb is a non-US Fuji carb from City Racer that I bought a couple years ago and it's worked very well, so I'd like to continue using it.
About the stripped threads, using a helicoil seemed logical, but due to the size and fine thread pitch, I couldn't find anything in a search to do the job. Without measuring, it seems like it might be a M5x0.5mm? A proper machine shop may be able to install an insert and re-tap, but nobody local comes to mind.
Using JB Weld to form new threads in place with the idle mixture screw inserted seemed like it might work initially, but probably wouldn't hold up for long.
Fyi, I tried wrapping the idle mixture screw with Teflon tape, which sort of worked without the spring, but I wouldn't trust it to hold. I lost my original idle mixture screw when it popped out on the highway. Took me a while to figure out why it was hard to start and wouldn't idle. Not fun on a main highway over 4th of July weekend. Don't want to risk that again!
My third option is to salvage the butterfly section from a cheap aftermarket carb I have for parts. It appears compatible, but I kinda wanted to preserve the complete Fuji setup, because it's worked well for me.
Any suggestions before I do the butterfly swap?
The carb is a non-US Fuji carb from City Racer that I bought a couple years ago and it's worked very well, so I'd like to continue using it.
About the stripped threads, using a helicoil seemed logical, but due to the size and fine thread pitch, I couldn't find anything in a search to do the job. Without measuring, it seems like it might be a M5x0.5mm? A proper machine shop may be able to install an insert and re-tap, but nobody local comes to mind.
Using JB Weld to form new threads in place with the idle mixture screw inserted seemed like it might work initially, but probably wouldn't hold up for long.
Fyi, I tried wrapping the idle mixture screw with Teflon tape, which sort of worked without the spring, but I wouldn't trust it to hold. I lost my original idle mixture screw when it popped out on the highway. Took me a while to figure out why it was hard to start and wouldn't idle. Not fun on a main highway over 4th of July weekend. Don't want to risk that again!
My third option is to salvage the butterfly section from a cheap aftermarket carb I have for parts. It appears compatible, but I kinda wanted to preserve the complete Fuji setup, because it's worked well for me.
Any suggestions before I do the butterfly swap?
