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

One1 · Veteran Member

Carb broken

One1 · Veteran Member

Idk if this will work so i still would like to hear others ideas, but steelstick by jb weld swears they are able to cure in gas so I've tried it and we will see. The epoxy mix jb weld that was on there softened up quick with gas.

ttr steve · Super Guru

This is the best fix I have seen. Done by Ronridesbikes

Thumb screw repair to float post.jpg

Ron's explanation:

"It's a common thumb screw. I filed the winged sides from it. The drill and tap were $5 as a set.

Be careful with the tap. The aluminum casting is so soft it gums up the tap threads quickly. 1/2 turn in, 1/4 turn out and remove it to clear the treads every 2 turns. Go Slow.

I center punched the top of the post and pre-drilled with a smaller bit to be sure I stayed in the middle of the post. Make sure you drill straight down, Check it from two sides as you drill. Again, go slow. Don't drill too deep. Measure the post and put a piece of tape on the drill to set the depth.

Don't worry about tapping all the way down. Put tape on tape as well. Let the thumb screw cut the last few threads so it sets tight. But go slow. If you feel it binding, pull out and use the tap a little more.

You'll have to put the screw in once to mark where to drill the float hinge pin hole. Remove the thumb screw to drill the float hinge pin hole. Center punch that too. The drill likes to move around on the chrome finish.

File the thumb screw wings to within 1/16 of an inch all around the hole so the float bowl will clear and the float it self can pivot the full radius it normally would.

Note - depending on the length of the thumb screw, you may have to cut it down. Make sure you put a nut on it before you cut it so you can clean the threads up before you mount it in the carb. "

One1 · Veteran Member

Thank you, i bought steel stick and fixed it. Then i stuxk a test piece in gas to see if it goes soft. It has been rock solid for 12 hours so i think its good.

I'll do a few pics if it stays hard for a day or two. Gotta be sure.

TTRfan · Super Guru

Found JB SteelStik in the UK - see here

Let us know how you get on Brian!

One1 · Veteran Member

24 hours. Solid as a rock. I'm surprised and pleased.

One1 · Veteran Member

Well it's been a few days and it's a very solid the stuff cured like a rock and is more than strong enough to hold the float in. the biggest issue was whether or not it would soften up, but it doesn't it's as hard and as solid as the original post is ......so I can definitely recommend it, but make sure you clean everything with the dremel well because that's always the key to making something work is how well you prep it