Stripped bolt in head

[Angus67]

With all the screwing(err...bolting), i stripped the bolt for the intake manifold. So now i have to pull the engine to get a straight shot with a drill for a helicoil. Its a m8, correct?

[rjmorel]

Would make it a lot easier to work on it. Unless you can sneak a helicoil tap up in there and have room to turn it. Then install the helicoil. rj

[Angus67]

Yeah. Gonna move as much stuff out of the way to see if i can sneek tools up in there. Its the lower of the two bolts, so fingers crossed.

[Mudflap]

Can you just pull the head off and leave the engine in place?

[Megadan]

I know my head uses an M6x1.0 thread on the intake side. I would recommend taking the good bolt and sizing it up to make sure of the size you need.

[Angus67]

Engine is out. Tomorrow, helicoil

[Angus67]

I already had a m6 kit from a previous po’’s screw up

[Angus67]

Pressure washed the engine and roller while apart, and helicoil the stripped hole. With the help of a friend, adam, we got the motor back in the frame.
I took the opportunity to take the back wheel off and check the conditions of the swingarm bushins. A ton of play, and looks like the rubber bushings in the shock eyes are shot. The shock bushes are easy, but were to get new swingarm bushes? And if the swingarm is wallowed out, what to do?

[Ariel Red Hunter]

Pressure washed the engine and roller while apart, and helicoil the stripped hole. With the help of a friend, adam, we got the motor back in the frame.
I took the opportunity to take the back wheel off and check the conditions of the swingarm bushins. A ton of play, and looks like the rubber bushings in the shock eyes are shot. The shock bushes are easy, but were to get new swingarm bushes? And if the swingarm is wallowed out, what to do?Got a little work to do on that swing arm, sounds like. It is unlikely that the swng arm is wallowed out, because that rubber bushing is vulkanised between two thin steel tubes. The outer part of the bushing assembly is pressed into the swingarm, and the inner part is a slip fit on the swingarm spindle. The easy fix is to replace the entire bushing with a bronze bushing, one each side. If you go this route, install a grease zerk in the middle of the swing arm cross piece, and a thin steel tube between the bushes. The steel tube keeps the bushings from creeping in AND directs the grease to the bushings...ARH

[Angus67]

Thanks arh. Grease zerk is already installed

[Weldangrind]

I once took a quad swingarm bushing to the local Yamaha dealer and asked him to try and match it. Since he keeps all of the bushings in the same box, he brought the whole box over to the counter. The match was from a PW80 dirt bike; it was much better quality and cost about $8.00 at the time. I promptly shared the part number on this forum and several members bought the same part. It has held up remarkably well.


Maybe you could try something like that, assuming you can extract the existing bushing without destroying it. Alternatively, you could have bushings turned from UHMW, if you know someone with a lathe.