Stalling Issues

[Road_Clam]

Originally Posted by blaine

Quote:Today I replaced the plug, had to re-tap for it:

Just to bring everyone up to speed ,I gave him a worse case senareo on his problem.In his original post,he stated that he had cross threaded the plug & had to retap the threads.Now his problem is a grinding noise that gets worse as the bike gets warm until it stalls.He leaves it for 20 mins,and she starts again.He has already drained the oil & no sign of any metal shavings.
:cool:

I read the "cross thread" comment as well, I was curious by this as well. I wonder if the plug thread seal is now sloppy and bleeding off a portion of cylinder compression ?

[Old School]

Interesting option, I like it, I'll check it. Maybe a helicoil would fix this?

[Old School]

So would a heli-coil option, then what plug would go in it? YOu guys are giving me the good bad and ugly to think about. Thanks a bunch. I have a couple guys coming over to physically check it out later this week. It is so hard to wait. So keep the comments coming I am considering them all. Here is somthing I was told my my neighbor who is a diesel mech. He said all the shavings would not make it to the oil, they would get caught in the filter, and or blown out the exhaust....?

[blaine]

It's possible that your plug is loose causing loss of compression and a heli-coil would repair that.For your peace of mind you can take the oil filter out and check for shavings.If there is none there,than you may be in luck.
:cool:

[Road_Clam]

Originally Posted by Old School

Interesting option, I like it, I'll check it. Maybe a helicoil would fix this?

You can specifically get "spark plug" heli coil repair kit. You just have to measure your plug I believe they are 12mm ?

[Old School]

Made some progress today. The specific twist on the plug is 12mm x1.25. Trouble is I am having trouble finding the heli coil repair kit for such a size. I don't really get the concept of it though. If I slide the coil over the plug then there is no way it seems like it would fit in the hole...I don't want to tap it bigger and run more risk of additional metal in engine. I found no shavings in filter. My neighbor who is a diesel mechanic said it was not likely that the small amount of shavings could have made it very far on a bike...considering the exhaust blows right out of the head. He determined that the sucking was coming from the plug whole. So throw me some insights on what I just said if you would.
Thanks Blaine for preparing me for the worst. I always prepare for the worst and hope for the best.

[blaine]

For the Heli-coil to work the hole must be made bigger for the heli-coil to thread in.The inside of the coil is the size of the original.I have no experience with Heli-coils,but any research I have done,recommends that a machine shop with experience in Heli-coils do the install,as they are tricky to do properly.Especially when its a head.
:cool:

[DBG]

I used a helicoil on my fiance's mazda. I just moved real slow, and followed the directions to a T, and everything came out just fine. There are also videos on the internet to help ( ) I did this with the head still in place. There were a lot more metal shavings than you would expect. In fact, I got everything back together, started the car, and there was this HORRIBLE tapping noise, and I felt sick at the thought that the piston might be banging against the spark plug ( I thought that I had gone in too far with the HeliCoil). I gave up and had it towed to the shop. Turns out I just had not got all the shavings out of the cylinder, and they were blocking the exhaust ports or something. They rigged up a small hose onto their shop vac and sucked all the shavings out. Easiest money they made that day I bet. After that the car ran great, the helicoil never gave us any trouble.

I might suggest removing the head to do this, just to prevent shavings from getting into the cylinder, but it can be done with the head on. Just make sure you are thorough in getting the shavings out. There will probably be way too much to just blow out the exhaust.