P.V. repair method

J

jaydougempire

Guest
Could someone give me the exact proven procedure to repairing powervalves?
 

To do them properly you'd need a lathe... Some guys sleeve them but I'm not sure how they do that. To do it on the lathe you have to remove the tip of the valve, drill and tap hole, then insert a SS bolt, then drill and cut you slot in the tip of the valve. Pretty simple to do if you have a lathe or access to one.
 
Cooper0809 said:
To do them properly you'd need a lathe... Some guys sleeve them but I'm not sure how they do that. To do it on the lathe you have to remove the tip of the valve, drill and tap hole, then insert a SS bolt, then drill and cut you slot in the tip of the valve. Pretty simple to do if you have a lathe or access to one.
Click to expand...
Yep I have all the neccessary tools. Lathe, mill welder etc. Do you have pics before and after? Its anodized aluminum correct? Are you replacing any of the material that you machine off in anyway? What's the ss bolt for?
 
The SS bolt will take the place of the part you machine off,which means you will actually have to have a bolt with a thick hex head the same thickness as the part machined off.
 
Ok so you dimension the valve. Then put the valve in the lathe part off the pull thru end. Face it. Center drill it. Then drill and tap it for the bolt. Red loctite the bolt in and tighten it. Then turn down the head of the bolt to the profile that the valve used to be. Then take it to the mill and drill it out for the cable end. Then slot cut it. Then relief cut it on the underside of the slot so it doesn't muff up your cable. Any questions?
 
Jay, I had pics but not sure I have them anymore. Here's a little drawing so you can understand a little better. Feel free to comment on fine art! Lol so you need to shave off the top portion (hole & slot) where it says remove.

Then you'll need to drill and tap (dotted lines) where you just removed that top portion. I'm not sure of the size of hole or tap sizes you need to use, but I'm sure you'll use good judgement...or maybe others will chime in to help if they know.

Then you'll need to take the SS (stainless steel) bolt and insert into the hole you just drilled and tapped...again, I'm not sure what yamahead used to secure it in there. Maybe red loctite??? Idk...

You'll probly have to let it sit for a bit while whatever you use to secure it cures properly, then stick er back in the lathe and make the head of the SS bolt round to original measurements....height & diameter.

Then you'll need to drill the little hole where the cable end slides into to original measurement and then cut your slot in the top to original measurement.

Then debur as nessessary, especially inside the slot & hole...burs will wear on the cable...

That should be it! The SS is very hard and probly will never have another pull through again.
Also, not sure if it's anodized aluminum or not...I'm guessing it probly is though...I know it's coated forsure with something.

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