FS90/110/130 Parts swap. I learned something today....

[alexcagle]

Not a chainsaw...... but
.......I had about 6 dead 4130 series trimmer powerheads, so I gathered up the best combination of parts and put a 40mm (fs90) together. When I put the cam and lifter pins in, I didn't realize it at the time, but the FS130 pins were about .020" longer. I assembled the clamshell and timing cover with yamabond, and it fired and ran on the first pull. From there is was untunable, and was idling really high, so it was obvious that there was an air leak. I thought maybe I hadn't let it dry long enough, since it only takes about 20 minutes to slap everything together.
A quick pressure test on the crankcase revealed the timing cover wasn't sealing worth a hoot. After measuring the pins I realized what was wrong.
Lesson learned. I thought I would pass it along.

 

[HarleyT]

Must have some gunk in your holes, both ipls show the same part numbers.

 

[ANewSawyer]

Yes, but in my very limited experience, IPLs aren't always right. They should be but aren't always. Or that could just be my inexperience showing.

 

[HarleyT]

Posters here aren't always right either, but, you are correct, once in a while, an ipl can contain a mistake.

But, in this case, I doubt it.

 

[alexcagle]

Posters here aren't always right either, but, you are correct, once in a while, an ipl can contain a mistake.

But, in this case, I doubt it.

............................................
That thing ain't going to run with one valve is it?...... lol

 

[DND 9000]

Yes only one valve on the drawing shown, but quantity in the ipl says 2. For me it`s no real mistake.