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Vicegrip · #1 04-06-2018, 07:37 AM

Found a 1/1 scale 2 stroke motor model kit for the Boy to build. He built the plastic 1/6 scale Porsche 911 motor in a sitting and then modded it so the timing would work properly. I figured he was ready for a model that was a bit more realistic.

As a bonus the kit does not come with any pictures, hints or instructions at all.

JmuRiz · #2 04-06-2018, 08:57 AM

Stihl chainsaw?

Vicegrip · #3 04-06-2018, 02:21 PM

Sort of... This is a box of 100% non original Stihl parts that turn into a MS-660 clone saw when assembled. It is sold as a parts kit and is very inexpensive, more so when I found it in a super sale. Less expensive than some motor models I was looking at. Just looking at the parts I can say I will not be replacing my Stihl MS-460 Magnum with this one as you often get what you pay for. Everything is the same size and shape and parts from this kit drop into a real 660 but everything is also just a bit off as you would expect from something that cost a small fraction of the original. A real MS-660 is a big beast of a chain saw. With 7 hp stock you can run a 32 inch guide bar with non skip chain and still lean into it.

YouTube

That said lots of folks build and use them. In this case it is not to use but to have the Boy build and tune a motor. When it is finished it will be ever so slightly more useful than a plastic 1/6th model.

JmuRiz · #4 04-06-2018, 03:53 PM

Cool!

Too Tall · #5 04-06-2018, 08:43 PM

You have to appreciate that. Nice project.

Vicegrip · #6 04-09-2018, 08:38 AM

We finished up the kit. Everything is just a bit less than a real Sthil but it all goes together and runs. I don't expect it to last like a real one but it would be a good saw to complement a home owner / wood burner type profile. This one bucks the real big stuff and a good smaller saw does the rest.

One item that gave me pause was the wrist pin and roller bearing. On a real Stihl you have to heat the piston to get the wrist pin in or out. On this one it slipped right in. I also got to spend an easy Sunday am listening to "Wait Wait don't tell me!" while slurping coffee and dressing all the ports where they transition to the cylinder. Not unexpectedly the cylinder was cast and machined without any final finish work around the ports. I also suspect the cylinder wall chrome is not a thick and hard as a real Stihl. This kit is not a Lego or Ikea kit. You need to have some prior chain saw motor exp or it would be a real frustrating thing.

4 or so pulls to get it to cough and 10 min of dialing it to a OK tune. Need to run a tank of gas through it and then final tune with the tachometer to see it has the power of a real MS-660. Right now it easily feels strong and revs up with no lag but I have not run it through any big wood yet. Ballsy deep old school saw exhaust note. It starts up just the same as my real Stihl MS-460. Cold = 2 pulls at full choke to get a "cough" and one or two pulls at 3/4 choke. Warm = one pull at Run.
To put the saw size in perspective the bar is a 28", the Boy is 5'10"
(Contrary to the images here he has eyes and we have proper chaps and face protection which is used when cutting and yes, he dipped the bar in the dirt on the first cut.

. We were doing some easy low mid rpm cuts to run in the saw a bit and to set the oil feed rate).

TurboPooch · #7 04-09-2018, 08:18 PM

That's cool. One of the things I did when boy was younger was to bring home weedeaters from work that the maintenance guys had deemed "no longer usable/rebuildable" and he would sit at the workbench in the shed for hours taking them apart and putting back together to see how they work. He now does almost all of the maintenance on his race car and can remove the engine, rebuild brakes, drop the tranny, do an alignment, etc. by himself. Seems very few kids have interest in this kind of stuff anymore.