still cant figure out the specs on my motor

Discussion in '2-Stroke Engines' started by oliveclown, Aug 6, 2008.

  1. oliveclown

    oliveclown New Member

    its a craftsman chainsaw, 12", 2hp (I suppose), model # 358-352060. The only things I could find online was the owners manual with parts explosions/numbers and that the "358-" designates it might be a copycat from Poulan, but trying to cross reference part numbers didn't get me anywhere, so thats all I got. :cry: Just looking for the cc's and peak hp/rpm.

    Also, as a side question, this chainsaw has a centrifugal clutch of course, but its on the very outside of the shaft. So I dont know how to easily get a sprocket on there for a chain drive. weld it on the drum? lol. Ive never torn one apart and im not sure how to approach it as far as finding a home for the engine sprocket. is there a easy way to tear the clutch off. okay thats it for me, once i figure there two things out i can really get moving with this project. hoping to have her ready soon cuz my transmissions slipping good now and i dont even have the funds for a picknpull. so its soon time to retire the jeep! Thanks fellas!

  2. autobo7

    autobo7 Member

    Most chain saws already have a sprocket attached to them to move the chain. I would guess you can pretty much just remove the chain guide and saw chain and feed the bike chain into where the blade was. They are a pretty perfect fit for this application, i would guess it is less than 50ccs. Most small ones are in the 25-35cc range, so a big wheel sprocket would help to keep from burning clutch
  3. oliveclown

    oliveclown New Member

    i didnt think a bike chain would fit the chainsaw sprocket? I guess ill try er out.
  4. oliveclown

    oliveclown New Member

    the teeth are too wide on the chainsaw sprocket. Ill rip the chain off the bike to make absolutely sure it wont work. i just sortof wiggled the motor on the bike with the chain attached, but it was a no go. the more I look at it the more I just want to get a sprocket and weld er on the drum. Oooo, maybe put some kind of mount on the drum so I can swap with different sprockets. Ill try to get that clutch off tomorrow and see how that goes first maybe. But thanks for your insight autobo7.
    Last edited: Aug 6, 2008
  5. Nuttsy

    Nuttsy Member

    Depending on the age of the machine, Sears Parts Dept. may have the info you seek. Try contacting them with your numbers.
    Another option would be if you have access to calipers. You could remove the head and do some measurements and math. That would get you precise CC's. But as stated above, it's gonna be in the smaller range for a 12" saw.
  6. oliveclown

    oliveclown New Member

    yeah im sure its mid-20s to mid-30s. ill check with those guys. I probably wont pull the head just to measure cc's. I mean I know I'm "legal" but I was mainly just curious and thought it would help with the gearing. I don't think I have to know exactly, right? Thanks Nuttsy!
  7. Nuttsy

    Nuttsy Member

    As far as gearing goes, the figures depend more on RPM, wheel size, and drive and final gears. Of course HP figures in too when you add up your weights, and hill climbing ability. I guess size does matter :)
  8. oliveclown

    oliveclown New Member

    Well sears parts dept. was useless. Way too old of a machine for their records. But I may have figured out the cc's myself. I thought the 2.0 on the saw was for hp, but apparently its for cu in. Duh. So that equates to aboot 32cc's. The guy said he would have no way of finding the peak rpms. So I don't know what to do now. Guess? Think 13000 sounds good? I mean, what would you fellas do at this point?
  9. Bronzebird

    Bronzebird Member

    find a local chain saw repair shop

    Those guys can take a look at it and tell you how much of a load and rpm range will work. Then crunch out the numbers for weight to gear ratios.
  10. machiasmort

    machiasmort Active Member

    Check the motor itself

    engine should have a tag on it identifying model/spec. Look on the engine itself. I've got a book here and might be able to help you. The number you posted is a craftsman tool number not the motor info.
    Last edited: Aug 15, 2008
  11. oliveclown

    oliveclown New Member

    The only other numbers/jargon ive found are:
    phelon 12
    us pat 3828426
    and 227

    all of these are on the magneto wheel (i guess its called). thats all i found, unless i need to tear it apart more to find more numbers.
  12. JemmaUK

    JemmaUK Guest

    Assuming its a two stroke and given the application I would guess its more like 8000rpm than 13000 although with carb and pipe mods and various other modifications you might be able to get 13krpm out of it.

    if you can get the engine set up and running in a bench mount you might be able to beg/borrow one of those little sight rev meters used in model aircraft which would give you the rpms of the motor..

    Otherwise the manufacturer would be the place to try. Engines *will* have a number or code on them somewhere that you could use..

    beyond that its the local small small engine repair shop - they tend to have more knowledge of unusual or old machines. Dont take it to a large place, they'll just look at you as if you have two heads - a small local place might help you though..

    good luck

    Jemma xx
  13. oliveclown

    oliveclown New Member

    Cool! Thanks for the help. I'll have to locate one of those rev meters.
  14. JemmaUK

    JemmaUK Guest

    Phelon is the manufacturer by the look of it (looked up the name on the web).

    Which would make it a Phelon Model 12 - whether that refers to the engine as a whole or the magneto model I dont know - it looks like the magneto from what I have read.

    It might be a Ryobi engine from what I have found on some of the r/c aircraft forums... and on that it is giving top rpms on a 31cc engine as 6800rpm.

    hope that helped

    Jemma xx
  15. oliveclown

    oliveclown New Member

    Holy cow. My google must be broke. You are a master of searching. Thank you Jemma! I'll follow up on your leads.
  16. oliveclown

    oliveclown New Member

    I found it, i guess i wasn't specific enough when i searched. thanks again.
  17. oliveclown

    oliveclown New Member

    Okay folks. Now I just wanna run my gearing setup by yinz to see if you approve. So...
    32cc 2stroke, 6800rpm, 26" tire
    270lbs rider with hilly terrain.
    Now looking at this, I decided I would want gearing of about 33:1, which would take me to almost 16mph, which just isn't fast enough. So, using a parts bike, I was going to make the jackshaft with multiple gears on BOTH sides of the shaft. I'll put the front deraillur and gearing on one side (driven by motor), and the rear deraillur and freewheel on the other (sending power to wheel) for 18 speeds on the jackshaft.
    See,for hills, I'll have a 6t on the engine, then a 50t (biggest sprocket of the three) on the one side of the js, then a 14t (smallest of the 6) on the freewheel, back to a 56t on a ht sprocket mount. Then for max speed I could shift gears all the way to 6->28(smallest)->28(biggest)->56. Do you kinda see it? Its like riding three bikes at the same time. The only thing I'm hung up on is the freewheel will be going backwards (freewheeling) with my driveline setup (i want to use my parts bike rear hub assy as my jackshaft, leaving the rear gears on one side of the wheel and adding the front gears to the other), so I'll have to see if I can flip the freewheel on the hub so it can go the other way, if its possible. Might be easier to just do without the freewheel and make it stationary on the axle. So, any more insight? If you need me to draw pictures I'm pretty good at that. Thanks so much for the help thus far. I wouldnt have even attempted this proj if it werent for this forum.
  18. oliveclown

    oliveclown New Member

    Nothin? Maybe I should start drawing that picture. . .
  19. loquin

    loquin Active Member

    I don't think you need all 18 speeds. Just use one derailuer.

    Also, take a look at kerf's Two Speed Staton thread.
  20. oliveclown

    oliveclown New Member

    I know I don't NEED 18 speeds, but I liked that I could go from a 36:1 to a 9.33:1 ratio, so there would be no problem on any hill, and I could zip around 56.4mph on my suspensionless bike if I wanted. I would probably pick my favorite gear on the 6 sprocket set and then just shift the big 3 sprocket derailuer for most situations.

    And I have studied the Two Speed Staton, part of the inspiration for my project in fact.

    I think I'll run my setup as described, except I'll make it a front wheel drive. That way I can mount my wheel sprocket on the RIGHT side, which would eliminate my freewheel issues. If it works, I'll step up to a full suspension bike, but this will be a prototype.

    Thanks for your help, Lou.