Flywheel keys

[2or3wheels]

So i broke a flywheel key. No biggy, they make me buy a 10-pack but oh well. I put new one in engine sputters because i havent been able to get it tuned yet. Broke another key. Then same thing. Now im wondering if i broke another today because i got frustrated and said eneugh for today. Anyone got any ideas? Is it the wrong metal composite? Its the only one in the Primeline book we looked at that was similar to the old one.

 

[RobertD]

Wow... broke a key. Hmmm. I don't know. I buy them from the local lawnmower repair place. Maybe they've got some hardened ones?

 

[2or3wheels]

Thats where i went first. Im going to have my dad take a look. Im going to have to go there tomorrow anyways for a cable for my mower so i think ill ask them.

 

[2or3wheels]

For got to mention this is the re-built motor, with tons of compression, could that be it too?

 

[funky ole]

fly wheel isn't tight enough.torque to 75 ft lbs. don't use a hardened key,will tear up the crank and flywheel.another thing to try is valve lapping compound on crank and flywheel taper.gives enough grab to lock them in position,use a little bit not alot.

 

[2or3wheels]

I just tighten the nut as hard as i can. I believe i was putting the key in the wrong way. Thew key it uses is cut out and was putting it in backwards putting 1/2 the key in the flywheel. Still cant get the motor to idle. I have to start it wide open choked. once its warmed up it was still the same. i got the high speed needle good but to get it to idle the idle screw is so far in that its reving way to high and wants to go bye bye. Any ideas. Its a normal tuchumca carb.

 

[2or3wheels]

I got a carb rebuild kit if that doesnt work then nothing will.

 

[athif]

spend a good buck and get a reinforced one for 10 bucks, its well worth it, TUFF STUFF

 

[2or3wheels]

Well the one for an HS 50 is cut out on a side and i put it in backwards so only 1/2 the of the flywheel had a key metal in it, so 1/2 less surface area and a strong rebuilt motor= broken ones. I fixed it now i need a carb kit, but im working on a mini motorcycle now.

 

[philip metzner]

something is wrong. the engine doesnt realy use the key to hold it, just align it. there is a burr on something, the nut is to loose, the concave washer is missing, or something. i have run a 5 horse briggs making neer 15 horse power at 10,000 r.p.m. with no key at all!!-phil

 

[2or3wheels]

I got it fixed. I know, my problem was when the key would break the flywheel wasnt turning but the shaft was. So i had no spark.