A Huge thanks to Brad for sharing his how-to on the 201. I've done a few and they are as good or better than a healthy MS200. I have had a few 201's that didn't want to give up the Flywheel easily so I though I might share my ghetto puller pics in the hope that it will help someone going the DIY route.
The 2 puller holes in the flywheel are 5mm x 0.8 pitch (coarse) thread, and the screws I used were 2" long, the angle iron was 1/4" thick. The "Puller" bolt was 5/16-18, and I tapped the angle iron rather than weld a nut on, and I put the center point on the bolt using the vertical belt sander (rather than gettin' all fancy with the Lathe).
The angle iron never touched the case while "pulling", although it may look that way, and once I was done Filing the key I snugged the puller down with a pair of wood spacer shims so I had an extended "Arm" to measure the actual degrees gained by lightly seating the flywheel and moving it back and forth with the key engaged in the shaft keyway. I went slow on the filing, with a small Half-round File-using the flat side to narrow the key, BUT, even though I was aiming for 6 degrees, I still ended up overshooting it slightly, winding up with close to 8 degrees by my best Visual interpolation using a transposed degree wheel, and also a small protractor.
The end result with ~8deg. adv., a .410" hole in the Muffler, and 2.5 turns out on the Hi screw was a saw that cuts faster than our best 200T (still a fresh muff modded runner), and after Much cautious testing, and probably 15-20 "Plug Reads", I settled on the 2.5 turns on Hi. I'm at sea level, and both power and plug "reads" suggest that 2 turns out may still be safe and provide max power-But, like many others, I would rather give up a tiny gain for the sake of safety-I will say that 3 turns out on Hi was noticeably Fat, both in the cut and Esp. on the plug. I should also note that I arrived at the 2.5 on a Cool clear 50 deg. F morning and I will be checking the Plug regularly for quite a while going forward to see how sensative this puppy is to the weather.
I did the carb limiter and muffler first, made some cuts, and then did the Ignition Advance. The throttle response and pulling power in the cut after the ignition mod. can't be understated! What a transformation! OK, on to the pics-(I Hope)
Puller in place;
Puller closeup;
Closeup showing the Gullet next to the Key;
Backside of F/W showing side to file in order to gain advance;
Removed bits;
On re-assembly I made sure the shaft and F/W bore were nice and clean, I tapped the F/W home with a socket-It no longer rotated by hand, I looked up the torque spec.--they give you Newton Meters(what else?), and that figure converts to a hair over 18 Ft./Lbs. Sooo, I held the F/W with a welding glove-had a 13mm wrench on the clutch hub as a backup, set the pointer on my Snap-On torque wrench at 10, and with All my Gloved-hand-on-Flywheel "Holdback", I moved the witness needle all the way to 16ft./Lbs.! I guess I'm just plain weak! Regarding sticking a rope in the spark plug hole, I've done that plenty of times on other 2T motors, and using the clutch hub as a holdback might risk tweaking the crank, But I made the Executive decision that 16 was Good Enuf (I did pull the cover after a day and attempt a re-torque-it didn't budge), So I'm gonna go with 16 and if coming up 2 Ft./lbs. short blows up in my face, I Promise to post it here-Pics and all!
I hope this helps or encourages someone who might otherwise leave this little gem "in the rough" This Puppy just needs-I mean Begs(!) to be "fixed"!
But most of all, Thank You! Thank You! Thank You! Mr. Snelling! You are a selfless Hero to the Masses! I actually feel guilty! Like I should send you a royalty--or at least a saw to mod so I can Pay you more than just a compliment!
You Know, Along that line, as it happens, I've got an 044, an "Old-like new" 371xp, and an Old-like new" 394xp...Would you be interested in working your magic on one of those? (WOW! Here I am assuming you actually read this!)...That might be the worst breach of posting etiquette there is! NO Offense mean't--I woke up in New jersey back in 1985 and I've been trying to escape ever since! (You can get in for "Free", But you can't leave NJ without paying a bridge toll (or is that Troll?)-last I checked that is!)
Thanks, regards, Mike
The 2 puller holes in the flywheel are 5mm x 0.8 pitch (coarse) thread, and the screws I used were 2" long, the angle iron was 1/4" thick. The "Puller" bolt was 5/16-18, and I tapped the angle iron rather than weld a nut on, and I put the center point on the bolt using the vertical belt sander (rather than gettin' all fancy with the Lathe).
The angle iron never touched the case while "pulling", although it may look that way, and once I was done Filing the key I snugged the puller down with a pair of wood spacer shims so I had an extended "Arm" to measure the actual degrees gained by lightly seating the flywheel and moving it back and forth with the key engaged in the shaft keyway. I went slow on the filing, with a small Half-round File-using the flat side to narrow the key, BUT, even though I was aiming for 6 degrees, I still ended up overshooting it slightly, winding up with close to 8 degrees by my best Visual interpolation using a transposed degree wheel, and also a small protractor.
The end result with ~8deg. adv., a .410" hole in the Muffler, and 2.5 turns out on the Hi screw was a saw that cuts faster than our best 200T (still a fresh muff modded runner), and after Much cautious testing, and probably 15-20 "Plug Reads", I settled on the 2.5 turns on Hi. I'm at sea level, and both power and plug "reads" suggest that 2 turns out may still be safe and provide max power-But, like many others, I would rather give up a tiny gain for the sake of safety-I will say that 3 turns out on Hi was noticeably Fat, both in the cut and Esp. on the plug. I should also note that I arrived at the 2.5 on a Cool clear 50 deg. F morning and I will be checking the Plug regularly for quite a while going forward to see how sensative this puppy is to the weather.
I did the carb limiter and muffler first, made some cuts, and then did the Ignition Advance. The throttle response and pulling power in the cut after the ignition mod. can't be understated! What a transformation! OK, on to the pics-(I Hope)
Puller in place;
Puller closeup;
Closeup showing the Gullet next to the Key;
Backside of F/W showing side to file in order to gain advance;
Removed bits;
On re-assembly I made sure the shaft and F/W bore were nice and clean, I tapped the F/W home with a socket-It no longer rotated by hand, I looked up the torque spec.--they give you Newton Meters(what else?), and that figure converts to a hair over 18 Ft./Lbs. Sooo, I held the F/W with a welding glove-had a 13mm wrench on the clutch hub as a backup, set the pointer on my Snap-On torque wrench at 10, and with All my Gloved-hand-on-Flywheel "Holdback", I moved the witness needle all the way to 16ft./Lbs.! I guess I'm just plain weak! Regarding sticking a rope in the spark plug hole, I've done that plenty of times on other 2T motors, and using the clutch hub as a holdback might risk tweaking the crank, But I made the Executive decision that 16 was Good Enuf (I did pull the cover after a day and attempt a re-torque-it didn't budge), So I'm gonna go with 16 and if coming up 2 Ft./lbs. short blows up in my face, I Promise to post it here-Pics and all!
I hope this helps or encourages someone who might otherwise leave this little gem "in the rough" This Puppy just needs-I mean Begs(!) to be "fixed"!
But most of all, Thank You! Thank You! Thank You! Mr. Snelling! You are a selfless Hero to the Masses! I actually feel guilty! Like I should send you a royalty--or at least a saw to mod so I can Pay you more than just a compliment!
You Know, Along that line, as it happens, I've got an 044, an "Old-like new" 371xp, and an Old-like new" 394xp...Would you be interested in working your magic on one of those? (WOW! Here I am assuming you actually read this!)...That might be the worst breach of posting etiquette there is! NO Offense mean't--I woke up in New jersey back in 1985 and I've been trying to escape ever since! (You can get in for "Free", But you can't leave NJ without paying a bridge toll (or is that Troll?)-last I checked that is!)
Thanks, regards, Mike
