rearenginekarts.com

hi guys,
a little soapbox first
in the interest of sharing information and helping others get going in this hobby i'm posting this.
To me it's the help from others freely given that will promote Vintage Karting and assure its future.
I've found there are some that like to know more than others and won't share.
Might i suggest the Hoarding information and suggesting massive investment in magazines to get the info is not the way to be in a hobby.
hope it helps
dave
So heres the torque values for a mc motor as set forth by Mike Savin in his booklet "Speed Secrets and Tuning Tips"

torque values
Coil/lamination Screws ------------55-60 inch pounds
Condenser screws ----------------30-35 inch pounds
Con rod - mc49 mc 91 -------------105-110 inch pounds *
Con rod - mc101 ---------------90-95 inch pounds *
*a master mc builder told me told that 101 rod bolts with 85-90 inch pounds and red loctite is bullet proof
and torquing to 110 results in cracked caps.i myself do 85-90 inch pounds
Crankcase End Cover Screws --------60-65 inch pounds
Crankcase Bottom screws -------- --95-100 inch pounds
Cylinder Head Screws -------- --55-60 inch pounds
Exhaust Header Screws -------- ----55-60 inch pounds
Fan Housing Screws ----------------55-60 inch pounds
Flywheel nut ----------------------300-360 inch pounds
Spark plug -----------------------216-264 inch pounds
Clutch Nut ------------------------ 260-300 inch pounds

Bonus info:
the following piston to cylinder clearances are recommended
mc49 series .0045 to .0055 inches
mc91 series .0065 to .0075 inches
mc101 series .0070 to .0100 inches

hope this helps
D

Thanks Dave, that is really good information. I have never heard that about the 101 Rod caps. I always thought that 90-95in-lb was plenty anyway and I have never had one come loose so far.

It was good to meet you at TBO and finally put a face to your name.
Thanks again,
Scott

David,

Very cool... Thanks for taking the time to post that info.