Frequently Asked Questions
Q: How are you different from other engine builders?
A: We believe in lower volume, higher quality work. Other builders have too many engines to rebuild, and cannot spend the required time on your motor! Unless you are a "national team" you get the standard in, then out the door rebuild. Each motor is different and attention to detail is a must!

Q: What spark plug should I run and at what gap?

Yamaha CAN Classes JR/SR Autolite AR51 @ .040
Comer K-80 NGK BR10HIX @ stock gap
Yamaha Pipe Classes/FY Autolite ARZ592 - stock gap
HPV - All Autolite AR51 @ .040
Shifter 80/125 NGK BRIOEIX - stock gap
KidKart 50cc Bosch R0971 #WS5F

Q: What fuel and mixture should I run?
A: 108 octane leaded fuel with 8oz Burris Castor per gallon.

Q: What kind of maintenance is expected of my MCR Engine between races?

  1. We recommend replacing carburetor kits every 2-3 races.
  2. Change spark plugs every qualifying.
  3. K-80 - every 4 races - MCR check up, change springs in clutch, kitcarb, clean ex. muffler, and clean carbon off head.
Q: How often should I have my motor rebuilt?
A: Usually our customers get between 4-6 races on Yamaha and HPV's and 7-8 races on Comers. These estimates vary from motor to motor, depending on use/abuse and casting imperfections in parts. When calculating race time, figure in test days as well. (Example - 2 races with 4 complete days of practice equals 6 races.)
 
 
    
     

MCR Engine Development
3161 Pegasus Drive
Bakersfield, CA. 93308
Phone: (661) 399-3580
Fax: (661) 399-3584