Maico MC250 - Page 31

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ShU> dULLE11~ ,.

4UOcc

Cooper Motors aoes not recommend Increasing tne "Vuce

engine speed through changing the ports or changing the

exhdUS'

system. Some performance can be gained by widening the Inlet

and exhaust ports as described Stage

of the 250cc bulletin.

For TT performance remove 2.75 inches from the center

cylinderical section of the expansion chamber and reweld. The

main pipe mount will have to be moved the same amount.

SHOP BULLETIN #5

Rear Sprocket Bolts

We suggest that the rear sprocket bolts be secured using

Loc-tite Stud lock grade and then tightened to 10 foot pounds.

Tighten the lock nuts to 10 foot pounds also. Allow 24 hours

for the Loc-tite to harden.

SHOP BULLETIN #6

Rear Wheel S~okes

It is suggested to

~IShSSem~l~ tn.

re.r wheel flange side

spokes and install flat washers under tr,espoke heads. This

keeps the spokes from bending the flange and coming loose.-

SHOP EULLETIN #7

Rear Wheel Bearings

Metal chips left in the rear hub during fabrication will

fallout of the vent holes and cause the rear wheel bearings

to seize. It is suggested to cover over the two vent holes,

located between the wheel bearings. with duct tape.

SHOP BULLETIN #8

Leaking Forks

The front forks will

on top of the fork seal.

on top of the new seal to

leak if dirt is allowed to accumulate

It is suggested to use an old fork

prevent dirt from damaging the new seal.