Some engines ( non TR specific) have a slight rattle until oil pressure
builds due to oil pressure fed timing chain adjusters, others ( like air cooled
motors ) have generous clearances and tend to be noisy.
All of what I'm driving now has a carb, I crank the engine for 5 seconds then
pump the gas once to set the choke. This cranking gives the oil pressure a
chance to build or at least get a head start.
Piston rattle will be most noticeable when cold, more throttle is used and
when at a certain rpm range. Aluminum pistons expand at a faster rate than
iron
so they are set slightly loose when cold. The pistons tend to wear more
rapidly than the cylinders making the noise more noticeable. Driving with
light
throttle when cold and avoiding the resonant rpm range will make the motor live
longer.
Is this TR motor known for cracking piston skirts? Some engines have weak
skirts that crack when worn. Other motors can run for years without a problem.
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