choice of oil and running in rebuilt engine

[grumpuszed1]

hi all, ive just spent the best part of ?800 rebuilding my zed 1 b engine, top end only. re-bored to 0.5mm o/s new pistons,rings,wrist pins,cam bearings,valves,vavle guides and the like,when i spoke to the guy who did the re-bore about running in he advised me that it did not need it, he said to ride the bike normally(without gunning it of course) he also said not to use synthetic oil as this works too well and would not allow the rings and other components to bed in! any feeback from people who have done rebuilds of this nature would be a great help, thanks very much. Graham P.

[steve rees]

I had my z1r rebored last year and the guy (proper good mechanic) said to run it for 500 miles and change the oil and filter (good sense) and dont use synthetic oil it glazes the bore--only use what the bike would have used in its prime of life 10w-40 gtx or similar

works well

regards


Steve

[Rich]

Use mineral oil only, first oil and filter after a few miles - basically warn the engine up then drop the oil, then at around 300 then again at about 3,000. Run it in like you ride it, if you stop at low revs the bores will glaze - you need to put it under load so the rings bed into the bores and don't just polish the surface. Just keep the engine temp down. The first oil change is the most important.

[Pigford]

Agree with above!
Ride it normally, but don't thrash the arse off it for first few hundred miles.
Use common sense and just treat engine with respect, warm up well and be sensible, listen to the motor talk to you
Gradually increase 'hard use' after a few hundred, but NEVER labour engine! "ie: NO high gear with WOT (wide open throttle) up hill, etc", and use mineral/cheapo oil first few hundred miles to aid running in, NOT SYNTHETIC.
Popular belief says don't use synthetic at all, as the roller bearing cranks like decent mineral oil better. The synthetic is believed to make the bearings slip instead of spin in the housings and wear 'em flat

[grumpuszed1]

thanks for the advice,will take it on board,

[z1000Chris]

Also using a synthetic oil might make the clutch slip.