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Discussion Starter · #1 ·
Hi, iv just got my tzr back from Yamaha and i had the piston rings changed since they were shot and my engine has been bored out.

Do I have to run my engine in? And if so, for how many kay's?
Does anybody know if Yamaha would change my power valve setting back to normal if i've opened it up previously?

Thanx for any help,
Kams.
 

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in kays?i take it you got a european bike then?in miles, just take it easy mate,dont go into the powerband for about 2-300 miles mate
 

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well for at least the first 100 miles i would say do 30 mph. then for another 100 dont exceed around 60 mph

then just gently for another 100 miles if you wana be safe.
 

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if in doubt ask your yammy dealer.they generally are friendly people, and with bikes as old as ours, it does help to get some kind of relationship going with your dealer
 

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Discussion Starter · #7 ·
i would have thought the running in instructions were in the haynes?

perhaps not though, they would deffo be in the original handbook.
Well if i had the haynes manual with me i wouldnt have asked the question in the first place would i?


slightly off topic i suppose. where does everyone get their piston kits from, ive had a browse or two but cant find wiseco piston kits!
Go check in your haynes handbook why dont you Greg 656?!?!

Anyway, to everybody else, thanks stacks for the help...much appreciated guys
 

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Hi I was just wondering what problems might be caused if new piston rings aren?t worn in properly. I have hear it can cause heat spots on the rings, which could break them or wear them down a lot,,, is this true?
Thanks
 

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when you put in new piston and rings,they are relatively soft,and require "hardening"which is done by getting the engine hot over short periods, and letting it cool down.this is not always possible on a road bike, which is used as everyday transport, so the method used instead, is slowly building up the heat, over a longer period of time, by keeping the revs low and increasing gently.if you just thrash it straight away, you will wear the rings,and piston contact points and increase chance of seizure. although there is no short term problems with running it like this, you will find you will probably have a smoking heap within 5-10 thousand miles, which just negates the point in changing them in the first place
 

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OK children, let's stop the fighting now! We can all get along... Manual or no manual...
 

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Well, I know this isn't strictly relevant, but on my CBR...

I got told by the dealer:

"Speed isn't a bad thing, just don't go doing full throttle starts and stuff like that for the first 300 miles, oh, and pick a nominal value about halfway up the rev range and try to stick below it".

My Owner's Book (again, for the CBR so not 100% useful) just said "Avoid full-throttle starts and ensure you warm your engine up properly before riding, and don't rev too high for the first 300 miles or so" (that's a rough translation from Honda to English).
 

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watch out for the ring peg on the tzr pistons i had one that failed at 10,000 miles then the piston ring turned around in the bore and then rebore was needed, you could try running in the engine for 750 miles no more than half throttle and no more than 4,000 rpm to 4,500 rpm for the first 400 miles then at 400 miles up the revs to 5,000 rpm and blip the throttle in between the gear changes then at 600 miles just start to go in the power band and then at 750 miles as normal,
also no constant 50 mph you could run the motor in on the back roads loads of gear changes
 
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