tzr seizing!!! then starting!!!

cloric_tzr · Brolly Dolly Joined: 13 Mar 2010 Karma :

ok yesterday i fiddled with my power valve because it turns out the previous owner had 'restricted' her by turning her to the wrong position.

so i sorted that played with the tunning and i was very suprised to see the diffrence it made.

then at about half five last nite (3 hours after id done it) i was ridding home doing bout 70 when all of a sudden the bike locked up and slide sideways i luckely grabed the clutch in and rolled to a stop (engine not running so she defintly snagged somthing.)

so there i was standing at the side of the road, i decided to gently push the kick over to she how bad it was. to my suprise no resistance at all so i gently turned her over at least 10 times to she if i could feel any tight spots or clanging rattling etc. nothing sweet as a nut sooo being 5 miles from home i started her again 1st kick then gingerly rode her home dint go above 35 the entire way no problems at all no knocking pinking rattleing clunking anything. sooo wtf happened. have i not tightend the valve properly and the piston has jammed against it an i was lucky enough to grab the clutch before any damage was done or is this going to become a regular problem now. i took the exaust off and the valve didnt seem to have moved. any ideas? rick
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i dumped my girlfriend the other day! she wouldnt act out one of my fantasy's. all i wanted her to do was come home from work, catch me fucking her sister and join in!!! miserable bitch!
My wifes so ugly, the only thing that goes down on her
Is the internet connection.

tutton · World Chat Champion Joined: 04 Jan 2008 Karma :

Have you checked the powervalve blade hasnt hit the piston?
sounds weird the blade wasnt in the right position then when it is you get that. either way its likely its fucked now, even if its nipped up itll now be loosing compression, so get your wonga out for a top end replacement soon Laughing

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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

richbike · Two Stroke Sniffer Joined: 29 Mar 2010 Karma :

TZR rotary YPVS shouldnt hit the piston unless its properly humped in which case it would be a write-off. Might be de-restricting it has uncovered a problem with 2-stroke supply (or general knackeredness) causing it to nip up at higher revs.

check the plug for running lean and make sure the autolube system is OK

cloric_tzr · Brolly Dolly Joined: 13 Mar 2010 Karma :

richbike · Two Stroke Sniffer Joined: 29 Mar 2010 Karma :

was it running hot when it seized?

cloric_tzr · Brolly Dolly Joined: 13 Mar 2010 Karma :

no not at all that was 1st thing i looked at not even half way usual runnin temp
____________________
i dumped my girlfriend the other day! she wouldnt act out one of my fantasy's. all i wanted her to do was come home from work, catch me fucking her sister and join in!!! miserable bitch!
My wifes so ugly, the only thing that goes down on her
Is the internet connection.

oldbiker · Nitrous Nuisance Joined: 15 Nov 2009 Karma :

I guess its a 2ma\1kt or reverse cylinder 3ma.
visit the tzr250 forum and quizz the geeks.

But I would get the barrels off and check it out.

Other things to look for are a lack of coolent (is the pump working),

air locks in the oil line (mine are clear plastic Idea

),

have the rings been in for a long time? they go in with about a 15thou end gap and it`s good practice to change them every 5000 miles or so on a tzr (use genuine or a decent jap set such at RIK.

But its worth getting a manual on line
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It`s all powerfull white mans magic
https://i897.photobucket.com/albums/ac178/tzrsteve/album%201/035.jpg

Blau Zedong · Banned Joined: 26 Jun 2006 Karma :

cagiva gezzer · World Chat Champion Joined: 17 Mar 2003 Karma :

You didn't up the jetting when you de-restricted it so it ran lean and seized. As above, rebuild time for mucho money.
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"because one stroke isnt enough and four strokes waste two"

cloric_tzr · Brolly Dolly Joined: 13 Mar 2010 Karma :

cloric_tzr · Brolly Dolly Joined: 13 Mar 2010 Karma :

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Don't think there were jetting changes needed on the TZR125 when derestricted. The Yamaha manual doesn't specify different jetting for the UK restricted bikes.

Agree with Richbike that the piston shouldn't be able to touch the power valve

Personally I would suspect that either the oil pump was wrong adjusted, the oil supply was interupted or there is an air leak.

Chances are pretty high that the piston is wrecked and that it needs a rebore.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

cloric_tzr · Brolly Dolly Joined: 13 Mar 2010 Karma :

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

cloric_tzr · Brolly Dolly Joined: 13 Mar 2010 Karma :

are normal vaniers acurate enough to mesure my piston? im getting a reading of about 56.4mm which is the standard size for my bike im just nervous of ordering a new piston going on tht mesurement because i no digital 1nz are more precise. i cant afford to order the wrong piston as i need the bike for work. im getting a exact mesurment of 56.4mm fom the cylinder and a messurment of 55.9 from the piston (i think there abouts) so im guessing that i need a standard piston. will oversized piston have the size stamped on the top?
____________________
i dumped my girlfriend the other day! she wouldnt act out one of my fantasy's. all i wanted her to do was come home from work, catch me fucking her sister and join in!!! miserable bitch!
My wifes so ugly, the only thing that goes down on her
Is the internet connection.