Thinking of buying a TZR

[Matt-]

Well title say's it all,

Thinking of buying a TZR for a project so ive got some questions...

Have any of you ever rebuilt a TZR engine ( Fully )
if so how easy are they to rebuild & what parts will i need for a full engine rebuild?

if i do get one what year should i go for?

[Amreet]

depends which TZR you're talking about!

[Matt-]

Just a TZR 125 with power valve hopefully !

[Amreet]

Lots of them about, most have been abused but plenty of parts around and quite a well understood bike on the whole, shared lots of yamaha parts bin stuff as well, an engine rebuild should be straight forward, plenty of material on the internet about rebuilding powervalves etc. try Yambits for parts,as for year, it doesn't matter, get the best kept example you can afford.

[RSnoobie]

TZR is a good choice, they are fast bikes and in my opinion the most reliable single cylinder two strokes. It shouldn't take long to find information on rebuilding on the web, you might even be able to find a manual for engine rebuilds i don't know.

As for year i would try maybe 97 98 models, they have power valve i know that.

Goodluck anyway
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Current Ride: Aprilia RS 125 fp '00

[Drake]

why not get a 250?
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was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box

[Suntan Sid]

I've got a tank you can have, just pay the postage, PM me if you're interested.
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"Everybody needs money, that's why they call it money!"

[Matt-]

Well it's going to be a project so i don't care what the body work condition is like etc etc.. I'm a car mechanic but i have always fancied a bike project, yeah they are reliable i know that, my mate had one with a stage 3 head it ran all day flat out and never let him down!
i would have gone for an RS125 Power valve but they have plated barrels and tend not to last as long!

any views on this bike would be appreciated?

It's a bit of a worry knowing i could buy £300 worth of crank,bearings,seals,and piston to fuck it up :/

any thing i should look out for or should do when rebuilding ?

[T0MMY]

I used to have one of the older ones (late 80s one). Good bike I thought but then I had nothing to compare it to but my TS50X.

Just to clarify they all have powervalves but not all have the servo to open it on the fly. Without it you can still open the powervalve but you'll have bugger all low down torque as it'll be open all the time. You will get the full top end though...maybe 90mph or so?

I did rebuild mine but I really can't remember much about it plus I was utterly clueless back then. I pretty much took it apart for the hell of it as I recall...it was still running
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ZX6R + CBR600RR

[Barnaby]

[Matt-]

[symonh2000]

I rebuilt an E reg TZR a few years ago.

The engine is really straightforward to rebuild although it seems quite common for the right hand side casing to be damaged near the chain sprocket.

My one had the corner broken off where the clutch spring attaches and the casing had a crack.

The crack was tig welded and I made a bracket for the clutch spring.




I never did get a powervalve servo on mine, but I did remove the powervalve collar on the righthand side which allows you to position the valve pretty much where you want. If you get it in the right place you can get a reasonable amout of top end without sacrificing the bottom end too much.

I managed to get mine to do about 85mph top speed, but managed to keep a decent amount of bottom end torque.


The engine still isn't as good as the non-powervalved RD125LC engine was though IMO
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Four strokes is two strokes too many.

[Matt-]

[WannaBeDude]

Do a mito mk 1 7 speed 35 mm carb ...
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Jogging on, destination living.

[Matt-]

[cloric_tzr]

i got a tzr rebuilt it 2wice, im taking it into work next saterday to finish her off, (project has ended up spanning a year and a half due to me son being born) ill get some pics uploaded, there is a thread somwhere,
really simple bikes to work on i picked my up for £300. powervalve open fully did a ton, ive bore'd her out now so be intresting to see how fast she goes, biggest issue was the crank seal was leaking gearbox oil into my bottom end causing a lot of smoke and fouling on the plug, im going to be selling mine i think when shes done, i want a suzuki rg or a mito, ill have a spare haynes book of lie's for a 88' tzr if you do end getting one i dont mind passing it on, it was pricless for specs and tollerance for the re-bore things like that.
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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.

[Matt-]

[Old Git Racing]

Get aTZR 125 as a project, then build it exactly as it was when it left the factory, cos they were good bikes to start with.
1st step, get everything as it should be, i.e. blue print it. match barrels to cases, get rid of the big stepand blunt edges in the inlet and gas flow it like it's supposed to be, check powervalve opening and closing times, piston to bore clearance, end gap etc.
Then get the crank out, dynamicaly balance it after checking end float, bearing condition etc.
Assemble the engine dry on a bench and stick some solder down the plug hole and check squish clearance (with head gasket and head torqued down correctly), machine the head to get the spec clearance.
Check port heights and matching of ports to cylinder liner, adjust to suit.
Check ignition timing and carburation.
Do all this and get an engine that should be as originally designed and to spec but totally standard and see the benefits.
Then start changing things that really matter (stage 3 cylinder heads aint included here) and with a lot of work and knowledge you might just get it to run better than standard.
Alternatively just give the engine to someone like Mick Abbey or another bloke who understands strokers, who will do it for you for a few quid and do a really good job.

Seemples init?

OGR
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2022 Tiger Sport 660 2019 Street Twin 2003 K3 gixxer 1000 1998 Srad 600 track hack

[Teflon-Mike]

[Matt-]

[Korn]

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3516 Miles, 11 Countries

[Drake]

[symonh2000]

The Haynes Manual is pretty good for the TZR.

You can often pick up used ones cheaply on ebay.

They are really simple to do though, although when I did mine the first time I managed to get part of the gear selector mechanism in wrong and I had no gears.

The removable section of frame makes getting the engine out very easy too.

I reckon you could have the engine out rebuilt and back in in well under a day if you put your mind to it.
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Four strokes is two strokes too many.

[Kickstart]

[Barnaby]