TZR Problem confirmation

[Billing]

Hi guys, I'm having a little bit of a problem with my first TZR.

It's a cnut to start, even though the carb is clean and not sticking, and when it does start, it runs for a little while, but then cuts out and won't start for ages.

The gearbox oil is cloudy and white, but the coolant level isn't dropping, and the coolant is still bright orange in colour (as it was when I put it in. Could this be evidence that the cranks seal (s) have failed? if so I'll be ordering a set from Yamaha on wednesday when I'm up that way for my mod 1
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'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[shadowbiker]

My mates bike ive just fixed had the same sort of problem, was the headgasket on his 07 plate derbi senda might be worth checking that as its easy enough to do before everything else.

Hope this helps things

[Billing]

head gasket is a brand new genuine yamaha item, fitted to a freshly flatted off head and barrel, also its not using or gaining any water, or any of the other symptoms id expect to find if the h/g had gone
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'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[shadowbiker]

does it bump ok ?

could be rebuild time any photos of said problem ? also did you change the rings with the barrel and head ? also when was the oil last changed ?

[Kickstart]

Hi

The milky gearbox oil could just be from condensation, especially if it has been sat for ages and just attempted to start with no long runs.

Worn crank seals tend to result in a very high and weak idle.

All the best

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

[Vincent]

Have you had a good look at the carb?

[oldbiker]

I`d start by checking that you do not have a problem with fuel starvation,(crap in the fuel lines)-remove the pipes from the carbs put the fuel tap on prime you should get plenty of fuel flowing.

clean all the jets with carb cleaner and a blast of air.

I`s unlikely to be ignition or rings\piston ware going on what you said.

after that I would be looking at more serious problems, the tzr`s tend to need a full rebuild after about 35-45000 miles
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It`s all powerfull white mans magic
https://i897.photobucket.com/albums/ac178/tzrsteve/album%201/035.jpg

[Billing]

I'll check the lines, and I'll (for the 9th time ) strip and clean the carb out.

It was fully rebuilt about 1000 miles ago, I know the bloke who did it. I then replaced the cylinder gasket less than 30 miles ago. I'll also change the gearbox oil and see if it clears the oil up
____________________
'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[Billing]

Can the head gasket be used more than once? I know it's not the best idea in the world, but if it's possible it'll save me a couple of quid.

I ask because if I take the head off to look at the bore to see if it's scored and if it looks bad I'm considering finally putting my powervalve system on it. I have a spare barrel with piston, moving powervalve, I also have in a box the bushes and the servo, big black control box and the cables and pulley assembly. So if it needs a rebore I'll use that barrel.
____________________
'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[Vincent]

[Billing]

[Billing]

I took the plug out today, it was black and oily, but that could be because I'd just had it running for 30 seconds :S

I put my thumb over the spark plug hole and tried to kick the engine over, my thumb was pushed off with a 'pop' noise, so I'm assuming the compression is ok?

I'm going to Bury on wednesday to take my mod 1, so can stop in at Ekquires to get some gear oil and change whats in the bike now (I did change it when I got it by the way)
____________________
'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[Billing]

Right, tookthe plug out today after trying to start it, it reeks of petrol. I cleaned it up a bit (with a lighter because I didn't have a spare plug to hand) put it back in, and it fired up for about 10 seconds, then backfired and cut out.

Could it be running too rich and fouling plugs and killing them? I'm getting a new plug tomorrow, might try an Iridium as its about £2 more and it *supposedly* doesn't foul as easily as a regular one (copper core?)

The gearbox oil has taken over an hour to drain out, its almost pure white, and very thick. Could the waterpump seal have failed, causing the gooey mess, but not enough that a noticable amount of coolant is being lost?

Again, any help in getting this running is much appreciated
____________________
'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[Dr. DaveJPS]

[Billing]

on the TZR its got a little shaft on the side that you pull out, it makes a little click and stays out (choke on) i know this because it was easier to start with the shaft out, but ran like shit until the shaft was in

I'm in the middle of tidying the house so will do the gearbox oil and a new plug as soon as im done. I'm also going to whip the filter out, from memory its got a twin layer DIY filter, so I'm wondering whether the density of that is altering the fuel air mix, because its too thick. if it seems to run better without a filter I'll get a proper Yammy one
____________________
'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[Billing]

Hi, Does anyone have a picture of a TZR125 powervalve setup? I can't figure out where things plug in

I've plugged the control box into the loom via the Black+Brown connector and Black/White (possibly yellow) bullet connector.

trouble is i have no idea where to plug the servo into or the other 5 wires on the control box.

Any help appreciated
____________________
'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[Kickstart]

Hi

Just uploading a photo of the wiring diagram for a TZR125 2RH.

https://www.alfa-pages.co.uk/TempPicture/TZR125Wiring.jpg

On those the control unit is under the seat on the r/h side, on the side of the subframe, just back from the footrest hanger. The servo unit is on the inside of the main frame on the right, just above the barrel.

All the best

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

[Billing]

[Kickstart]

Hi

Might well be a battery on its last legs. Even my 250 isn't enthusiastic about cycling the power valve when you turn the ignition on if it has been sat for a few weeks.

All the best

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

[ms51ves3]

My PV will cycle with just a battery charger connected.

[Billing]

It's a fairly new battery, I just haven't run the engine for long enough to charge it, I'll try borrowing a charger and hooking it up to that to check it's all good I'm busy stripping the carb down and giving it a proper thorough clean to see if, when combined with a new spark plug, it helps with the running problem
____________________
'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!