94 Tzr help

[Ady36]

Hi,

Bought a non runner couple of weeks ago, I have rebuilt the top end and managed to get it running. Bike has a lot of little bits missing. My question is about the carb, had it running today and noticed liquid leaking, turned out to be petrol. It was coming from a very small connector on the back of the carb. Looks like a pipe is ment o go on there but it would be a very small pipe in diameter. Obviously there is no pipe or cover/blank whatever there. Can I blank it off or do I need a small pipe ? and if I need a small pipe where would it connect to ?

any help appreciated.

[bayonet]

Hi,

Bought a non runner couple of weeks ago, I have rebuilt the top end and managed to get it running. Bike has a lot of little bits missing. My question is about the carb, had it running today and noticed liquid leaking, turned out to be petrol. It was coming from a very small connector on the back of the carb. Looks like a pipe is ment o go on there but it would be a very small pipe in diameter. Obviously there is no pipe or cover/blank whatever there. Can I blank it off or do I need a small pipe ? and if I need a small pipe where would it connect to ?

any help appreciated.Sounds like the drain. If it's the drain then it should have a little screw near it that you undo to empty the float bowl without removing it. Check that it's done up. Normally there would be a pipe on it, just to take the fuel past the chain and let it run straight on to the ground.

Also the same pipe may double as an overflow so if your float is set incorrectly the excess fuel can escape. This would happen even if the drain screw was closed. Check your float and needle is okay and not leaking.

[Ady36]

Thnx, I will take a look tomorrow and see if theres a screw near it. I know there is a threaded hole on the carb with no screw in it, maybe that is the screw you mentioned and maybe it is missing resulting in my fuel loss. There are so many clips, screws etc.. missing all over the place on the bike. It is running now but I just need to fix these little problems.

I also have one wire which I disconnected when I took the engine out which I cant remember where it went. Could do with some advice on that also. I will take some pictures tomorrow to show it.

again thnx for your reply, much appreciated.

[Tark]

if petrol is coming out of the drain pipe then you might have a stuck float of the cut off valve in the carb is stuck. Your not gonna like this but I would reccomend that you take the carb off and clean it all out. LOL. Sorry.

[Ady36]

Thnx Tark, I will do that tomorrow for peace of mind, do i just need to remove the bottom of the carb to achieve the desired result ?

[Tark]

when you take the carb bowl off you will find a float in there. What this does is the same as your toilet really. When the bowl is full the float lifts up and cuts of a valve that lets petrol into the carb. If the float is stuck or the valve stuck and the float not closing it the petrol will continue to flow even when the bowl is full and thats why its over flowing out of your carb.

Another way is to turn the petrol off a few seconds before you turn the engine off. then your bowl isn't full and you are not supplying it with more from the tank. This might be worth a try just to make sure its the float. Best bet is to strip it anyway and then you know its clean..

Is your bike a TZRR??

[Ady36]

Thnx Tark,

I stripped it today, the float was ok as were the jets which was good. There was a blockage in both the larger connections which have the pipes that lead off to the head. They were badly blocked and took a lot of cleaning out starting with a pin and then working up to a larger tool to clean them out. After that I blew through them and the air got through. I guess this must have been causing a backup and forcing the fuel through the drain pipe you mentioned.

Well I thought that was going to be it sorted but things turned worse ! After reassembling I tried to start the bike up but as It was turning over I noticed fuel dripping/spraying onto the floor. So I had the mrs turn it over while I watched to see where it was coming from. Could not see it exiting the carb anywhere, and it would have to have run down the block and dripped onto the exhaust but there was no sign of that. It seems the exhaust is knackered, the fuel is actually coming out of the exhaust itself !! It is like the exhaust is porous and it is blowing it through tiny holes in it, a bit like ringing a sponge out.

What are your thoughts on this ? Obviously I need a new exhaust, I have been searching online and struggling to find somewhere where I can buy one, everyone seems to just sell cans.

[Tark]

Downer.

Check this site for an Exhaust system:

http://www.stanstephens.com/exhausts.htm

[Ady36]

Thnx for the link, looks like it will cost me £105, ouch!! but I think buyung a new one will be safer then getting one off ebay, at least I know its gonna last. I paid £400 for the bike, spent about £85 up to now on a piston kit, gasket set and tranny oil. Looks like another £105 on an exhaust now. But overall that aint to bad I think. I am gonna need a fairing too so probably another £200 there but I have compressor and gun so can spray that myself at least. Gonna have to plod on with all of it and save some pennies for the bits.

I must say this a great forum, I am glad I found it, some top advice and infromation on here. I have learnt a lot of stuff that has helped me already.

One more question, Where the suspension/shock is mounted there are three holes at the bottom of it. It is currently fitted in the middle of the three. Is it safe to move it down to the lower hole and would that lower the bike a bit ? Bike will be for my mrs and its a little bit high for her as it is. My son has a 88 tzr 125 and she fits on that just fine but the 94 model has a taller seat height.

Oh Tark you asked me if it was a TZRR, well I am not sure. The docs just came back form dvla and it only describes it as a 1994 yamaha 125cc. How can I find out ? is there any markings/id numbers that can tell me. The guy I bought it off told me it was one of 500 imported, frame number 4HW000219, he said the last digits meant 219 out of the 500 batch.

[richard_ha]

Must admit I've not heard of the 4HW Frame, mines a 4DL (Italian import), there a 4FL Which i tihnk is and English version. Dunno about the 4HW

[Tark]

Does it look like this?:

http://www.tarkracing.com/images/other/tzr1.jpg

Thats my old one. TZR125R Uk Model. Think they only made 500 of them.

[Ady36]

Lovely bike that one, yep it is the same model, panels swingarm etc.. are all the same. Unfortunately on the one I have virtually all the plastics are ruined, they have been welded together and bodged up that many times theres nothing can be done for them. I will definately up some pictures of my project over the next couple of days.

[Tark]

You might be interested in the De-restricting topic then. Chances are it wont have been fully done ie. Wire cutting etc etc as well as the powervalve. Good luck with it all and look forward to seeing your progress.

[Ady36]

Yeah I had a good read of the destricting topic when I found the forum. I think whoever previous owners were have done a lot of that kind of thing on the bike. The Servo only whirrs twice when ignition is turned on, but I am going to go through the post you did and check all the steps to see if everything has been done properly. I am going to put the exhaust on from my sons 88 tzr (presuming it will fit but it looks the same) so I can do some more testing and tuning of the bike, as I said original exhaust is totally knackered so not much point in trying to set things up using it.

[Tark]

Not sure if the exhaust is the same. The Expansion box is slightly different but the easiest way to find out is try it.

[old diehard]

hi there, i have a italian tzr(4dl)model 1992. does any one know where i can buy parts for one [new engine bits etc.] also i was looking for a tzr 125r 4hw the offical uk version 1993 to1995 i think,any info would be great.

[Ady36]

The one I am working on is the 4HW 1994 model. Pretty hard to find bits for them unfortunately. Ususally stuff on ebay but you need to be lucky to find what your looking for.

Up to now I have replaced piston and rings, clutch plates, exhaust ( not same as original but is compatable and works and looks fine), Had to get all body plastics made up as old were damged beyond repair (cost £315) .

Basically I have the fork seals and chain and sprockets to change and then a good clean and fitting of plastics and it will be good to go. Will post some pics soon.

There are a couple of bike shops in my town and they are great for most parts, its just plastics and more exotic stuff that are hard to find at a good price.

[old diehard]

hi there, i had that model great bike!!!!!!!!
i have an 1992 italian import [4dl] i don't know if you know the bike basically an italian made yamaha. i need to find out where i can get the paets for a full engine rebuild. it looks like the old tzr engine [3pc] but the clutch andstuff is all italian made any suggestions??

[Ady36]

I dont know where your located, but your best bet is your local bikeshop. You shouldnt have any probs getting engine parts there. I rebuilt the engine on mine and they had no prob ordering piston and rings, full gasket set etc.. for me. The parts should be the same as other models, probably just a few differences on the bike. I know the swingarm on the italian model is different and probably the plastics, but engine parts should be same part numbers when ordering.

If I were you I would strip the engine down and remove the piston before you order one. Take it down your local bike shop and they will measure it before ordering one, just in case its been bored out. If you look on top of the piston when removed (youll need to scrub it clean) if it has a number 1 on it then it means the cylinder has been bored one size bigger. Definately strip it and take it with you for them to measure anyway.

Does the bike run ? and if so how does it sound, any rattles and suchlike ?

When you strip it you will be able see if the cylinder is ok or not, maybe you just need to change the rings.