Tzr125 oppppsssssss

[furrycup]

Hi there guys

Im new here so just a big heello to start.

Ok heres my problem. im a total ass. i striped my bike down to get it sprayed. when i rebuilt it, the pipe leading from the 2 stroke tank wasnt fitted correctly. so last night i spent 3 hours waiting for the RAC to come pick me up. The engine siezed up........................

I eventuly got home and realised what had happened so i reconnected the pipe and topped up the oil. the bike is running now, if not sort of slugish.

ok heres the big question.. what damage could i have done and what should i be checking?

I am still only a begineer on bikes but dont have loads of cash to spend paying other people to sort it out for me. so any help at all will be very much apriciated.

[Biker Dude]

hey mate... cant help ya with the question. But if ur new, go put a post in HELLO section!

[Tark]

You may have scored your bore and piston. If it is a newer TZR then you might have a problem with the fact they have a nickle plated bore and you cant re-bore them and re-plating is costly.

On the other hand you may have damaged the piston but the bore not be too bad. Whatever happens you could leave it as it is and put up with it or you will have to get the top end stripped down and investigate the damage.

Sorry to hear it matey but I think we have a ll done it! :roll:

[furrycup]

thanks for the info i will get to striping it down tommorow and check out the damage. i will let you know how i get on.

[furrycup]

how do i know what size piston rings i will need?

[wowzer]

so u cained the piston rings! DOH!
sure u aint scratched the bore? (remember the slitest scratch can affect the performance!)
check for metal flakes inside the bore that may of been due to the grinding of the metal.(will look like little bits of glitter)

AND ALSO CHECK THAT U PUT THE 2T PIPE ON PROPERLY NEXT TIME! :D

[wowzer]

the size is gonna depend on the bore!

dunna wot bike ya got n wot size engine! ??????? :?:

[Spider]

i dont mean to laugh at your misfortune but i never mangaged to er seize up cause of no oil i managaed to blow my piston took a chunk out of the piston and bore and the piston rings were welded into the pistion

[furrycup]

how stupid of me. Its a tzr125 on an f plate. I dont know what damage i have done yet, but i do have a new piston already and was just wondering how i find out what rings i will need to fit it. is it just trial and error? would you sugest i get it rebored. how much will that cost and where can i get it done? im in birmingham.

look in the eb album i posted a piccy of me bike.

[Tark]

I would get a rebore and get it skimmed. Wont cost you much. Then fit a new piston, rings, and big and little end bearings. You should be able to get these from your local Yam dealer.

[furrycup]

ok i finaly got it stripped down. right heres the score, it looks like the bore is slightly scored, the piston is scored, unsure about the condition of the rings, i have a little play in the conrod so i take it the bearings are worn. the chap in the local bike shop said while its stripped down i may as well change the other 3 bearings ( what other bearings?) anyway he told me it will cost £225 including a rebore. do you think thats a reasonable price? also i was reading in another post here that tzrs cant be rebored........ is that just the late model?

[Tark]

I dont know about the earlier models but the late modles have a plated bore so cant be re-bored.

If yours is like that it will explain the hefty price off £200+

If the older model does not have nickle plated bore than you should tell him to shove that price up his ass, get it the cylinder reamed out 0.5mm and then buy a 0.5mm oversized piston with rings and a big and little end bearing.

the ream should cost you about £20 from a machine shop/bike shop and the piston and rings about £20 and the bearings £5 so you should be able to do it yourself for under £50

You could get the head skimmed while you are st it to increse compression a little and help seal the gaskets when you put it back on but its not essential.

[wowzer]

have a loook at ,UP BORES... in the 2 stroke section.

MOBY tells of a place that he know's of in france,it's got a 170cc bore kit for the TZR!
its 550 euro's i think, can anyone tell me how much that is in £££'S

and lower down the page he has a contact address good for all welding on engines,rebores ect,ect

[Tark]

550 EUR = 386.682 GBP

1 EUR = 0.703059 GBP
1 GBP = 1.42236 EUR

:wink:

[wowzer]

good man cheers for that but im not sure wot im gonna do about my bike now as my mate just offerd me a gixer400 on an F plate with a blown engine providing i sort out his other bike. all i gotta do is loads of polishing on his bike,sort out the wiring and repaint it for him n the other ones mine! pretty good ha! :D

[Tark]

well either way you will have a bike that doesn't run so there is work to do. It will cost you more to get the 400 running as there is 4 times the amount of pistons etc etc.

[wowzer]

i no its a bit of work as i will prob change the engine. (the conrod went through the block!) i may just look for the parts n just change em,not sure yet.
i no 3 of the fairing pannels need painting as there a little damaged,i no people that will sort that out for me.(the bike was only repainted at the start of the summer by my boss) the rest of the bike is all good brakes tyres, fork sills, good rolling chassis! :) its got a full race system n i get the stage 3 tunning kit that blew the engine in the first place cos he never had it set up properly! think that sounds any better now?

not sure wots gonna happen to my TZR though! this is my first bike i've ever had and it's the nuts lovely pait job n fully rebuilt and i'll miss it if it goes! but then again it will make someone else happy! (not sure if im gonna sell it,or keep it aswell) :?

[furrycup]

Ok i finaly got my bike back after the work, he rebored it and fitted new piston, conrod, bearings , seals and gaskets.

I have had it back for two days and broken down twice :( . first time i broke down i changed the sparkplug and it seemed ok. But when i left work today i rode about 500 meters then it started to spluter and stopped running. it wouldnt start after that.

i got home stripped the farings off and got to work looking for a solution. bear in mind i know very little about bikes.

I removed the plug again to check the spark it was sparking but not very brightly. it also looked like the wet fouled plug in the plug sticky thread.

i then took the plug and heated the end up with a flame to remove the wetness. i refitted the plug and tried starting it again. It started, if not only for a minute or two before it started to splutter again. now it looks like i will have to take it back to the shop to get it sorted out!

Any ideas what it could be and what i need to do to try and fix this problem to save me a jorney and inconvienance of not having my bike for a couple of days?

Thanks guys

[Tark]

Sounds like its getting too much petrol in or too much oil. Fouling up and not getting a strong enough spark to ignite.

Try checking your jet sizes to see what jets are in.

Have you had a Bigger Re-bore?

[furrycup]

yes it has been rebored to 1.5 oversize. How do i check the jet size? What size should they be.

[Tark]

I take it that means the piston is 1.5mm bigger in Diameter.

You will have to take your carb off and take the float chamber off of the bottom. Your main jet is what will be affected by your big bore. You should be able to unscrew the jet with a flat blade screwdriver. It should have the size of the Jet stamped into it.

I am not sure what the normal jet size is never mind what it should be when you have a big bore. Best bet is just to try different sizes and see what works best.

Hopefull somone on here that has a TZR with a big bore wil be able to tell you what Jet size they are running.

Or you could ask at your local dealer what it should be and then go up about 10% or so. Jets are only a few £ each if that so you could grab a couple and experiment.

The best way would be to get the bike on a dyno with gas analyser but this costs more!

When you get it running, get it warm and do a plug chop. This is when you fly donw the road flat out and then hit the kill switch. Pull the cluth in and come to a stop. Then take the plug out and see what condition it is. This is the best way to tell how your bike is running when warm and riden normally. Its no god doing a plug chop when its cold or idleing cos you will get a dirty plug anyway.

Hope this helps.

Mark.