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TZ250 1RK


Tony B
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Friend of mine dropped this off today.

He's asked me to re-commission it for him to use at the Cadwell PS/PB day in Sept.

It's beautiful little thing and pretty much 100% original. There are no battle scars and be honest, I don't think it'sever been raced. Though there is some comedy lockwiring.

First job is to put fresh fuel in and start it. Then the usual.

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Did a bit over the weekend.

Drained the tank and found a lot of this. Starting it will have to wait.

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Loads more still inside the tank. I think it's from a piece of baffle foam that's disintegrated. I gave it a good wash out with hot water.

Under the tank, the fasterners are all unmarked.

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Inside the left hand carb.

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After a squirt of carb cleaner and a stiff brush. Left with some staining.

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The right one wasn't as bad. Maybe as it's further from the fuel tap.

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MJs are 470., one size down from out of the crate.

The condition of this machine is amazing for a 33 year old race bike, I can only assume it's been sat in a warehouse in Japan for a while.

I'll connect a battery tomorrow and start it. I know some will say a complete strip first, but we'll see.

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Refitted the carbs and pulled the plugs and pipes.

Piston crown looks new, no real signs of blow by.

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Fitted a aux. fuel tank and connected the drill started. It span over but would not catch and had the occasion weak backfire. Balls. I'm thinking crank seals, twisted crank and other expensive sounding stuff.

Checked the obvious, but still no joy.

Shut the garage and went in search of a manual. Couldn't find anything on line. While looking I thought it could be the plug leads connected to the wrong sides. Checked and they could only really go one way.

I stated looking though project/for sale archives for an under tank picture. All I could find was a YouTube time lapse assembly video. Got a brief glimpse of the coil inputs. Orange to the top, checked the pictures I took and this one is the other way around.

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Back in the garage and swapped them over, tried again with no joy. Then  I realised I'd left the carb caps on! :facepalm:

Whipped them off and it fired straight away. 😀

I'll post a video tomorrow.

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Carbs off again today to check, they look grand.

Then I had it running. the R/H cylinder is not right and the bike filled the garage with acrid smoke.

It's been under a sheet since he bought it unseen last year (with no history).

I now have a manual, so the bike and motor will be coming apart for a clean and new parts as needed. No paint, apart from both master cylinders.

With a trip to the IoM coming up, it's doubtful it will see Cadwell. He's got a 4TW ready to go, so that will be there.

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On 8/6/2019 at 4:08 PM, Tony B said:

Refitted the carbs and pulled the plugs and pipes.

Piston crown looks new, no real signs of blow by.

20190805_123102.jpg.7bff53b248709adf14c8f1d631ba97d4.jpg20190805_130631.jpg.fe503450ae66becfb861c59c001e7f17.jpg

Fitted a aux. fuel tank and connected the drill started. It span over but would not catch and had the occasion weak backfire. Balls. I'm thinking crank seals, twisted crank and other expensive sounding stuff.

Checked the obvious, but still no joy.

Shut the garage and went in search of a manual. Couldn't find anything on line. While looking I thought it could be the plug leads connected to the wrong sides. Checked and they could only really go one way.

I stated looking though project/for sale archives for an under tank picture. All I could find was a YouTube time lapse assembly video. Got a brief glimpse of the coil inputs. Orange to the top, checked the pictures I took and this one is the other way around.

Coil.jpg.6c19d3ecd851914486d9a53014e6677a.jpg

20190804_133647.jpg.d99c90f437b160b3895f895c60e0d1b7.jpg

Back in the garage and swapped them over, tried again with no joy. Then  I realised I'd left the carb caps on! :facepalm:

Whipped them off and it fired straight away. 😀

I'll post a video tomorrow.

I did that last week

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14 hours ago, kit-parts said:

Stupid question but i'm guessing  you are using the right fuel and pre-mix?

Fuel is Esso 97 (I know the book says leaded, but it's the best I can get locally for a quick run up) mixed with Elf HTX 976.

Symptoms are as if someone has left a rag in the R/H exhaust.

I haven't got enough time now. My TZR has had a Zeel fitted and that needs a run on the dyno.

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3 minutes ago, kit-parts said:

All the TZ's that have been through my mitts have been 100%  Avgas pre-mix. I've never attempted to try unleaded.

My logic is that it's one less thing to question when chasing an issue that's undiagnosed dude. 

Be something and nothing i'm sure

Thanks, appreciate the input and I understand your thoughts. :thumbsup:

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On 8/9/2019 at 1:25 PM, ricey3 said:

swap the coils over, see if the issue moves over. Coils and looms often break down. 

Cheers, I've tried that. There's no change.

It's going back into storage till October, then it's a complete rebuild.

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  • 4 months later...
20 hours ago, 2Smoke said:

Missed this one. How's it going? 

Was tempted by one a while back, kinda like the race version of the 2ma tzr. Pretty things.. 

Bit of a story with this (some of it's in the PSB Cadwell thread).

It really is an unmolested jewel of a bike. I want it.

From what we can gather it sat in Japan for a few years and then Eddie Roberts had it. My friend then bought it and threw a sheet over it for eight months.

He asked me to re-commission it. I cleaned the carbs, put fresh fuel in and used the starter tool to run it up. It started and ran fine, I got it up to temp and all was grand. Day after it ran as though it was on one and a half and the tacho wasn't working (should have been a clue).

Anyway, we were both booked in for Cadwell and it was due, so I said I hadn't time to do any more.  I'd fitted a Zeel to my 3XV and wanted to get it on the dyno.  He has a 4TW, so recommended he took that instead and after Cadwell I'd take it back to a frame and rebuild it.

The owner then took it to Graeme Mitchell and asked him to replace the fluids, powder coat the wheels and fit new tyres (nothing more). The bike ran fine with him and I was sent a video.

We were hoping to take two bikes each, but the van wasn't big enough so we took these.

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All was well until noise testing was due and it wouldn't start using the crank tool. After some deliberation I asked how Graeme started it and he used rollers. Fuck it,  we'll do it the old way and push. It fired up immediately. Off to noise testing and it made 105.

It was so cold that night, I was wide awake and it dawned of me. :facepalm: The crank rotates clockwise the same as my 3MA. As you know the v-twins are anti-clockwise, which is what the tool was for..

After all this, it did two laps of Cadwell and the clutch started to slip. He pulled in and there was oil over the rear wheel. The pushrod oil seals had shit themselves. They've been replaced, but I'd still rebuild it.

There were some lessons learnt. Then on Sunday morning the van's battery was flat!

Otherwise, all was fine. 😀

Edited by Tony B
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Ah yes. The reverse tz is the same. Runs backwards. Bet the little thing will handle well then! 

Sounds like it just needs a thorough going through, little peaches to work on and ride :)

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