nr's blog

Half-term Report 24 October, 2015

Filed under: Motorcycling — nr @ 10:18 am
Where do I put the pedals?

Where do I put the pedals?

Time flies, so they say. And on the TZR project, well, things have been progressing reasonably well so far. What started off as a bootload of smeggy bits last week has, largely, been cleaned, checked over, cleaned again, sworn at, cleaned for a third time and finally, bolted back together. Not all of this process has been as much fun as it sounds. Take the carbs for instance. Not only were most of the horrible little screws that hold on the floatbowl seized, but most of the bits inside the floatbowls were also pretty rancid. Not to worry – a whizz through the sonic tank to clean up the jets, and then replace the screws with allen bolts, and they’re looking good. No idea whether they’ll work, but they’ve certainly got more chance now than they had before. The forks were in a similar state of disrepair; one of them having a dribble of sludge where I’d expect about half a litre of oil. This was an easy job though, mainly because the seals don’t need replacing. Well, they probably do, but I’m not going to as they’re not leaking currently, so I’ll leave that lovely job for the next victim to get their hands on them. The swingarm and suspension linkages were cleaned up, re-greased, and put back together. This sentence covers about 12 hours of the muckiest work I’ve done in years, but it’s satisfying to see the dull gleam of alloy where previously there was a 12mm thick layer of ancient chain lube. The wheels have just had a cursory clean up so far. I need to finish the job there. Which brings us to the picture you see here. Things are going back together now, and currently on the bench is the brake caliper. More on which later no doubt. All I’ll say for now is that it’s going to be a lot more effective once I’m finished with it.

Which brings us to the engine. Well, it’s a bit of a parsons egg really. I whipped the head and barrels off, and ordered new pistons, rings, small ends and head and base gaskets. Plan A was to just rebuild the top end, but a quick look at the 200ml of old gearbox oil in the bottom of the crankcase soon killed that idea. The crank seals have gone, and I don’t have the necessary flywheel pullers and wotnot to replace them. So, a quick call to the marvellous chaps at Cambridge Motorcycles revealed that they’d be happy to take the job on, and the bottom end was dropped off with them earlier in the week. While I had the barrels off, I thought I’d take a look at the powervalves. Which, surprisingly given the state of the rest of the engine, are looking OK. Well, once I’d scraped off 20 years of cack they’re looking OK. While I’ve got them out I’ll replace the O-rings, as they’re cheap, and it’s a head-off job to do them, so I may as well while I’m here. The rest of the top end has had a really good clean-up, and the barrels look good, so nothing else to do there now until I get everything back and I can put the new pistons and stuff in there.

And that’s where we are so far. Biggest expense by far was the top end rebuild kit – about £150 for the pistons, rings, gaskets and small ends. Other than that, a few quid here and there for seals and O-rings, and the normal consumables – it all mounts up though. I don’t know what the bill for the bottom end will be, but one of the joys of rebuilding someone else’s bike is that I don’t really care either, as I won’t be paying it! Plenty still to do – as well as the engine going back in, the electrics are looking like being a bit of a challenge. The loom has been butchered in a few places, and I think there’s going to be some fairly intense use of four-lettered words while I try to sort it out. And then the bodywork will need a good seeing to. So still a good few weeks work ahead, but it’s safe to say at this point that that the bike has just been brought back from the edge of the abyss – it was perilously close to the Great Breakers Yard in the Sky.


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