Hairsy

WeBike Japan looks to be very cheap - £25 incl. postage for 4 jets. Seems to claim they're OEM. Has anyone used them - are these likely to be genuine OEM parts?

I'm going to be rebuilding a set of CBR600F carbs. I plan to clean parts where possible but I've been advised that it's wise to replace the pilot jets rather than try to clean them. There's lots of cheap rebuild kits on eBay etc but I want quality. I don't want to do the job twice. Can anyone suggest a source of reliably high quality jets? In the absence of a reliable alternative, I'll go OEM Honda but they're going to set me back £80+ for the 4 jets. So if there's an quality alternative then that would be nice!

It's been a while since I gave an update, mostly because other things have been getting in the way and it can be hard to re-engage once momentum has stopped. But today I finally got around to getting the MoT done. One advisory for slight play in a front wheel bearing but not of concern. However, as a result of the ride to the MoT place and back I've realised that I'm not happy with how smoothly the bike runs at low speed. Dirty pilot jets are definitely the main suspect. Those who've been following this thread may recall that I replaced the carbs with a second hand set from a recently running bike. I contemplated doing a full clean and rebuild when the replacement carbs arrived but I was so desperate to know whether the bike would run at all that I fitted them with only a minor clean of the bowls. The bike does run OK now, and there's probably bikes out there that run worse, but I can't consider the bike finished with this rough slow running. The MoT place were very complimentary about the bike and that just gave me even more incentive to get her running right. So next week I plan to, once again, strip away the bodywork and pull the carbs off. They'll then get a proper comprehensive clean, rebuild and then balance which, I hope, will leave the bike just how she should be. A few more updates coming soon.

Similar to the above ... I would start with alcohol, rubbing the area with a little children's paint brush if it's fiddly (I buy packs of 5 from Poundland!). If that doesn't work then I'd step up to White Spirit and / or Paraffin. With either of these though, I'd then follow up with alcohol or brake cleaner. Nail polish remover (acetone) can be good but, as mentioned above, I would worry about its effect on plastics so I'd be more cautious with that.

Very kind of you to say so and if it gives you that boost then that’s fantastic. I certainly got a boost from reading other threads on here. And I’ll keep an eye out for you when your work is finished - we live in the same town!

I’m certainly contemplating keeping it, yes, even though logic says I shouldn’t. I’m certainly not in any rush to advertise. The reality is that I have a bit of a yearning for something that I can do a bit of touring on - specifically VFR800 or Sprint ST1050. In which case, both my CBRs will have to go to fund the replacement. We’ll see. The experience of taking a rusty non runner and making it in something that I can feel good about has been a great one. So, whatever happens, it’s all been positive. I’ll update the thread with whatever ends up happening with the bike.

So last job will be to take the bike through an MoT but I'm not in a great rush to do that because I suspect that people will start looking for bikes once the nice weather starts. No real benefit in having a quick MoT and then spending 2 months waiting for a buyer. I suspect I'll look to MoT and sell after Easter. The key question will be how much to sell for? The bike has done 40,000 miles (the odometer reads in km) which isn't unreasonable for the age but I don't have the service history so that's got to factor into the price. The plus side of course is that this thread will hopefully serve as a helpful accurate record of what's been checked out and/or sorted out. The price for rideable bikes seems to range from £1,000 to £2,000 (although I've seen one recent optimist looking for £3,500!). We'll see. If anyone happens to be interested in buying the bike then please feel free to DM me. And of course there remains the possibility of falling in love with the bike when I take her for the MoT!

Everything is now back together and even had a brief moment of dry weather for some pictures. And a few before and after of key areas of corrosion ... Feels nice to be done!

Very brief update - the second hand tacho arrived - and it works! Instruments are now back in place, along with most of the fairings. Photos to follow when its complete and there's a break in the rain so I can get it outside. Happy boy.

Just some polishing and waxing of body panels today. Photos don't really show the benefit so I'll save that for when the bike's back together. Waiting for the replacement tacho to arrive now - and praying that it will work.

The tougher days seem to often be followed by a better day. After my update yesterday, I did some searching and found a second hand tacho on eBay. I got in touch with the seller who had bought the tacho second hand himself to replace an intermittent one on his back. In the end he didn't swap it. Sounds very like my situation but he's never actually tested it. The great news is that he's happy for me to return it if it doesn't work. So that's ordered and will hopefully arrive later this week. This morning I worked on the mirrors. They came off the bike with plenty of evidence of past abuse. Definitely seen better days. I've never tried to repair this sort of damage before but new mirrors are outside budget. Following some research I started by attacking them with some 120 grit sandpaper over the whole thing. After 15 minutes or so they were looking very dull but a lot of the scratching had gone. Those remaining scratches did then need a lot of elbow grease to take the plastic down to the level of the scratches. Each mirror got about 30 minutes of sanding but they ended up looking OK but obviously very dull. I then moved on to smoothing out the surface, initially with 400 grit wet & dry and then finally with 800. They still looked pretty awful but the final step was to melt the surface with my heat gun set to high. After a couple of tests I found the best technique was to get the whole mirror as hot as possible and then hold the heat gun very close to melt the surface and move systematically over the whole mirror. It needed care and patience but once I had the hang of it, it felt a bit like spray painting with hot air. They took some time to cool and I'm really pleased with the outcome. I'd definitely recommend this. It just takes patience and having the faith that, as you make it look worse, it will come good in the end. Before and after ...

And was your problem sorted?

Welcome and looking forward to seeing how your restoration develops. I like small bikes. Re the advice about pipes, post pictures showing both ends of them!

Thanks for that info. Unfortunately the motor is connected directly to the PCB and has a load of plastic housing around it so I just can't see. To be honest, I doubt it's brushed as it must need a significant level of precision and I'm not sure a brushed motor has that. But I don't actually know I went to see my tool supplier friend and he didn't have anything that would give me a peak reading - and most of his stock was out on the van doing the rounds. However, as I've been able to see that the output from the ICM is consistent whether or not the tacho happens to be working at that time, I'm pretty confident that the problem is the tacho. With that in mind, I'm going to try to get hold of a replacement second hand tacho at a good price. If it turns out to be expensive then I may wait and see whether the current one becomes less intermittent life after some usage - but I'd be happier if I could replace it. And while I'm waiting, I'm now starting work on getting the fairings as good as they can be. They're used with some previous crack repairs but I think they're still going to look good - certainly not worth replacing. There's also a crack that hasn't yet been repaired so I'll need to sort that out.

I've gone over all that corrosion and sorted it. There's good connectivity through those screws that provide the connection to the tacho underneath. I took it all apart again this morning and sprayed some contact cleaner into the coils of the motor that moves the needle. I connected the bare instruments to the bike. It started with some erroneous readings but after a short time it settled into working well. I left it for a few minutes and all was as it should be. In a good mood, I put the instruments back into their casing and fitted them. Started the bike again and ... no reading! After a while it kicked back into life but it's not quite right. So I'm fairly sure that it's the tacho itself. I've taken a voltage reading from the signal wire and it averages at around 1.3 at idle and increases with revs. While this type of reading doesn't give the precision I want, I'm fairly confident that this is OK. Those readings are the same whether the tacho happens to be working at that stage or not. I'm popping over to see a friend who is a tool supplier to the trade in a moment as he may have a proper peak voltage meter. That would allow me to have more confidence that the ICM is OK. Where there's mechanical movement, as is the case with the little motor that drives the needle, a bit more operation might allow the contact cleaner to do its job and bring it back to life. After all, the bike was left sitting for 3-4 years. I don't know whether the motor has brushes - if it does then there's even more likelihood that the combination of a bit of use and the contact cleaner will sort it out. Alternatively, I bite the bullet and get replacement part(s). A full set of instruments will cost me over £100 and would mean a mileage change on the bike. I don't really like that as it will then call into the question the integrity of the mileage. That's already complicated by the fact that the mileage counts in km and one or two of the MoTs have incorrectly recorded the odometer as miles (the speedo face has been replaced to show mph). A better option would probably be just a second hand replacement tacho - it should be possible to find one so I think that's the option I'll pursue. I just get nervous about buying sensitive parts that someone else has hacked off a donor bike! The question is whether I do it now or try riding the bike for a while and see whether the contact cleaner on the moving parts does its job.