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Centre stand, rubber mallet, full English & lots of sweet coffee. Beat the bejesus out of the tyre, but just skim the tread with a slicing motion in the midline, assuming bike in gear. The repeated shocks through the driveline may break the clutch’s grip. Might stretch your chain too, so check chain slack after. Can tow bike in gear to same effect, but little shocks from mallet may act like a rattle impact wrench when loosening stubborn wheel nuts. Good luck!
Belated reply, but I found this guy (SofCHJanek)in Poland via his YouTube videos. Bought his system via google translate, money transfer (£40!). Dead easy to fit. Bike used more or less daily for last 8 years since fitting. Only grumpy if battery low. Regular use/charging keeps it all ticking over.
Someone was importing them & charging a healthy mark up, but google translate worked for me.
Cheers, MattThanks Derek. Its so easy to get confused over the terminology. In the Mikuni case I think I’m right in saying it is a fuel metering screw. So when it is screwed right in it should shut the fuel off which is now the case but it keeps running so is getting fuel by another route right. The carb came with spare, different sized spare jets. Time to try one. Bigger or smaller. Will be a pure guess on my part. My old brain can’t handle the logic approach.
I vill be back !Foresure – Let us know. Almost in the same boat myself. As mentioned fitted a new Mikuni to my Sup5. It does start – eventually (I was hoping for first kick) and as you say the plug never gets wet. I have even tilted the carb over to favour the level in the enrichment chamber, might have helped a bit. Now a a questo of my own, tinkering with the air/fuel screw yesterday afternoon. It was set about 1-1/2 turns out, I found that it started running smoother and happier with it screwed home, right in !!! What does that mean oh wise ones. Remember its a Mikuni.
Done all that Darren and more. You have my sympathies. Even fitted a new Mikunu. It fired up third kick – Hurrah but not since, not never.
Tell me does your plug ever get wetted with petrol, mine is always bone dry.Thanks Peter, good to get the feedback.
A piece of detective work and as you say, something to pass the current
excess of time.
Regards Rob.As stated earlier I had a similar prob with my cb77 twin. All fine till it got into the higher rev range, particularly on the motorway. Like you, I was convinced it was the mixture. Played with the jetting for about a year even though I had bought new coils just in case. Wanted to keep it standard like but when I did remove the coils I found the problem side had leaked its oil into an almost solid goo. Sorted !
So try another coil, not expensive.Thanks, all interesting stuff guys. Did look to lower my footrests but gave up, so how did you arrange yours Peter.
Have been having great probs with motivation but the article on the 502 really perked me up. Really good piece specially at the end when the cockups are admitted. I make plenty. 🙂Thank you guys for your replies , having asked around the trade I am going with the center of the pin. My problem is that not all suppliers quote the crown height and the ones that do don’t say where they take the measurement from. Some will just ask
what machine is it for, In my case this is no good as I am looking for a pair of pistons to fit an Adler MB250 twin that I am rebuilding, It will have Kawasaki KX125 motocross conn rods. All good fun While in lockdown.
Regard JohnHi, well the Mikuni is fitted (yesterday) And she fired up on the ninth kick which to me was incredible. Fitted but not sorted out the intake hose yet so seems a bit weak low down but of course as said it came with spare jets so can change if necessary. Did a slight miss service to Motocarb, the price actually was £165.00 + del. Do like the feel of it. For your interest the enrichment chamber is at the engine end of the body so must make it more responsive.
Skimmed a few thou. of each end dia. (see pic) to give a good fit in the manifold.
Still have to sort out the inlet hose. Would you believe it had split just sitting there. Twas only eight month old. Old stock do you think ? Trying Supaglue, well they are over thirty quid now. Did half try your suggestion of paring the hose out to suit the flange dia Ian but wasn’t happy with the way it was going. Still pondering on’t.
Below should be a pic of it in the lathe. Used a boring tool so as to miss the choke lever.
Hasta la Vista Amigos.
Ithangyou Ian, like the idea of paring out the air filter hose to fit if unable to get a reducing collar in there. Hoping to get the carb up in the lathe to skim down to suit the manifold. A bit too much to take of by hand unless you are really desperate.
As for jets the carb came with two spare main & ditto pilot jets as part of the deal, for fine tuning.
Looking forward to give it a go. Regards.Hi Skorpy, glad your still here.
Yes to all you say, will be interesting if you do go ahead to hear your experiences. We don’t seem to have a Mikuni website in the UK. Motocarb imports them from the U.S.
Now look at the time of this message.
Never assume anything. I just woke up and the first thought that came into my head was that I hadn’t actually checked the sizes of the Mikuni. I mean they couldn’t possible be the same could they. Well I have just checked and amazingly they virtually are. The overall length is shorter by 6mm – good. The inlet dia is somewhat larger and will need a reducing collar to fit the filter hose and the outlet dia. is about ten thou bigger so will be able to use the existing inlet manifold, once bored out to match.
Interestingly the main obvious difference in the two carbs is the fuel enrichment chamber is at the engine end of the body so I’m hoping it will be more reactive.
Time for a cup of tea.
Goodnight folks.
