grizzlydan

You'll find that 1 & 4 are on the same coil so check all the connectors to that coil, then check the sparks with plug caps removed (sparks should be nice & blue). If the sparks are ok replace caps & plugs. If not then check the coil resistence in the ohms range, primary coil (between the 2 power in connections) 2.43 to 2.97 ohms & secondary coil (between the 2 HT leads) 1.8 to 2.2 ohms. If the readings are outside these ohms then you know that coil needs replacing.

Have you checked the plugs & caps, if they're knackered they start shorting out when warm. Also check all ignition connections for tightness & build up of verdigris (green powdery crap between the connections). You say there is no spark, how are you checking & if you do get a spark what colour is it? All these things need to looked at b4 you start spending major money on problems. I was lucky with mine when it started giving ignition & other electrical problems coz i'd just wrote off a XJ600 & replaced everything as all the electrics interfit. Don't know if you have one but I'd advise you to get a service manual. If only for the specs.

Junker. The same side as the oil filler but under the the clutch housing you'll find a sight glass with 2 notches on it (1 either side of the glass on the casing). With the bike in a upright position the oil level should be no higher than those notches, if the sight glass is full then you have 2 much oil in the bike. You shouldn't have more than 2.8litres of oil in this bike, if too much you risk blowing the oil seals when put under stress (luckily the oil is finding a different route out rather than through the seals).

What you want is a decent middle weight (400/600cc), something thats comfortable not race rep. The race style is great for blatting about a couple of times a week with ya pals but when it come to commuting you want comfort! As a ex-courier trust me when i say that when your doing kin loads of miles per day you want a bike that you don't mind riding day in, day out 24/7. Race style however will hurt, sore back, sore wrists, sore shoulders & sore pockets at the end of the week (ya just can't resist the throttle). Get some thing that sits you in a basic upright position (XJ series are good), 4 stroke for reliability (may be boring but it gets there) & also learn a bit about mechanics coz at some point you will need to do a bit of roadside maintenance. Ok i've now got a FZ600 which is race styled but then the furthest i been on it is southampton & blow me my wrists hurt for a good few days afterwards, then again when i had my XJ 600 i went every where, cornwall, scotland, up the north coast of England & eire. Now that was a comfortable bike just a shame i wrote it off in London.

have you cleaned out the carbs, no idle is usually blocked jets.

ooops, forgot about that one. lol.

I have a 1986 model with cone filters & being in England with less emision laws you can take the hoses off & put blanking plugs on the manifolds, just using the vacuum pipes for balancing the carbs. If anything you might find the bike performs better. You need to check the emision laws in whatever state you are in to find out if these pipes need to be connected to anything (instead of the airbox).

Doctor Dave. Doctor Dave had slept with one of his patients and felt guilty all day long No matter how much he tried to forget about it, he couldn't. The guilt and sense of betrayal were overwhelming. But every now and then he'd hear an internal reassuring voice in his head that said: "Dave, don't worry about it. You aren't the first medical practitioner to sleep with one of their patients and you won't be the last.... And you're single. Just let it go." But invariably another voice in his head would bring him back to reality. Whispering...... Dave!!!!!!!! Dave!!!!!!!! Dave!!!!!!!! ....YOU'RE A VET DAVE!!!!!!!!!!!!!!

makes me itch just thinking about it!

Looks to me as if you're connecting the petrol pipe where the throttle cable goes & the vacuum pipe to the petrol inlet. you sure there isn't a little copper coloured pipe sticking out of the inlet manifold? The green oil you saw in the carb should be 2stroke oil.

have you checked the engine timing & the cdi pick-up coils. sounds to me like ignition problems.

The answer is in the replies. It's there to allow the engine to accellerate. If there wasn't auto-advance the engine wouldn't go faster than idle (well not with out a fight & other problems).

Hopefully i get this right! What you're calling the carb boot, we in England are used to calling the inlet manifold. This considered, have you checked the gasket between the 'carb boot' & the head? On some models it's a paper gasket, on others it's a rubber O ring gasket. sometimes it may be that simple. Alternatively check the 'boots' from the airbox are seating properly, even after tightening the jubilee clips around those 'boots' either side of the carb.

Not being funny but £15/£20 for a manual is a great investment when comes to saving an average of £30/£50 per hour on shop service/repair charges. At least most manuals tell you how to do most everything.

According to the manual i have there are 5 different styles to the yb100 (3 of which have different sized front forks). As billa65t said, measure your forks to work out which one. You need the outside diametre of the upper bit & the inside diametre of the lower bit. Then hopefully, if the place you use for parts is any good, you will get the right seal.

Having worked at a youth project that own a few of these bikes i suggest a new sparkplug to start with as they do go through them. otherwise clean out & adjust the carb.

Hi Rob It sould be easy enough. Look under the bike & where the centre stand attaches to the frame you should see either a thick bolt or a tubelar sleeve going through the eyes of the stand & frame. Just undo the nut holding it in place & knock it through to remove. You might have to remove the exhausts to get enough room to get the bolt (or sleeve) out. By the way don't forget to remove the stand return spring before removal

take it to a main dealer, they should be able to tell you if it's an 'upgrade' for that bike & if so should be able to order one if they don't have it in stock. It may be a replacement light belonging to a different model.

sounds like a choke problem, either you are starting & not turning the manual choke off or if fitted with a automatic choke it either needs adjusting or replacing.

I'm no expert but auto-advance is there to make the ignition system work at the same speed as the engine. If you want to know more there are plenty of manuals around that explains the system better than most people can. Try a manual relating to a really old car coz the diagram's tend to be easier to follow ( & read with eyesight like mine).

Don.t know if this helps but i had similar problems with my 1986 FZ600. Turned out the ignition was coming apart as the screws in the back of the ignition switch were working loose, a quick tighten & it solved the problem.

I've had this problem on a number of bikes & rather than replace, check the return spring is fitted in the lever. though if they're aftermarket the levers might not have them fitted but check anyway. the other way round it is adjust up the space.

according to the spec book i've got, 2 +half turns out & idle at 1200rpm. That's for English models but it might help.

That's GOOD! Would've said so sooner but I've only just stopped laughing.

A 7 year old & a 4 year old are upstairs in their bedroom. "You know what?" says the 7 year old, "I think it's about time we started swearing." The 4 year old nods his head in approval. The 7 year old says "When we go downstairs for breakfast I'm going to swear first, then you swear after me, ok?' "Ok' the 4 year old agrees with enthusiasm. The mother walks into the kitchen and asks the 7 year old what he wants for breakfast. "Oh sh*t mum, I s'pose I'll have some Coco Pops. WHACK!! He flew out of his chair, tumbled across the kitchen floor, got up, & ran upstairs crying his eyes out. She looked at the 4 year old & asked with a stern voice, "And what do YOU want for breakfast young man?". "I don't know," he blubbers, "but it won't be f*cking Coco Pops."