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Post by rupertw on Jan 28, 2013 17:31:30 GMT
I recently acquired this Yamaha AG 100. I've not had it running yet, and the clutch arm attached to the worm gear has sheared off, so no clutch yet either. I think these are a fairly rare bike in the UK and its certainly making tracking down parts difficult! Does anyone know is the AG 100 engine is similar to any other Yamaha models? Plan at the moment is to simply get it running, and then I'll start to think about returning it to the roads. Pics:
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Post by dungbug on Jan 28, 2013 18:28:53 GMT
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Post by TerraRoot on Jan 28, 2013 20:23:16 GMT
Engine looks familiar to me, can't place it exactly, what parts exactly are you looking for? parts aren't a problem by the way, the ag100 is still built brand new in new zealand. heard bucket racers taking about how totally unsuitable they were for racing.
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Post by rupertw on Jan 28, 2013 22:45:47 GMT
The main part I'm after is the clutch worm drive/lever mechanism. Basically the engine end of the clutch cable pulls up on a lever attached to a worm gear, and the worm gear then pushes on a rod which goes against the clutch plates I think. The lever has sheared from the worm gear on mine. I'm going to try welding it, but it would be a lot simpler and more reliable to just replace it with a new one. I'm also not sure if it's supposed to have indicators or not. There are none fitted, but there is a marked place and slot on the light switch housing for an indicator switch, only the actual toggle bit is missing.
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Post by TerraRoot on Jan 29, 2013 8:15:47 GMT
try a scrappy for rxs100 bit's for the clutch, lots of the small yamahas have the same worm gear and push rod setup, don't miss out on the ball bearing that goes with the rod, it very easily missed. i see no reason why it wouldn't have indicators, again probably very generic period ones too.
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Post by rupertw on Feb 2, 2013 21:14:52 GMT
Thanks, I'll have a look at some rxs100 bits. I'm not sure what's going on with the indicators, I'm just hoping that the wiring has not been too messed around with.
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Post by rupertw on Mar 27, 2013 18:58:03 GMT
A bit of an update; I finally managed to track down the parts I needed for the clutch, at rather large expense. The clutch is now working, but is quite heavy, so I'm not entirely sure all is exactly how it should be, but it will do for now. I fitted a new battery and obviously everything is still totally dead, so I'm going to have to start going through the wiring. There is a spark, but its not as good as I would like, and may be why it is not starting. I'll get a new spark plug tomorrow, and I'll see if I can at least get it started.
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jonw
Retro Fitter
Posts: 145
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Post by jonw on Mar 28, 2013 7:51:46 GMT
ool bike. Might be worth slapping a new ht lead on there for good measure.
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Post by TerraRoot on Mar 28, 2013 8:15:35 GMT
coil could have cracked with age, you'll find the spark disappears when it gets a bit wet. got the basics? fuel/ is the plug wet? spark/ yep air/ air box isn't plugged? compression/ piston isn't scored?
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Post by rupertw on Mar 28, 2013 12:37:51 GMT
I've not checked the coil or the air box yet. The plug is getting wet so I'm presuming plenty of fuel is getting through, and there is plenty of compression. I'll try a new sparking plug first and check the airbox, and if that doesn't help I'll start fiddling with the coil and so on.
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Post by rupertw on Mar 28, 2013 14:54:51 GMT
I cleared the airbox out - it was full of rubbish, but I don't think that was stopping it from starting. I've had a look at the wiring, and its been slightly messed around with because the indicators have been removed for some reason. The spark still isn't great, but I would have thought that it would be good enough for it to run. I'll maybe try to find a new coil, but it's a nightmare trying to find any bits for this bike, so it might take some time.
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Post by rupertw on Mar 28, 2013 15:54:15 GMT
It runs!!! I cleaned up some connections and put some fuel on the plug and it decided to work. I've still got the air filter off as it was filthy and so I washed it and its still drying. I won't use it again till I've put it back on. It goes very well, although its a bit cold at the moment for motorcycling. I'm undecided about the MOT, but I'll see how I get on with it around the farm and then make a decision.
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Post by TerraRoot on Mar 28, 2013 16:37:56 GMT
the business, go get a couple of jackets on and take it for a spin around the yard! i spent today in the land rover with two t-shirts a fleece an inner jacket and my motorcycle jacket over the lot, toasty.
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Post by dungbug on Mar 29, 2013 10:14:27 GMT
Result, definately get a couple of jackets on & go play........All in the name of 'testing the repairs' of course. ;-)
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Post by rupertw on Mar 29, 2013 15:22:29 GMT
I've been riding about a bit more on it.It goes well, although it certainly isn't fast. The gears take a bit of getting used to as neutral is at the bottom, apparently to make it easier to select in wellies. The brakes seem amazing, although I'm not sure if that's just because they didn't really work on my last bike. There seems to be a slight fuel leak, possibly from the crankcase, but its not too bad. As for an MOT, off the top my head it would need brake/rear light fixing, numberplates, horn, and possibly mirrors. Not a very long list, but I can see the electrics being a problem. I'm slightly temped to MOT it and sell it on, as I want a bike I can use, and with spares being so difficult/expensive to find, I'm just worried about something breaking. I'm very happy with it for now anyway!
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