Cold front cylinder

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Cold front cylinder

Postby benshannon » 21 Nov 2020 13:09

So, a couple of times now the rev counter stops working and I lose alot of power. I can just about limp home. Some times I find the rev counter works but the front cylinder is mostly cold with a little bit of warmth at random intervals. The rear is always warm.

I switched transducers over but the fault didn't move over. I switched plugs over, still the same. (I have ordered new plugs to try)

Carbs are clean, it isn't a fueling issue.

So, I'm thinking it could be pick up.

So, how do I test the pick up to rule that out?
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Re: Cold front cylinder

Postby Ming » 21 Nov 2020 14:12

Is that an electronic or mechanical rev counter?
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Re: Cold front cylinder

Postby benshannon » 21 Nov 2020 14:18

Electronic mate.
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Re: Cold front cylinder

Postby Ming » 21 Nov 2020 17:05

I have known the tacho 'die' if the battery loses charge, but I don't see how that could affect the ignition. Paul Compton and Soren Hansen have clips on You tube which show how to test the various components in the ignition system.
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Re: Cold front cylinder

Postby stradella » 21 Nov 2020 18:57

A long time ago my 500 started to run on one cylinder only. There was a very fine crack in the black resin material in the pick-up - which must have broken an embedded component. If you have another pick-up (known to be good) you could fit it to see if that is the answer. Or you could remove the rotor to have a good look at the resin material. Even better might be to remove the pick-up and then you might be more able to see any crack/s in it.
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Re: Cold front cylinder

Postby MickeyMoto » 21 Nov 2020 20:25

As you know the transducers work, take out the plugs, stick them in the caps, lay them on the cylinder heads and kick or use the electric start. You should have a spark on the rear plug only. Swap the red wires on the transducers and repeat the exercise. Does the other plug spark?

Does this sound right?
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Re: Cold front cylinder

Postby mbmm350s » 22 Nov 2020 12:04

@Mickey moto. Spot on.
Often the pickup works when cold. Next to try with a heat gun gently or when it has failed out on the road.
As another poster says look for tiny crack in the resin use talc to make it visible. Pickups can be repaired ask George Lane on Facebook page. Alternatively there are reproduction parts from Nuovaray in Italy or Marcus Hellig in Germany. The ultimate solution is to replace everything with the digital sachse system but this is much more expensive.
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Re: Cold front cylinder

Postby Bruce3500 » 22 Nov 2020 13:50

I had this years ago with my sport, front cylinder dropping in and out, found to be faulty pick up, fitted new one and fault was cured, if i remember there is a test proceedure in manual, hope this of use
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Re: Cold front cylinder

Postby Kamel » 22 Nov 2020 16:56

mbmm350s wrote:@Mickey moto. Spot on.
Often the pickup works when cold. Next to try with a heat gun gently or when it has failed out on the road.
As another poster says look for tiny crack in the resin use talc to make it visible. Pickups can be repaired ask George Lane on Facebook page. Alternatively there are reproduction parts from Nuovaray in Italy or Marcus Hellig in Germany. The ultimate solution is to replace everything with the digital sachse system but this is much more expensive.
Mark.


Mark, if you join the Sachse "group buy" I've arranged you will get a 10% discount as we already have 5 confirmed buyers. If we can get up to 10 or more there will be another 5% knocked off. And don't forget you should be able to sell on any good parts to soften the blow.

viewtopic.php?f=4&t=6323

Cheers,

Kamel.
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