Author Topic: Advice on engine problem  (Read 1772 times)

Offline sprinta

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Re: Advice on engine problem
« Reply #15 on: July 07, 2017, 03:02:25 PM »
Primary resistance of coil both 4.8 ohms.

Swapped the HT leads of No's 2 and 3 over and did around 50 miles. The black sooty plug has now moved No 3, see photos, No 4 on left. So is that indicating that there is something wrong with that particular ht lead?

With No 2 now showing a more normal colour can I now rule out seal or piston/ring as being the cause?

Offline K2-K6

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Re: Advice on engine problem
« Reply #16 on: July 07, 2017, 03:50:56 PM »
Start it tonight in a real dark place and have a good look at that HT lead to see if it's tracking out to earth anywhere, it's one of the quickest ways to find a leak in HT systems. You may have to take the tank off to get a good view of the first parts of the leads.

Sounds like progress though as you've got it to move around and so giving you a direction.

Offline mike the bike

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Re: Advice on engine problem
« Reply #17 on: July 07, 2017, 05:56:57 PM »
A further test is to swap the leads back and just swap the HT caps.  This test will show whether it's the HT leads or the caps that's causing it.  Any excuse for a rideout.
"I'm just going for another test ride dear, see you later"
Where's that 10mm socket got to?

Offline sprinta

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Re: Advice on engine problem
« Reply #18 on: July 07, 2017, 10:23:23 PM »
Thanks for the replies and suggestions.

Will follow them up  and see what it brings.

Andy

Offline sprinta

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Re: Advice on engine problem
« Reply #19 on: October 09, 2017, 04:49:28 PM »
An update from my previous post.

As previously advise the bike is fitted with electronic ignition, so no points or condensers.

Fitted replacement pattern ignition coils.

The carbs have been ultrasonically cleaned and the needles dropped by going from fourth to third groove and the air screw initially approx 1 turn out.

All floats levels at 26mm. Pilots: #40 and mains: #110

Did around 50 mile run and removed plugs. No's 1 & 4 very lean and No's 2 & 3 OK?

No 1 air screw now around 1/2 turn out and still fairly light No 4 air screw around 1/4 turn out and still light?

No apparent leaks on any of the carb rubbers.

Confused!

So what to do?

1. They are OK leave alone?

2.  Go back to the 4th grove for No's 1 & 4?

3   Go up a size on the pilot jets for No's 1 and 4?

4.  Raise float levels on No's 1 & 4?

Offline K2-K6

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Re: Advice on engine problem
« Reply #20 on: October 09, 2017, 07:00:51 PM »
Two and three don't look bad at all.

I'd lift the needles on one and four so that they are richer, then run it again for similar distance to see what you've got.

It may not be correct to run differing needle heights but in the interim it would be safer to make sure those two aren't going too lean while you consider what else to do.

 

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