Search found 28 matches

by UrbanPeasant
Fri Sep 20, 2019 2:47 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Bringing this thread to some sort of close: The last update was that I'd tried a different piston and cap on carb3 to no avail; still had a fouled plug. I've now had the time to completely clean and rebuild (Randakk) my GL1100 project bike rack of carbs and install them on the standard bike (with fo...
by UrbanPeasant
Wed May 29, 2019 7:51 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Minor Update: I tried a separate piston, needle and vacuum cap on carb3 - no different, still no detonation in the cylinder. I did this because of the sticking problem I captured on video earlier on in this thread. I thought that maybe I'd not sorted out the sticking problem, but it seems I have. An...
by UrbanPeasant
Thu May 23, 2019 7:08 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Hello, Phil I've done the 3rd gear, shut off test, from roughly 3500rpm: I don't think it's lighting up at the shut-off. I think the slightly brighter blue flash is just the spark getting bigger as the revs get slower. https://1drv.ms/u/s!AnQfkYySuMRHo3_51AAy4ZGbET1W I missed a fortnight of great we...
by UrbanPeasant
Sat May 11, 2019 2:33 pm
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

It's the carb. Carb 3 is not healthy. I just thought I'd see what happens when a flick the throttle half open. Not just a little tickle for small accelerator pump squirt, but a good big squirt. The cylinder lights up. A steady opening of the throttle even up to 4000rpm doesn't yield this result. It ...
by UrbanPeasant
Sat May 11, 2019 1:51 pm
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Hi folks, the introduction of a Colortune (thanks Maz) to the troubleshooting arsenal has revealed the problem. Check the 5 sec video for cylinder 1 - bunsen blue ring, fuel screw wound out some from the spot where the engine slows. I happy with cylinder 1. https://1drv.ms/v/s!AnQfkYySuMRHo3tQb5yV3N...
by UrbanPeasant
Wed May 08, 2019 2:58 pm
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Evening, been out ridden it. Plug has the cap and wire from plug 4 on it now, and vice versa. Plug 3 is still fouled, plug 4 is still fine. SO I'm happy that that rules out the wires and caps. Phil, it's def a full GL1100 rack of carbs. 1000s and 1200s carbs look quite different - vacuum caps are di...
by UrbanPeasant
Tue May 07, 2019 3:35 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Hello folks, thanks for the recent replies. I'm losing time to spend spannering presently, but did what I said and got the standard bike back together with its own carbs (the reason for this thread being that No.3 is seemingly causing plug 3 to get fouled) and tested some suggestions along the way. ...
by UrbanPeasant
Wed May 01, 2019 3:06 pm
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Hi Gord, on both my bikes I've plugged that vacuum advance spigot off on the carb as-per Randakks comment about it being barely noticeable so........ah (brain thinking that through as I type) right, the seized mechanical advance meaning the spark was unable to advance at all with increasing demand. ...
by UrbanPeasant
Sat Apr 20, 2019 4:31 pm
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Couple of days further on and where am I? Well, I've tried a different rack of carbs on it now, no joy. I thought these would have been good; ultrasonically cleaned, new seals, nice and tidy. But terrible, couldn't even move the bike in first gear with them on. Like the bike was leaning right out, a...
by UrbanPeasant
Fri Apr 19, 2019 5:53 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Hi Tom, thanks for looking, and for noticing! That was a typo I hadn't spotted - should have read '4'. I didn't miss one. And I agree on the low psi comment, though only from watching many many episodes of Wheeler Dealers where compression is tested on some car or other, and always seems to come up ...
by UrbanPeasant
Thu Apr 18, 2019 4:17 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Not sure what I was thinking with last night's post, perhaps my brain was free-wheeling, but the vacuum slide/piston was most definitely not moving freely in the vacuum cap. I just compared it to No.4 and posted this video: https://1drv.ms/v/s!AnQfkYySuMRHo3icVXyuY1hl1A_y To quote from #virgilmobile...
by UrbanPeasant
Wed Apr 17, 2019 3:59 pm
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Carbs are off, No.3 is in bits. Maz you asked about the spring on the air cut off - it was seated correctly, the little seal was in place, the diaphragm is only a couple of weeks old and is in good condition, the passageways around the cut-off are all clear. The fuel screw is in good condition, not ...
by UrbanPeasant
Tue Apr 16, 2019 3:51 pm
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Slight delay in the time taken to get the compression tester to me, so in the mean time I drained, flushed and filled the final drive. What came out was all wrong. I'm hoping the clean out will stop the leaking I was suffering from via the air breather. Indexed the plugs to pass the time too. Compre...
by UrbanPeasant
Wed Apr 10, 2019 10:52 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Thanks Jaime, Will hopefully have the compression tester tomorrow. In the meantime, the valve stem oil seals are below the carb-cylinder head venturi, so are you thinking that if an oil seal is failing I'll see that escaping oil on the sides of the venturi - blown (or sucked) upwards? I should be ab...
by UrbanPeasant
Tue Apr 09, 2019 6:59 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Bought a compression tester, should be with me in a couple of days. The fact that the plug seems oily is presently leading me in that direction, though I guess fuel+soot might seem oily too, and I wouldn't be one well enough versed to be able to spot the difference at present.
by UrbanPeasant
Mon Apr 08, 2019 2:56 pm
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Home again. Air cut off springs, sat into the centre of the cup they sit in as I put things back together. But you've asked the question so I'll have to check. The fuel screw needles were all fine; not bent (like in my other rack) and not broken. I'd be very surprised (and somewhat heart broken) if ...
by UrbanPeasant
Mon Apr 08, 2019 10:10 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Maz, how do I tell? It's a new cut off valve/spring/o-ring, and the passages are clear in the carb body that sit behind that valve. No doubting that (says the man who doesn't know why his carbs appear not to be working quite right). There seem to be 3 passages per cut off, plus the really tiny one i...
by UrbanPeasant
Mon Apr 08, 2019 9:25 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Hey RB, Bad plug? Probably not because I've already cycled the plugs around the 4 cylinders, and whichever plug ends up in there, ends up black. I should've mentioned that I'd done that in the original post. Thanks for the suggestion though. I hadn't come at it from a bad plug angle, I'd come at it ...
by UrbanPeasant
Mon Apr 08, 2019 8:29 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Thanks Maz, No washer, I've had the needles out. I did try the washer on some other 1100 carbs though, and found that if tightened the lock plug down in the tube, like it was with no washer, then it stops the needle moving and locks it solid. So I reversed that idea on those carbs, and carried on as...
by UrbanPeasant
Mon Apr 08, 2019 7:51 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

Murphy's Law, just landed on this thread - Spark Plugs fouling out - so I'll look into the posts there. Pretty confident I've not got a stuck float as it wasn't flooding on the bench with a good head of fuel. It's not burning oil and chucking it out the tail pipes. All 4 sparks appear good/the same ...
by UrbanPeasant
Mon Apr 08, 2019 7:41 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Re: Struggling with carb3/plug3

This is interesting, ish, the heat difference between the exhausts. The actual colour between the 2 sides is not relevant as I had the FLIR focussed at different spot, so it uses an arbitrary scale. But the fact that exhaust 3 is so much cooler than the others is what makes me think there's lots mor...
by UrbanPeasant
Mon Apr 08, 2019 7:18 am
Forum: GL1100 Information & Questions
Topic: Struggling with carb3/plug3
Replies: 43
Views: 2261

Struggling with carb3/plug3

Dear all, I'm struggling to bottom a problem with a sooty or perhaps oily plug in cylinder 3. I started out with this '81 1100 that hadn't run much for 2 years, it ran really badly, but I was told the carbs had been 'done.' Couldn't run the bike without near full choke, so I had the carbs apart. Var...
by UrbanPeasant
Wed Mar 20, 2019 7:46 am
Forum: GL1100 Information & Questions
Topic: GL1100 running lean?
Replies: 19
Views: 1264

Re: GL1100 running lean?

Landed on a video that explains the pilot screw quite nicely. Gets to it at about 8 mins having shown animations of the various circuits in operation on CV carbs like these. I'm almost certain the Haynes manual called this screw a pilot air screw. I'll check later, but I'm pretty happy now, it's fue...
by UrbanPeasant
Fri Mar 15, 2019 4:27 pm
Forum: GL1100 Information & Questions
Topic: GL1100 running lean?
Replies: 19
Views: 1264

Re: GL1100 running lean?

It looks like the main culprit of my terrible running problem was the air cutoff diaphragms. Upon investigation (I'd been told the carbs were rebuilt 18-24 months ago) 3 of the diaphragms were knackered. One of those had been 'repaired' with silicone sealant! The rubber surface of all of them had de...
by UrbanPeasant
Sat Feb 23, 2019 11:51 am
Forum: GL1100 Information & Questions
Topic: GL1100 running lean?
Replies: 19
Views: 1264

Re: GL1100 running lean?

It's not the fuel pump. Bugger it. Same problem with the pump from the other bike. I'm going to have to swap the carbs out, and see how I get on then. Maybe something's still blocked. Don't really want to have to do that because the other one is all correct together, and on the road. There's only so...