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Post by rich on Jul 13, 2014 17:37:12 GMT 1
I went to take the hybrid for a spin this afternoon, bear in mind I recently had an issue with it running on one cylinder but I fitted new caps and plugs and it was fine after that. Did a 90 mile run and it flew. That was about a week and a half ago. It started up ok today but felt flat and wooly when I pulled away and wouldn't clear. I pulled over and the right side exhaust was cold and only smoking very little. I revved it hard but it would not cut in and just spat oily shit out of the pipe. Limped it back to the workshop and tried another plug - no difference. Swapped HT caps from left to right, no difference. Took the right side carb off, popped out main and pilots and were both clear, also blew through airways and removed and reset pilot screw. Put it all back together and still no sodding difference!! Right side will just not fire and the pipe is cold. Only thing I did notice is the carb body is quite cold, could it be some sort of carb icing? As I said it ran perfectly when I last used it. It's only done 600 odd miles since the rebuild.
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Post by looey on Jul 13, 2014 17:46:17 GMT 1
Do you have another right hand carb you could try on it, or maybe swap the carbs across (don't know what type of carbs you're running and if that would be possible) ?. I had trouble with an X7 we bought earlier this year that wouldn't run properly on the right cylinder. Checked all the carbs were clean, everything setup correctly but still wouldn't play. Borrowed the right hand carb from Tracey's white X7 and then perfect, ran spot-on. Must've been something hidden going on in the carb beyond anything removeable (including needle jet body etc.) or setup. Just a thought to eliminate the carb if nothing else  |
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Post by rich on Jul 13, 2014 19:12:48 GMT 1
Yep, running PWK 28's so don't have any spare carbs to try. Cheers for the info about the security screws, I'll try that next. Bloody things are a complete pain the in the arse to refit though with the standard airbox and PWK inlet rubbers, almost tempted to fit Ramair pods.
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Post by rich on Jul 13, 2014 19:40:00 GMT 1
Well I've got WD40 with a red straw and fishing line! How do you do it then Mart?
I leave the trumpets attached to the carbs when I remove them but the issue is getting the lip located all the way round at the airbox as it keeps popping inside when I put them back on.
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Post by looey on Jul 13, 2014 19:46:36 GMT 1
And a quick blast with a hairdryer to get them nice & soft first  They do run pretty sweet with pod filters on the PWK28's. The trouble I've had with mine over the last 12 months, re-fitting the carbs with the standard airbox would've done for me I reckon  |
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Post by rich on Jul 13, 2014 19:48:02 GMT 1
Yep, had PWKs and pods on the Yamagamma and that ran really well.
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Post by rich on Jul 13, 2014 23:51:44 GMT 1
Well I went back round this evening and whipped the right hand carb off again. Removed the security screws and jet holder, cleaned and blew everything through and its clean as a whistle. Put it all back together and exactly the same. Tried one more thing which was to swap the plugs from one side to the other and result!! (sort of). Right side fired into life but the left side then wasn't running. Oh well, at least it's not anything to do with the carbs or physically wrong with the engine. I tried a couple of old spark plugs in the left side and it briefly ran on both but then fouled again. Swapped plugs back and it ran on the other side. Took the tank off and checked all the HT connections. Both sides seem be sparking with plug resting on the head but won't run consistently on both pots. I can only assume it's fouled another plug so I am going to try some new Iridiums and see if that sorts it. I did have a thought though - this seems to have started since I've been running the EXOL oil. I have NEVER had any issues like this before and the spec of the bike hasn't changed over the years. Coincidence?
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Post by LC_BOTT on Jul 14, 2014 7:30:26 GMT 1
have you tried a different grade of plug as well? like a 7 'just' to get it running and cleared? I used to have probs with higher grades until it was up to temp?
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Post by rich on Jul 14, 2014 7:37:54 GMT 1
Running premix at 40:1 and B9ES plugs. Just ordered some BR9EIX iridiums so will see if that sorts it.
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Post by 4l04ever on Jul 14, 2014 9:38:12 GMT 1
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Post by looey on Jul 14, 2014 10:46:55 GMT 1
So what's the difference between an EG & ES plug ?. (I see it now, it has a finer wire centre electrode) I wouldn't have thought it would be the oil, the Exol Optima is a clean burn, low smoke fully synthetic oil, especially running as weak as 40:1 ?. I guess if nothing else has changed then you could go back to your old oil and see what happens but I've been running that same oil in a couple of bikes for a while now with no problems. My Hybrid was fouling plugs when I was running it in with B9ES' fitted, I dropped to the standard B8ES (no resistors) and it's run sweet ever since. I think if you're safe/correct on the jetting, there's no need to go to a cooler running plug that won't burn as clean ?. |
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Post by 4l04ever on Jul 14, 2014 12:11:44 GMT 1
You are supposed to go higher on the plugs until it fouls, the go back down one, so maybe 8's would be fine?
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Post by looey on Jul 14, 2014 17:50:54 GMT 1
Yeah sounds a good plan.
I'm running 152 mains in my PWK28's with B8ES plugs and after ridding it pretty briskly the plugs are a nice safe colour .
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Post by rich on Jul 14, 2014 18:25:59 GMT 1
Yeah sounds a good plan. I'm running 152 mains in my PWK28's with B8ES plugs and after ridding it pretty briskly the plugs are a nice safe colour . Is that with filters or airbox? |
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Post by looey on Jul 14, 2014 18:30:31 GMT 1
Sorry yeah shoulda said, that's running Foam Pod filters. It doesn't like 9 grade plugs with that setup Took it out for a good brisk run today, running very nice but now I've noticed it's got charging issues !!!!  |
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Post by rich on Jul 14, 2014 18:47:53 GMT 1
Ahh bugger, there's always something isn't there! Cheers for the info, I'm off to have another play so will report back later |
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higgsy
Thrash Merchant
Posts: 458
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Post by higgsy on Jul 14, 2014 20:53:18 GMT 1
The EG is a race orientated plug, it has a thinner core wire, I personally think it's the plug to use but having the thinner core means they don't last as long
Rich, the Loctite YPVS/LC refuses to go on Silkolene, runs like a bag O'Sh*te, miss fires and generally miss behaves. On the XR77 it's as good as gold. That's on 30-1. PWK 28's, 152.5 mains, whatever needles were in the carbs, Ramair oval filters on KR1s extension tubes, B10EG plugs. Runs like a dream on the Martin pipes :-)
I'd change the oil back mate before doing loads of taking apart even just to eliminate it. maybe it doesn't like being pre-mixed?
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Post by rich on Jul 14, 2014 22:17:52 GMT 1
Found some used plugs in my stash of parts so cleaned up an old B9ES, whacked it in and fired up first time. It did try and fluff when I first pulled away but I kept it revving and once it cleared off it went! Gave it a hard thrash to clear all the crap from the exhausts did 20 miles or so and it went like a rocket. Still running the EXOL at the moment so I'll see how it runs on the BR9EIX's, if it still plays up I'll stick some B8ES's in and if that doesn't work I'll have to go back to expensive oil  |
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