dilly
L plate rider.
Posts: 37 
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Post by dilly on Nov 6, 2013 19:10:22 GMT 1
Guys
I bought an N1 at the weekend and have a problem you may be able to help me solve.
The bike has stood in a garage for the last 3 years, she starts but only fires on the RH cylinder.
I have given the carbs a quick clean not a proper one mind, (that is the jets look clear) and have checked the plug
is making a spark, but she'll still only fire on the RH cylinder.
Any advice would be appreciated.
Ta much
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Post by kostas on Nov 6, 2013 19:32:51 GMT 1
Swap the carbs and check again.
Kostas
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 6, 2013 19:34:52 GMT 1
Good idea, i'll try later Thanks.
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Post by reggieperrin on Nov 6, 2013 19:34:59 GMT 1
Hi Dilly... Welcome to the forum, another N1...! someone else with good taste...!! you'll most likely see me twittering on about finding my old N1 elsewhere. I don't suppose yours is B981 MFG is it..  Hope you get to the bottom of the running problems... Reggie |
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 6, 2013 19:35:50 GMT 1
Sorry Reggie, mines on a C plate
I'd love to find my old F1 and my 500.
C980 JWE (f1) and D945 VGM (500)
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Post by reggieperrin on Nov 6, 2013 19:38:28 GMT 1
No problem... I'll keep looking... I have an N1 not far off from being finished, I just wanted MY N1...  If yours is the one in your avatar, it looks great.. |
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 6, 2013 19:39:52 GMT 1
Yes that's as I found it, its a great base to start a resto from
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Post by Shytalk on Nov 6, 2013 20:34:18 GMT 1
You might find the emulsion tubes clogged.
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Post by muttsnuts on Nov 6, 2013 20:53:52 GMT 1
presumably you have checked that you have some compression on the cylinder that isn't firing?, assuming you have, I'd go for the emulsion tubes as well, I am also assuming that the plug is getting wet on the cylinder that isn't firing?, if not, check that your float needle isn't stuck or the fuel line isn't blocked
have you tried putting petrol down the plug hole and then starting it up, does it run on 2 for a brief moment if you do that?
oh and welcome to the forum
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 6, 2013 22:17:53 GMT 1
Thanks guys, I didn't clean the emulsion tubes so i'll give that a go too,
There seems to be a fair amount of pressure coming out of the exhaust so
I have to assume the piston hasn't holed.
I'll report back tomorrow.
Cheers
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 7, 2013 16:36:43 GMT 1
OK todays update.
I swapped the carbs over first, she fired up on the LH cylinder, Result!
that's cleared up a couple of other probable causes.
So I strip the problem carb and as a few of you mentioned the emulsion tube was completely blocked.
I gave it a good clean and unblocked the holes on both sides of the tube, and double checked the
main and pilot jets were clear and reassembled the carb, then fitted it to the bike.
It still will not fire on the LH cylinder, aaaaaaaarrrrrrrrrrrhhgggggg!
So its definitely a carb problem, any ideas what else could be blocked/F*@ked???
Cheers
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Post by oldelsieboy on Nov 7, 2013 16:55:05 GMT 1
have you tried putting petrol down the plug hole and then starting it up, does it run on 2 for a brief moment if you do that? Have you tried this option? OEB |
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 7, 2013 17:12:45 GMT 1
I didn't need to OEB, i swapped the carbs over and it fired, so there seems to be a problem with that LH carb
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Post by oldelsieboy on Nov 7, 2013 17:30:45 GMT 1
I didn't need to OEB, i swapped the carbs over and it fired, so there seems to be a problem with that LH carb Oops, misread your update. So presumably when you swapped the carbs it did not fire on the R/H cylinder. OEB |
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Post by muttsnuts on Nov 7, 2013 17:48:10 GMT 1
that's the choke side carb isn't it, check the right float bowl is on it and also that the float needle valve is letting fuel through, have you checked to confirm that the spark plug is getting wet when you have the LH side carb on, if your not sure, connect the LH side to the petrol line with the float bowl off, turn the fuel on, lift and lower the float to see if petrol is getting through, also have you checked the float height etc
and I know this might sound daft, check that the corrct slide is fitted on that side, if its the wrong way round it won't start and I have seen it where a bike has been put back together with 2 of the same slides fitted, so one side runs and one side doesn't and its not obvious at sight glance !
Also, does the bike attempt to fire at all on that side at any throttle position?
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 7, 2013 17:53:20 GMT 1
No OEB, I didn't explain that very well, when I say swapped the carbs I meant I just fitted the RH carb to the LH cylinder
Just so I could rule out a problem with the LH piston/coil.
This I think narrows down my problem to the LH carb.
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 7, 2013 18:09:51 GMT 1
Mutt, thanks for your reply. Ok, the float bowl is the correct one for the LH (choke) carb. It has a small brass tube/hole in the bowl and the RH side doesn't (is that correct?).
I have had the plug out to check the spark and although the plug wasn't dry it wasn't very wet either, if you get what I mean.
I'm assuming that all is ok with the float needle valve, the bowl fills with fuel and doesn't piss out like it would if the float was stuck and i've had the needle valve out and cleaned it. But I will do the check you have suggested.
I've not checked that the slides are in the correct carb, are the slides noticeably different? I'll check this later.
And finally, it doesn't seem to matter where the throttle is positioned, she just wont fire on that side with that carb.
Doh!
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Post by seahorse83 on Nov 11, 2013 18:43:07 GMT 1
Hmmm, over flow tubes in both pretty sure there is.
There is a difference in the float bowles, one is designed for the left the other is designed for the right.
Just swap the float bowls left to right if your unsure.
Slide cut aways are marked and should be the same.
Needles are marked and should be the same.
I take it you have double checked the pilots are the right size and clean.
Failing that, im going for vac line no connected to its proper place
Food for thought
Hope it works out for you
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 11, 2013 23:35:43 GMT 1
Thanks for the replies chaps,
I've still not solved the problem as yet.
I've stripped the LH carb and I'm gonna
Drop it in an ultrasonic at work, then I'll give it a blast with the airline.
With regards to the carbs they look to be assembled correctly, with the correct
Float bowls/slides vac pipe etc, so I can only assume that there must be a blockage
somewhere.
I've seen 'carb repair kits' on Yambits website, would that be worth a try?
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phil38
Thrash Merchant
Posts: 426
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Post by phil38 on Nov 13, 2013 18:27:21 GMT 1
It could be the fuel ones or tee piece blocked, although I guess you'd have ruled this out as part of the carb swap test. Ultrasound bath is a good plan.
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 15, 2013 20:54:45 GMT 1
Dropped the carbs in the ultrasound at work, then blew out all of the channels with the airline.
Once home I assembled the bike.
Now she fired on both for about 10 secs before the LH cylinder shut down again. FFS!!!
So I swapped the floats and float valves between the 2 carbs, (to rule out lack of fuel, knackered valve) - no joy.
Swapped the carbs again to rule out coil/ht leads/plug, and the bike fires on the LH cylinder.
That LH carb is f**ked, but I don't have a clue why.
I've ordered a couple of card repair kits from Yambits, lets se if that does the trick.
I'm scratching my head now. Any more ideas fellas?
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Post by spencerd on Nov 15, 2013 22:40:33 GMT 1
Sh1t bad luck i'd say!
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 15, 2013 23:01:00 GMT 1
I've hit the F@*ker with a hammer and set the bike on fire now.
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Post by carioca656 on Nov 16, 2013 10:15:04 GMT 1
did that fix it??
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Post by mikee on Nov 18, 2013 10:36:22 GMT 1
did it light ?
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dilly
L plate rider.
Posts: 37
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Post by dilly on Nov 18, 2013 10:44:30 GMT 1
Only on the one side
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Post by Roofmonster on Nov 18, 2013 10:58:41 GMT 1
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