Author Topic: C11G 54 won't start  (Read 2167 times)

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Offline Pete

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Re: C11G 54 won't start
« Reply #180 on: August 11, 2019, 07:07:35 pm »
Did the pipe blue before you sorted the engine? or since?
Pete
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1932/56 C12Rudge

Offline Faster

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Re: C11G 54 won't start
« Reply #181 on: August 11, 2019, 07:34:27 pm »
The pipe got blue since engine started and was not timed correctly and the cylinder of the carb was kept a bit high to keep it running ( was rich ) . Anyway , now I cannot say if she was set correctly since the beginning that would happened . 

Offline donkey

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Re: C11G 54 won't start
« Reply #182 on: August 11, 2019, 07:44:37 pm »
If its an after market pipe it may not be of the quality of the original downpipes, I have seen after market pipes turn blue with the carb and timing set up spot on.
donkey

Offline Faster

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Re: C11G 54 won't start
« Reply #183 on: August 11, 2019, 07:50:16 pm »
Hello Donkey

Yes , it's an aftermarket down pipe and if that it's your conclusion it makes sense .

Offline ianinglis

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Re: C11G 54 won't start
« Reply #184 on: August 11, 2019, 08:52:42 pm »
yes the blueing of the pipe has no relevance - its down to thickness of pipe and type of chrome



ian
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Offline chaterlea25

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Re: C11G 54 won't start
« Reply #185 on: August 11, 2019, 09:33:10 pm »
Hi All,
Congrats Faster, the bike looks amazing
More credit to you is due because you are located far away from any source of parts

Carb jetting is no longer related to the original recommendations as the fuel available in 2019 is not the same as available when the bike was made

Start off with a main jet around 2 sizes larger than original and the needle at least one notch higher in the slide
if a new needle jet has been fitted,
The needle jets wear from the needle rubbing against them leading to richer mixture
All subject to how the bike is running now?????/
Has the engine been rebored?
If it has, and you have done a lot of stationary running with new rings it is possible to glaze the bore

As I said earlier road testing is the only way now
Short runs starting and returning home so you can check things in comfort rather than the side of the road
check for engine heat after a mile or two, you can literally smell over heating
if you feel it is too hot stop and let it cool off, then check the spark plug colour,
If it is too lean it will appear white or greyish,
dark brown/black will be too rich

Well Done ;D
John

Offline hampshirebiker

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Re: C11G 54 won't start
« Reply #186 on: August 11, 2019, 09:38:40 pm »
I said that about plug colour recently and got slagged off (not by you John) for it. I was even told that with modern fuel the colour is not relevant; or words to that effect. Ah well.
« Last Edit: August 11, 2019, 09:42:36 pm by hampshirebiker »
Postal - Liphook Hants - But just into West Sussex.

Offline timsdad

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Re: C11G 54 won't start
« Reply #187 on: August 12, 2019, 08:07:08 am »
It was probably me that stated plug colour has little relevance nowadays if you just take your plug out and look at it. I don't base any of my technical comments on theory, guesswork, what I've read or what I've been told - just my own experience. This is in the hope of others not making their own expensive mistakes.

I've spent hundreds of hours getting carburation right for the track and the road and stand by my comment that plug colour is usually not the indication for fuel mixture that it was, unless you do a proper plug chop, which some folk don't accept is a worthy test. If you think a light coloured plug means an engine is too weak, you'll richen the mixture too much, lose power and maybe reliability. That's just advice for inexperienced folk who have the need to ask the question in the first place.

My old Triumph has its original carburettor and jetting apart from a 200 main jet, I ride it just about every day and the plugs look almost white. It runs fine. My 2005 Injection Tiger is bog standard, I change the plugs every 18,000 miles and they always look white - it still runs fine after 87,000 miles.

Ray
Just a motorcyclist.

Offline Faster

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Re: C11G 54 won't start
« Reply #188 on: August 13, 2019, 05:08:42 pm »
Hello John

Thanks  :) . As I have mentioned before , credit goes to you and to all that have been helping me over here as well .

From your words , should I go to a main jet around 2 sizes larger ?
Needle it's on the third notch , should I move it to the 2nd from the top instead ? . ( Needle was not replaced )
Bike runs ok'ish ! ( mind you , I don't have previous experience on a bike like this and the rear drive sprocket  is quite small for this island which makes gears very long . )
Going up I just manage to be on 2nd gear . I feel there is a lack of power ! On flat areas she's run well .
I am not sure if the the engine was rebored . I can tell from what I see from the SP hole that the piston is quite shiny ! Another thing I have noticed is when I quick without the SP there is a strong flux of air coming out .
SP it's a bit dark but dry except the round pole that holds a thin layer of carbon .

Thanks

Offline chaterlea25

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Re: C11G 54 won't start
« Reply #189 on: August 13, 2019, 10:39:56 pm »
Hi Faster,
The new piston would suggest that the engine will need running in?
Try shining a light into the plug hole to see if you can see the cylinder wall?
If you can see the honing marks (lots of x's on the surface) it suggests it has been rebored

Moving the needle "down" (clip up) makes the mixture weaker (lean)
Your description of the spark plug sounds ok , maybe a little rich, but better like that for now than lean

My picture (not very good) shows two plugs I took out of the Vincent I got running recently
The rich mixture was I found due to worn needle jets and a too high a fuel level in the carbs

John

Offline hampshirebiker

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Re: C11G 54 won't start
« Reply #190 on: August 13, 2019, 10:52:45 pm »
Why do I think you posted a picture of a Pug John? ;D
Postal - Liphook Hants - But just into West Sussex.

Offline Tman

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Re: C11G 54 won't start
« Reply #191 on: August 14, 2019, 09:30:09 am »
I agree with the idea that with modern ethanol-heavy fuel means accurate plug chops aren't always reliable (as further up the thread)  and I also still believe that sooty = rich, choccy brown = good and white = dangerously lean.
I'd be happy with the brown Vincent colour.

Offline elevensies

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Re: C11G 54 won't start
« Reply #192 on: August 14, 2019, 11:50:45 am »
ohhhh this sounds just like one of my past threads


Offline chaterlea25

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Re: C11G 54 won't start
« Reply #193 on: August 14, 2019, 08:38:17 pm »
Hi All,
Quote
Why do I think you posted a picture of a Pug John? ;D

 ;D ;D ;D ;D ;D ;D
Had a good chuckle there HB

Plugs were fkn Hot so I had to wear the hide glove to hold them  ::)
I wish I had bought more of those gloves while in USA last Year

John