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Strange one this one!

 
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Chrissb6



Joined: 11 Jan 2012
Posts: 33
Location: Nottingham

PostPosted: Fri May 08, 2020 11:04 pm    Post subject: Strange one this one! Reply with quote

Hi Guy's sorry me again,
having sorted the starter solenoid issue thanks to Jonny, the bike been filled up with fresh fluids, the fuel pump been taken out and bye passed as recommended. Went to go for a start up using an aux fuel tank which was hung from a beam from the garage roof "so plenty of head". No 1 and 2 cylinders fired up almost straight away but nothing from 3 and 4, I've double checked the fuel lines everything correct there, tried again, again the same.
I'm puzzled if l'm correct, the cylinders on the ignition circuit 1&4 and 2&3 are paired - connected together so doubting it's a coil or electrical that leaves fuelling but to loose both cylinders strange one. Any pointers - ideas of a fix or a reason for this problem much appreciated.
Cheers
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brian



Joined: 22 Aug 2011
Posts: 3484
Location: Australia

PostPosted: Fri May 08, 2020 11:29 pm    Post subject: Reply with quote

Are 3 & 4 getting spark Chris? Iíve had spark plugs fail on my 6 in the past, but not 2 at the same time. Going by what youíve described, there should be no reason for it to be a fuel issue if all youíve done is remove the pump.
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Current motorcycles - '99 Bimota DB4 #104, '96 Bimota SB6 #1165, Ď94 Bimota DB2 J #652, '99 Bimota DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, Ď94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, Ď61 BSA A10 650
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 500
Location: NE London

PostPosted: Sat May 09, 2020 11:03 am    Post subject: 6r Reply with quote

Have you connected the fuel pipe into 3 & 4? Has it stood for a long time - do you need to re-furb the carbs?
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 500
Location: NE London

PostPosted: Sat May 09, 2020 11:07 am    Post subject: 6r Reply with quote

Are the carbs balanced? How many turns on the mixture screws?
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Chrissb6



Joined: 11 Jan 2012
Posts: 33
Location: Nottingham

PostPosted: Sat May 09, 2020 12:55 pm    Post subject: Re: 6r Reply with quote

Jonny B Bad wrote:
Have you connected the fuel pipe into 3 & 4? Has it stood for a long time - do you need to re-furb the carbs?
Hi Jonny, had the carbs on the bench float chambers off and checked they were in very good shape to be honest. T piece fitted to the fuel line from the tank l suppose one line to 1&2 carbs and the other to 3&4 . I'm thinking of an air lock to 3&4 but my aux tank has more than enough head to force fuel through l would hope? I'm thinking it's fueling being it's 3&4
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 500
Location: NE London

PostPosted: Sat May 09, 2020 1:09 pm    Post subject: 6r Reply with quote

Yes, sounds like fuel to me. Water in the float bowls?
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 500
Location: NE London

PostPosted: Sat May 09, 2020 1:15 pm    Post subject: 6r Reply with quote

Have you connected the aux tank with a t piece or a y piece? Perhaps youíve got too much head of fuel for 3 & 4 and itís overwhelming the float valves, to give you too high a fuel level in those carbs for the pilots to do their thing.
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Chrissb6



Joined: 11 Jan 2012
Posts: 33
Location: Nottingham

PostPosted: Sat May 09, 2020 3:03 pm    Post subject: Reply with quote

Give me strength, believe it or believe it not, 2 duff spark plugs on 3 and 4. A new set fitted now all good
Thank's for your support and backup fellas
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brian



Joined: 22 Aug 2011
Posts: 3484
Location: Australia

PostPosted: Sun May 10, 2020 12:55 am    Post subject: Reply with quote

Chrissb6 wrote:
Give me strength, believe it or believe it not, 2 duff spark plugs on 3 and 4. A new set fitted now all good
Thank's for your support and backup fellas


Thatís why I suggested checking the spark first. As I said, spark plugs do seem to fail in these bikes, but having two go at the same time is unusual. Glad you got it sorted
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Current motorcycles - '99 Bimota DB4 #104, '96 Bimota SB6 #1165, Ď94 Bimota DB2 J #652, '99 Bimota DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, Ď94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, Ď61 BSA A10 650
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2bims



Joined: 03 Apr 2010
Posts: 6833

PostPosted: Sun May 10, 2020 8:15 am    Post subject: Reply with quote

Maybe one was on its way out....and the strain on its adjoining cylinder put paid to the other one....Light bulbs in series are like that....one blows....dont replace it quick enough...and the other blows due to it receiving an increased load.....
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Evilchicken0



Joined: 12 May 2010
Posts: 2973
Location: London

PostPosted: Mon May 11, 2020 9:59 pm    Post subject: Reply with quote

Dont use iridium plugs in these engines they foul very quickly.
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