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 Post subject: Carburator or ignition problems ??
PostPosted: Sun Sep 06, 2015 6:26 pm 
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Joined: Sat Jul 13, 2013 6:07 pm
Posts: 16
Location: Montreal, Canada
Hi
I knew I had a problem with my rear cylinder because the spark plug was wet and the temperature of the back head was a lot cooler than the front head.
So last spring I ordered a lambda sensor for both cylinders, I welded the sensors on an old header.( B sensor is back )
Now I have all kind of main jet, air jet and needles, I am ready to do some jetting.
But OMG :shock: the rear cylinder is not running (no reading ), first I reverse the lambda sensors and spark plug to test sensors and plugs (OK)
The spark is good, the compression is good 160 psig on both cylinders and I have gas going in but something is weard, when I crank the carburator arm of the rear cylinder I can feel a lot of air and gas coming back from the cylinder ??

On the road when there is load on the motor I can feel the torque and the lambda give me some reading, on first gear if I give a quick shot the front wheel goes up and both sensors are about the same but with no torque the rear sensor is always flat, no reading.
Ignition
https://youtu.be/7-DsRNEnIiI
Spark Plug
https://youtu.be/yAQfPSH8YwU


Carburator
https://youtu.be/AYTbjdW9d_4

Thank you to marcotoy for the oil cooler.
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IMG_5127-1.JPG [ 122.55 KiB | Viewed 811 times ]

and thank you to Carlo for my new '' pedane ''
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Carlo 2.jpg
Carlo 2.jpg [ 178.22 KiB | Viewed 811 times ]

Attachment:
IMG_5126.JPG
IMG_5126.JPG [ 127.31 KiB | Viewed 811 times ]


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 Post subject: Re: Carburator or ignition problems ??
PostPosted: Sun Sep 06, 2015 7:24 pm 
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 1803
Has anyone noticed a pattern here? Look for the other similar postings: why is it always the V (rear) cylinder? MikeV


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 Post subject: Re: Carburator or ignition problems ??
PostPosted: Mon Sep 07, 2015 5:26 am 
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Joined: Mon Nov 08, 2010 8:57 pm
Posts: 104
Location: Quebec
Hi Carl,

I would check if the rear carburator is perfectly clean. Specially the smallest jets (the horizontal one in particular) that may be blocked, so not enough gas is entering at idle speed and throttle at 1/8.

I will also meet Carlo on September 21 and buy a set of adjustable footrests from him.

Gilles


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