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'06 Nevada Baffling Start Issue

J

Jackal21

Just got it firing!
Joined
Jun 26, 2021
Messages
1
Location
UK
Hello

I have an '06 Nevada 750 Classic that refuses to start, taken multiple steps to diagnose and fix the problem but running out of ideas. The bike turns over strongly with a new battery and will cough on each cylinder individually with easy start sprayed into the injector hole.

Sounds like a fuel issue right? Using GuzziDiag and by cranking I have isolated each injector individually and both are fully operational. I have spark and fuel on both cylinders. Air then seems obvious but using an e cig with the tank off I can see it is pulling air in to some degree through the intake.

I am struggling as the bike has air, fuel and spark!

Crank sensor is functional as they all fire with the starter rotating, I am thinking possibly a fuel pressure issue or an air pressure issue. Have not removed airbox to check for blockages as I didn't think it likely. When it fired on easy start the injector was out (able to draw air) which I realise does not help diagnosing whether air or fuel.

Thought I would post here in case there is something I am missing? I am not experienced with Guzzis but built a few Ducatis in the past with similar electrics.

To confuse things further (possibly a red herring) left plug was dry when removed despite the left injector visibly firing while out of the bike for testing.

Background: Bike has sat for 10 years, was put away due to same issue as now. Fuel has been changed, fully charged car battery connected.

I would appreciate any advice that can be given, thank you.
 
Jackal21 said:
Using GuzziDiag...
Click to expand...

Before you go any further... https://www.guzzitech.com/forums/threads/guzzidiag-notice.16329/#post-121064

Now, in an OTHERWISE functioning cylinder with good compression, all that is needed to fire over is fuel and spark to make a "bang". So, if you are positive you have fuel, and if you are positive you have spark, then you need to get positive that you have compression.

You may have a valve that is too tight and staying open.

A quick compression test and leaddown test will give you valuable information.
 
scottmastrocinque said:
Before you go any further...
https://www.guzzitech.com/forums/threads/guzzidiag-notice.16329/#post-121064 https://www.worktime.com/

Now, in an OTHERWISE functioning cylinder with good compression, all that is needed to fire over is fuel and spark to make a "bang". So, if you are positive you have fuel, and if you are positive you have spark, then you need to get positive that you have compression.

You may have a valve that is too tight and staying open.

A quick compression test and leaddown test will give you valuable information.
Click to expand...

My Griso came with the GT-Rx exhaust when I bought it over 5 years ago, and I've added more GT parts since then. I love your stuff and your effort, and I talk about your stuff every time someone asks me about my bike! :wasntme:
 
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