Lucia is running rough (Zane 750s Formula)

cooky

cooky

New member
Location
Devon
Service and MOT done this week. Now Lucia is misfiring and revs don't drop for a few seconds after throttling back.
Valves checked at service but did not need adjusting and not much else apart from lubes, plugs and cables. Any ideas?
Will take back to mechanic but would like to have an idea what might be wrong before I handing her over again. Cooky.
 
Choke cable was changed and throttle lubed. Choke cable operating fine.
I'm wondering if crankcase breather has come off as this would make mixture lean and would cause misfire. Not so sure would cause temporary raised revs though!
 
maybe adjust the co2 sensor inside the ECU box (its the tiny little screw next to the chip)

also, if full service was done including plugs, when airbox was reinstalled the mechanic may not have gotten the 3 airbox hoses (including the breather) all the way back on.  I would suggest getting the airbox cover off and taking a look to make sure the throttle body assembly is completely seated in the rubber boots to inlets and all 3 hoses to the throttle body assembly are properly hooked up.

If that doesnt do it, check the plugs and plug wires, make sure they are correct (I have seen these get crossed).

Other than that, only thing I can think of is the PK rotor sensor.  Maybe pop off the cover and make sure there isnt anything attached to the sensor like a little screw or something

Cheers

martin
dallaslavowner
 
Vacuum hose on the back of the airbox, they run like a dog if its been knocked off

Did he just change the fluids or decide that hed like to fck around with a few settings?

What was his responce to giving you back a bike that is misfiring?

Might be time to find a new guy
 
Have you had the cover off and watched what the cables/throttle bodies do when rolled off the revs? Check all the connections are in correctly too. Its a fiddly wee bugger of a bike. The misfire could be the plugs or a bad earth. Failing that swear that you will burn the heap of s***e and look forward to an easy life with out it, or is that just what I do? :D

Cameron
 
Thanks for the advice. I will check suggested items. I have not fallen out with my Zane yet. She is far too pretty to get cross with and I went into this relationship with my eyes open. I've got a Japanese bike to swear at because I am not expecting it to go wrong. The Laverda comes with low expectations! Cooky
 
Back to mechanic and now fixed. Problem was perished breather tube at back of crankcase.
Not easy to access without removing fuel tank so have spliced new tubing in. Bike riding beautifully now with no misfire or erratic revs.
Mechanic as good as his word, and was very apologetic. He also fitted new air intake tubing free of charge. To bloke. I can see why there is a 2 week wait to book a service.
Pity weather is so awful in UK. First sunny day and Lucia is going on a long twisty ride to Cornwall.. :D
 
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