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Could wrong adjusted camshafts lead to very poor fuel efficiency?

  • Thread starter Thread starter Himer
  • Start date Start date
H

Himer

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So now I am asking this question here, yet another one. I am working on GSX 400F with very poor fuel efficiency 8-12L per 100 km. I asked about carbys here: http://www.thegsresources.com/_forum/showthread.php?248355-Mikuni-BS26SS-informations-parts

I have ordered reproduction jets and needle jet P-0 from japan, currently waiting for mail to come. I suspect mechanical wear on some parts in carbys especially needle and jet needle. Today I removed cylinder head cover to do valve adjustment cause I heard few knocking very hard. Few are almost stiff in there - less than 0.05mm few are 0.10. But I have noticed something else. I have set mark T on advance governor aligned with crankcase but... Camshafts have cuts that should go with gasket surface completely parallel when in this position. Thing is... They are off there, not parallel. So I am suspecting that camshafts might be badly alligned and maybe fuel consuption problem lies there.

I just wonder if misaligned camshafts could lead to radiculous fuel consuption.

I'll post a pic of it here tomorrow now I cannot get back to the garage.
 
I think cam timing can affect both performance and fuel economy.

The manual shows the proper method of checking the cam timing. The camshaft notches are not used for proper timing, you need to look at the marks on the camshaft sprockets for that. Your manual will have the details.
 
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