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Valve noise from a Yamaha 40

 
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SEA3PO



Joined: 02 Nov 2003
Posts: 1835
City/Region: Chester
State or Province: CA
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: SEA3PO
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PostPosted: Sun Oct 14, 2007 10:54 pm    Post subject: Valve noise from a Yamaha 40 Reply with quote
I have a 3 year old Yamaha.....that has idling problems.... Today after about a 2 hour run at 4800 rpm (from Santa Barbara to Channel Islands) it idled just fine but made loud valve noise..... I can't imagine it was hot.... but what else would cause valve noise at idle ?? This happened about a year ago...I took it to the dealer...and they said there was nothing wrong and they could not hear the valve clatter....so it must be heat related ....right ???

Ideas anyone ??

Thanks

Joel
SEA3PO
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tsturm



Joined: 01 Nov 2003
Posts: 1165
City/Region: Soldotna
State or Province: AK
C-Dory Year: 2003
C-Dory Model: 25 Cruiser
Vessel Name: JMR TOO
Photos: JMR-TOO
PostPosted: Mon Oct 15, 2007 12:24 am    Post subject: Re: Valve noise from a Yamaha 40 Reply with quote
SEA3PO wrote:
I have a 3 year old Yamaha.....that has idling problems.... Today after about a 2 hour run at 4800 rpm (from Santa Barbara to Channel Islands) it idled just fine but made loud valve noise..... I can't imagine it was hot.... but what else would cause valve noise at idle ?? This happened about a year ago...I took it to the dealer...and they said there was nothing wrong and they could not hear the valve clatter....so it must be heat related ....right ???

Ideas anyone ??

Thanks

Joel
SEA3PO



Check the oil?
I had the camshaft / timing belt tensioner on my F-100 Yamaha make a tick, tick, tick whenever it felt like it.This was after about 500hrs. I replaced both all is well. Hook up the Muffs take off the cover run it & look and listen Mr. Green Beer
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SEA3PO



Joined: 02 Nov 2003
Posts: 1835
City/Region: Chester
State or Province: CA
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: SEA3PO
Photos: SEA3PO
PostPosted: Mon Oct 15, 2007 1:07 pm    Post subject: Reply with quote
Thanks...I will check that this morning..... Yes the oil is fine...first thing I checked.... and not overly hot or burnt smelling... (this is why I doubt overheating) but I had never thought about the tensioner...it is in about the right area...

Thanks

Joel
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SEA3PO



Joined: 02 Nov 2003
Posts: 1835
City/Region: Chester
State or Province: CA
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: SEA3PO
Photos: SEA3PO
PostPosted: Mon Oct 15, 2007 3:50 pm    Post subject: Reply with quote
Amazing !!!! I pulled the cover and started the motors.....they run fine at high speed....but both motors shake when they idle.....
I took it to Pacific Marine in Oxnard for that problem.....about a year ago...they said they tuned it and it was fine.... they coulden't find anything wrong with it..... well Dah !! I just wonder how they adjusted the carbs without pulling the plugs over the adjustment screws.... it idled fine when it was new....but now that it has almost 300 hours on it...the carbs need to be adjusted.... they sure diden't have any problems charging me $300 for a tune up ......other than changing the oil and filter and the plugs...I wonder what they did ??? not much..
I just know that if I take it back they will tell me that my carbs need to be rebuilt...... nope...just pull the plugs and adjust the carbs...easy enough..

I really feel they cheated me.

Joel
SEA3PO
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SEA3PO



Joined: 02 Nov 2003
Posts: 1835
City/Region: Chester
State or Province: CA
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: SEA3PO
Photos: SEA3PO
PostPosted: Mon Oct 15, 2007 5:42 pm    Post subject: Reply with quote
That was it...... once I pulled those plugs and adjusted the needles it idles just fine..... got the shake down to a minimum....and the motors start a whole lot better too... Sure makes me think about repair shops..

Joel
SEA3PO
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tsturm



Joined: 01 Nov 2003
Posts: 1165
City/Region: Soldotna
State or Province: AK
C-Dory Year: 2003
C-Dory Model: 25 Cruiser
Vessel Name: JMR TOO
Photos: JMR-TOO
PostPosted: Mon Oct 15, 2007 6:49 pm    Post subject: Reply with quote
SEA3PO wrote:
That was it...... once I pulled those plugs and adjusted the needles it idles just fine..... got the shake down to a minimum....and the motors start a whole lot better too... Sure makes me think about repair shops..

Joel
SEA3PO


They aren't all like that Wink
Glad you got it handled! Mr. Green Beer
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