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power valve servo

 
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Chris F



Joined: 19 Oct 2012
Posts: 78
Location: Cornwall

PostPosted: Thu Sep 18, 2014 2:49 pm    Post subject: power valve servo Reply with quote

yet more woes...
got the pins for the valve working now and cables arrived etc etc
but something didn't seem right.
so I took the servo motor apart to find 2 cogs missing teeth and lots of hardened up oil/grease in there.
I can see it's a Yamaha servo but I don't know what off.
anyone any ideas?
Mine as 73R on the top with 4FM-00 underneath.
No idea what it means as it doesn't appear to be a part no.
Cheers,
Chris
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Chris F



Joined: 19 Oct 2012
Posts: 78
Location: Cornwall

PostPosted: Thu Sep 18, 2014 3:31 pm    Post subject: Reply with quote

ok did a bit of digging and looks like it is off either a:

YZF 600 RF
or
YZF 750 RF

not sure if the year matter that much though....
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trev45



Joined: 15 Jun 2011
Posts: 449
Location: Sydney Australia

PostPosted: Thu Sep 18, 2014 10:43 pm    Post subject: Reply with quote

This Yamaha 4FM-85820-00-00 SERVOMOTOR ASY part is also used on these models and components:

1994 YZF750RF ELECTRICAL 1
1994 YZF750RFC (CA ED.) ELECTRICAL 1
1996 YZF750RH ELECTRICAL 1
1996 YZF750RHC (CA ED.) ELECTRICAL 1
1997 YZF1000RJ ELECTRICAL 1
1997 YZF1000RJC (CA ED.) ELECTRICAL 1
1997 YZF750 - YZF750RJ ELECTRICAL 1
1997 YZF750 - YZF750RJC ELECTRICAL 1
1998 YFZ50RK ELECTRICAL 1
1998 YZF750 - YZF750RK ELECTRICAL 1
1998 YZF750 - YZF750RKC ELECTRICAL 1
1998 YZFR1 - YZF1000RK ELECTRICAL 1
1998 YZFR1 - YZF1000RKC ELECTRICAL 1
1998 YZFR1 - YZFR1K ELECTRICAL 1
1998 YZFR1KC ELECTRICAL 1
1999 YZFR1L (BLUISH WHITE COCKTAIL 1) ELECTRICAL 1
1999 YZFR1LC (BLUISH WHITE COCKTAIL 1) ELECTRICAL 1

Just need to change plug
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Chris F



Joined: 19 Oct 2012
Posts: 78
Location: Cornwall

PostPosted: Fri Sep 26, 2014 3:49 pm    Post subject: Reply with quote

trev45 wrote:
This Yamaha 4FM-85820-00-00 SERVOMOTOR ASY part is also used on these models and components:

1994 YZF750RF ELECTRICAL 1
1994 YZF750RFC (CA ED.) ELECTRICAL 1
1996 YZF750RH ELECTRICAL 1
1996 YZF750RHC (CA ED.) ELECTRICAL 1
1997 YZF1000RJ ELECTRICAL 1
1997 YZF1000RJC (CA ED.) ELECTRICAL 1
1997 YZF750 - YZF750RJ ELECTRICAL 1
1997 YZF750 - YZF750RJC ELECTRICAL 1
1998 YFZ50RK ELECTRICAL 1
1998 YZF750 - YZF750RK ELECTRICAL 1
1998 YZF750 - YZF750RKC ELECTRICAL 1
1998 YZFR1 - YZF1000RK ELECTRICAL 1
1998 YZFR1 - YZF1000RKC ELECTRICAL 1
1998 YZFR1 - YZFR1K ELECTRICAL 1
1998 YZFR1KC ELECTRICAL 1
1999 YZFR1L (BLUISH WHITE COCKTAIL 1) ELECTRICAL 1
1999 YZFR1LC (BLUISH WHITE COCKTAIL 1) ELECTRICAL 1

Just need to change plug


Thanks Trev. just needed the internals out of it (cogs) so was a simple straight swap. You know what, this bloody bike has never been right since day 1. Now I've straightened the bush, got new cables and changed over the knackered cogs it's runs the valve's perfectly... oh well, live and learn...
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SethG



Joined: 09 Aug 2014
Posts: 95

PostPosted: Sat Sep 27, 2014 8:44 pm    Post subject: Reply with quote

What caused you to decide to dig into that thing in the first place? Was it somehow obviously broken?
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Chris F



Joined: 19 Oct 2012
Posts: 78
Location: Cornwall

PostPosted: Sun Sep 28, 2014 11:38 am    Post subject: Reply with quote

Hi Seth,

A few things really. I had to run my bike in as it was pretty much new when I picked it up from Milan. Some where some weren't.

Once ran it it wouldn't fully rev so started looking around. 1st thing noticed was the powervalve on the lower cylinder had vibrated loose most of the top components of the PV assembly. Once fixed still no better. Noticed the top PV was sticking and my bike always made a clicking noise from the servo when adjusting. Didn't think much of it.
Next thing to go was the top PV snapped its very small locating needle pin.
So given this had a good luck at everthing.
PV pins/rods didn't run up and down freely. Incorrrectly aligned bush.
One cable from servo frayed. Took servo apart to see why it was clicking and 4 teeth missing of 2nd biggest cog and largest cog was warn.
Most likely all this was a knock effect of the sticking PV pin due to mis-alignment I guess. Now it's all much better. don't think it's that common. Seems someone not being that diligent when putting things back together most likely the culprit.
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