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Author Topic: Project "walrus" Yam XS 750  (Read 22053 times)

Offline Garc

  • Posts: 16
Re: Project "walrus" Yam XS 750
« Reply #45 on: Aug 10, 2016, 13:56:00 »
I personally ran up and down every harness with a multimeter and cleaned all connecting plugs with contact cleaner/small wire brush.  Tested all loads for static battery draw and verified all resistances of components.
The joys of a 35+ year old bike.  Nothing beats the sound of a triple though.

Good luck
XS 750/850 Triple Shaftjacker

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #46 on: Aug 11, 2016, 07:11:36 »
Does any of you guys have a coloured wiring diagram handy in high res?would like to print it out to fight ny electrical gremlins...i yesterday dug out a spare loom maybe I will need it :-)

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Offline datadavid

  • Posts: 1004
Re: Project "walrus" Yam XS 750
« Reply #47 on: Aug 11, 2016, 08:00:57 »
I have one for every model made in my manual, can send pics of your models tonight when i go by the garage.

Offline datadavid

  • Posts: 1004
Re: Project "walrus" Yam XS 750
« Reply #48 on: Aug 11, 2016, 08:03:32 »
Electrics probably just need a good cleaning - the connectors hanging on the left side of the battery box are usually subjected to battery acid early in the bikes life because of the vent tube there, so they will be corroded and not letting voltage through!
Did you try to hang a size 10 spanner on the alternator cover with ignition switched on yet? It should magnetize enough to hold the spanner.
Soon you will have a roaring triple!

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #49 on: Aug 11, 2016, 09:08:58 »
Thanks data!will do!
I'm new to the 4stroke world so I keep learning everyday.
Alternator is left hand side am I right?
Will this also apply with my XS 850 electronic ignition?

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Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #50 on: Aug 11, 2016, 09:09:29 »
I have one for every model made in my manual, can send pics of your models tonight when i go by the garage.
That would be great thanks!

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Offline datadavid

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Re: Project "walrus" Yam XS 750
« Reply #51 on: Aug 11, 2016, 09:13:09 »
Thanks data!will do!
I'm new to the 4stroke world so I keep learning everyday.
Alternator is left hand side am I right?
Will this also apply with my XS 850 electronic ignition?

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Alternator is right hand when sitting on the bike.
850's have same principle charging system, but i think they have unit construction reg/rec's.

Offline XS750AU

  • Posts: 176
Re: Project "walrus" Yam XS 750
« Reply #52 on: Aug 11, 2016, 09:20:32 »
Hi Ryan
When you sit on the bike, the alternator is on the right hand side and the ignition is on the left hand side.
The charging loom does not go up through the main harness. Four wires come out of the alternator and into the rectifier. Then the black and red out of the rectifier are your ground and positive.
The Yamaha Triples site has the manuals on line http://yamaha-triples.org/library/owners/xs7502d/default.asp
Regards
Tim

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #53 on: Aug 11, 2016, 09:21:08 »


Alright right hand side!

The PO installed the 850 ignition...I think the reg/rec is now a combo unit,it has two cable strings with plugs on it IIRC.

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Offline datadavid

  • Posts: 1004
Re: Project "walrus" Yam XS 750
« Reply #54 on: Aug 11, 2016, 12:09:00 »
no nice and bright colors unfortunately.. 😕 i can scan it for higher res if you have any use for it.

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #55 on: Aug 12, 2016, 04:28:33 »
no nice and bright colors unfortunately.. 😕 i can scan it for higher res if you have any use for it.
that would be really nice of you!

I will hopefully get on the bike tomorrow and try the things you said guys.Already bought new ignition cables and spark plugs.

Is there a sure way to test coils for function with a multimeter (i read something about measuring the ohm figure)?
« Last Edit: Aug 12, 2016, 04:31:25 by Ryan Stecken »

Offline XS750AU

  • Posts: 176
Re: Project "walrus" Yam XS 750
« Reply #56 on: Aug 12, 2016, 05:41:04 »
Hy Ryan
Not a pretty photo!!! Looks like the alternator cover has been off for a long time. There is not much that can go wrong with the rotor but there is a lot that can go wrong with the coils. In the alternator cover there are 2 separate coils. The inner coil is the energizer which works with the rotor to create the magnetic fields. The outer coil generates the AC voltage which goes to the regulator. You need to test wire to wire on both wires that go to the energizer coil and then there are 3 wires (from memory) that come from the generator coil, so you heed to test is 3 pairs of wires. For example W1 with W2, W3 with W1 and W2 with W3, if any of these are open circuit you have a problem. Use a multimeter on the lowest resistance scale. If 2 or more wires are open circuit then you need to fix them. The most likely point that they break is where they come out of the cover. Means you have to strip the insulation off at that point make the repair and then cover again with insulation heatshrink or tape.
Not fun, of the 3 alternators I have 2 needed repair at that point.
I have attached a PDF of the XS750-2D repair manual which I downloaded off the web for free - no copyright.
I have also attached a Mikuni carbi tuning guide which I have made up from copying a number of different documents and bloggs that made sense. I cannot claim any credit for the information.
Hope they help you.
Regards
Tim

Offline XS750AU

  • Posts: 176
Re: Project "walrus" Yam XS 750
« Reply #57 on: Aug 12, 2016, 06:46:30 »
Ryan
If you have a digital multimeter then there is usually a setting on ohms where if you put the 2 probes together it beeps, meaning a closed circuit. No beep means open circuit, which is bad!!!
Cheers
Tim

Offline XS750AU

  • Posts: 176
Re: Project "walrus" Yam XS 750
« Reply #58 on: Aug 12, 2016, 06:54:40 »
Ryan
The attached snip of the circuit diagram for the charging circuit. It shows you the colours of the wires you need to test.
Cheers
Tim


Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #59 on: Aug 12, 2016, 11:07:33 »
Thanks guys just got my first box with rubber carb boots...the new ones are a bit longer than the stock ones...will this cause any issues (ebay item for my bike model)?

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