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Author Topic: Project "walrus" Yam XS 750  (Read 44808 times)

Offline XS750AU

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Re: Project "walrus" Yam XS 750
« Reply #110 on: Aug 31, 2016, 07:49:50 »
Hi Ryan
Your video shows exactly the same sort of readings I was getting with a non working charging system and a spent battery. A healthy battery should be much closer to 13 volts. My bike would start and run though, but very rough as it was dropping spark on cylinder #1.
Assume you have fitted the new carbi boots and the are no vaccum leaks? The vacuum ports for the petcocks and the centre cylinder are blocked. In my excitement I have sometimes forgotten to block the vacuum ports!
With your spark, if 2/3 cylinders have spark and share the CDI unit then I would investigate the components unique to the cylinder without spark, starting from the plug and working back.
Good luck
Tim
“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
Yamaha XS896
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Offline der_nanno

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Re: Project "walrus" Yam XS 750
« Reply #111 on: Aug 31, 2016, 07:54:10 »
White wires are the three phases of the alternator. Doesn't matter, which goes where.
Real freedom starts with the freedom of thought.

My Blog:
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http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
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Offline Ryan Stecken

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Project "walrus" Yam XS 750
« Reply #112 on: Sep 01, 2016, 16:06:46 »
Its aaaaliiiiive!!

Had some time today to investigate.
Unscrewed the sparck plug cable at cylinder 1 took 2cm of and reassembled....i got spark...then put the tank back on started that damn thing :-)
It runs really rough.i need to fas it to keep it alive,no idle,in the beginning only cyl 3 got hot the other ones were cold...got a little brake cleaner into 1 and 2 and got them running too...
I used the 'old' battery (already have a new one charging).
Cold 12.4 volts,starting it went down to 11 volts when I revved the engine it got up again to 12.2...thats not enough?
could the dead battery cause this bad idling issue?

Really intense popping from the exhaust and carbs (no air filterd yet).

Will post a video tomorrow!

   

Offline XS750AU

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Re: Project "walrus" Yam XS 750
« Reply #113 on: Sep 01, 2016, 18:29:51 »
Well done.
Definately not charging, and the low battery can affect the running. Try tomorrow with new battery. You need to test the alternator coils with your multimeter to see if OK.
Popping could be air leaks on carbi side. Sounds like carbies need cleaning with carbi cleaner NOT brake cleaner.
Major step ahead, well done.
Cheers
Tim

Sent from my GT-I9506 using Tapatalk

“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
Yamaha XS896
Husaberg FE550
Yamaha TT250
Yamaha IT200N

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #114 on: Sep 02, 2016, 04:11:12 »
Well done.
Definately not charging, and the low battery can affect the running. Try tomorrow with new battery. You need to test the alternator coils with your multimeter to see if OK.
Popping could be air leaks on carbi side. Sounds like carbies need cleaning with carbi cleaner NOT brake cleaner.
Major step ahead, well done.
Cheers
Tim

Sent from my GT-I9506 using Tapatalk

Here are three videos showing my efforts to start the lady.I tried tried to adjust the mixture screws (from Video 1 to Video 3 i´m going in with the screw,cuz it was popping like crazy, thought it was getting too much gas).






Offline XS750AU

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Re: Project "walrus" Yam XS 750
« Reply #115 on: Sep 02, 2016, 04:17:23 »
Screws should be around 2.5 out. If they are, then it is something else. Can you post a photo of the carbies looking from the top towards the cylinders, include the boots and cylinder in shot.
Tim

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“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
Yamaha XS896
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Yamaha TT250
Yamaha IT200N

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #116 on: Sep 02, 2016, 04:21:40 »
Screws should be around 2.5 out. If they are, then it is something else. Can you post a photo of the carbies looking from the top towards the cylinders, include the boots and cylinder in shot.
Tim

Sent from my GT-I9506 using Tapatalk

thanks!will do when I´m back on the bike!

The middle carb boot inlet is blocked with a rubber thing, boot of Cylinder number 1 and 3 have a hose going to the petcock.
When I will run pods I guess I will need to block all 3 of these dont I?

Offline XS750AU

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Re: Project "walrus" Yam XS 750
« Reply #117 on: Sep 02, 2016, 04:32:53 »
Yes that answers my question. Just make sure the hoses are not leaking.
Could not hear the videos too well as I am out on date night.

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“Engineering is the art of being approximately right rather than exactly wrong.”

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Offline der_nanno

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Re: Project "walrus" Yam XS 750
« Reply #118 on: Sep 02, 2016, 17:04:48 »
In all honesty: Fit the airbox or at least pods. CV-carbs require a bit of calm air around the slides.
Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211

Offline XS750AU

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Re: Project "walrus" Yam XS 750
« Reply #119 on: Sep 02, 2016, 20:01:49 »
Yes agree with Nano about getting the pods or airbox on.
It does sound like it is lean and  when you open the throttle it dies rather than accelerate. That means the fuel is not getting  through. Clean clean clean those carbies with carbi cleaner.  You must be able to see through all the jets. Check that the diaphragms are OK and the slides are raising and lowering.
Cheers
Tim
“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
Yamaha XS896
Husaberg FE550
Yamaha TT250
Yamaha IT200N