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Author Topic: Project "walrus" Yam XS 750  (Read 32432 times)

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #20 on: Aug 03, 2016, 09:33:37 »
Here are some pics...carb tops say mikuni...hope that those mkII's....
Edit:looks like they are generation 1 mikunis.
« Last Edit: Aug 03, 2016, 10:22:44 by Ryan Stecken »

Offline datadavid

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Re: Project "walrus" Yam XS 750
« Reply #21 on: Aug 03, 2016, 19:58:36 »
Those are mk1

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #22 on: Aug 04, 2016, 02:35:53 »
Should i throw them too into the bin :-)?

Just found that....
Will these fit my XS?what will I need to modify to fit these?
« Last Edit: Aug 04, 2016, 02:38:01 by Ryan Stecken »

Offline XS750AU

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Re: Project "walrus" Yam XS 750
« Reply #23 on: Aug 04, 2016, 07:15:14 »
Yep Mk1
A lot cheaper to clean and new mounting rubbers than spend Euro199!
You are going to need new mounting rubbers no matter what carbi you have on it. I my humble opinion get the mounting rubbers and see how it runs. You are going to need to rejet the Triumph carbies before you even get started!!!
“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 #24 on: Aug 04, 2016, 15:16:16 »
Thanks tim!

Just finished cleaning my mk1 carbs lets see what they will do...i will set the mixture screws to 1 1/2 turns out for starters.

Just figured today that i have mk2 carbs on my parts bike...when i opened the carbs they were nice and clean but two posts where the floats are fixed were broken off...so i guess they are paperweights now.


Offline XS750AU

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Re: Project "walrus" Yam XS 750
« Reply #25 on: Aug 04, 2016, 23:31:35 »
What a shit!!!
The PO must of used a hammer to get the float pins out!
From the repair  manual, for carbs with 145 main and 17.5 pilot the float height should be 26.6mm and pilot air screws at 2 1/4. Does it have an aircleaner? Should start though but if the mounting boots are buggered and you don't have an aircleaner it is going to be lean.
Good luck
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 datadavid

  • Posts: 1100
Re: Project "walrus" Yam XS 750
« Reply #26 on: Aug 05, 2016, 13:32:12 »
Yep Mk1
A lot cheaper to clean and new mounting rubbers than spend Euro199!
You are going to need new mounting rubbers no matter what carbi you have on it. I my humble opinion get the mounting rubbers and see how it runs. You are going to need to rejet the Triumph carbies before you even get started!!!
The bike runs so much smoother and better with those carbs, i believe its a justified investment. I also think the daytonas power figures are resembling the xs, a bit higher of course. May just need a different main and 1 needle shim.

Thanks tim!

Just finished cleaning my mk1 carbs lets see what they will do...i will set the mixture screws to 1 1/2 turns out for starters.

Just figured today that i have mk2 carbs on my parts bike...when i opened the carbs they were nice and clean but two posts where the floats are fixed were broken off...so i guess they are paperweights now.

I welded up a float post i broke on my ladys xs1100, they break too easy even if you do it the right way. Was good as new afterwards though, you cant even see its been broken. Kintsukuroi as the japanese say.

Offline XS750AU

  • Posts: 290
Re: Project "walrus" Yam XS 750
« Reply #27 on: Aug 06, 2016, 04:55:14 »
If you can find someone to weld them for not much, then they would be great. If they want to charge shop rates then might be better getting the Triumph carbies.
Just check that the pitch and mounting boss on the engine side matches the mounting rubber boot internal diameter on the triumph carbies.
I am using a triumph 1050 header on the 896 and the pitch was perfect, but the head interface needs work to make it fit. The triumph carbies Dave used were a simple fitment. Was that correct Dave?
It should run OK on the Mk 1 carbies, at least to see if the rest is OK.
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

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #28 on: Aug 09, 2016, 13:25:07 »
Hey guys...so today i tried to start the xs with the freshly cleaned carbies (mikuni 1).
Checked for spark and cylinder 1 has no spark,cyl 2 weak spark and cyl 3 strong spark.
It kinda ran on 2 cyl but only when I was holding onto the throttle.
The PO told me that the regulator unit might be shot,could this cause this issue?
Could it be some shot coils?

Red white and orange goes to the coil i checked for continuity to the ignition box the cables are fine.
Checked for volts coming out of the box...no volts on red white and orange.shot ignition box?

I also opened the oil cap of the motor and tried to move the main chain and I could move it up all the way to the motor lid...looks like theres a lot to do on that thing...




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« Last Edit: Aug 09, 2016, 13:30:44 by Ryan Stecken »

Offline Mi3ninos

  • Posts: 4
Re: Project "walrus" Yam XS 750
« Reply #29 on: Aug 09, 2016, 15:00:57 »
float posts can be repaired fairly easily.

http://www.yamaha-triples.org/workshop/Mikuni_MKII_Post_Repair.pdf

another common problem with the MKII is the air pilot screws often break at the tips. no replacements and the tip often breaks deep.

 as recommended prior 2.25 turns out is a good start and make triple sure the passages are clear. mine starts best at 2.75 turns out but runs and synchs  best at 2.5
« Last Edit: Aug 09, 2016, 15:09:13 by Mi3ninos »