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Author Topic: Project "walrus" Yam XS 750  (Read 35176 times)

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #420 on: Aug 23, 2017, 13:06:52 »
So guys just made a crank plastigauge measurement...
Am I completely out of whack here? :-(

The two outer measurements were around .050 and the two inner ones around .063....



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Offline XS750AU

  • Posts: 318
Re: Project "walrus" Yam XS 750
« Reply #421 on: Aug 23, 2017, 19:31:26 »
Quote
Do you guys think also that I will need to remove the selector cams?

Yes, take everything out. I was like you and very nervous about tearing the transmission down. Especially as the casings were going to be away for a few weeks being blasted. But I kept the major assemblies bagged together, and it all went back together logically without any issues.
Hydroblasting was developed to clean up the turbine blades on jet engines. It does not actually remove any metal in the right hands, but it does create a smooth "crust" on the castings with a satin finish. Once done, it does not need any other treatment. Have a read of the following website and then decide what you do.

[url][/http://www.woodyshydroblast.com/url]

Guess we are lucky down under as there are 3 shops in Melbourne that use this process. There must be someone in Germany or nearby, but I cannot find any on Google!!!!
“Engineering is the art of being approximately right rather than exactly wrong.”

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

Offline der_nanno

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Re: Project "walrus" Yam XS 750
« Reply #422 on: Aug 24, 2017, 05:51:54 »
Regarding getting the transmission in and out: That's fairly easy and if you need help, you know who to ask.

And with regards to Plastigauge, we haven't read the instructions, have we?  ;) Plastigauge is used on DRY bearing surfaces, you're measuring such close tolerances, that the oil will affect the outcome of the measurement. And yes, I told you: Your crank is on the upper end of the spec (or slightly beyond) and the cases most likely as well. Use some thicker oil would be my professional advice or go all in, have it reground and then spec the bearing shells correctly. (But to be fair, I'd personally go with slightly bigger tolerances...)
Real freedom starts with the freedom of thought.

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

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 datadavid

  • Posts: 1139
Re: Project "walrus" Yam XS 750
« Reply #423 on: Aug 24, 2017, 08:37:58 »
Regarding getting the transmission in and out: That's fairly easy and if you need help, you know who to ask.

And with regards to Plastigauge, we haven't read the instructions, have we?  ;) Plastigauge is used on DRY bearing surfaces, you're measuring such close tolerances, that the oil will affect the outcome of the measurement. And yes, I told you: Your crank is on the upper end of the spec (or slightly beyond) and the cases most likely as well. Use some thicker oil would be my professional advice or go all in, have it reground and then spec the bearing shells correctly. (But to be fair, I'd personally go with slightly bigger tolerances...)
If that was done with oiled bearing surfaces, i would not be surprised if the clearance will be even bigger when measured dry.. i would not put it back together like that. Maybe measure ovality on crank and rods, and go to one or two sizes thicker bearings if all is round. I have a bunch of main bearings but no rod bearings lying around, mine all checked out around .03-.04 which will give a lot longer service life of the engine.

Offline Ryan Stecken

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Re: Project "walrus" Yam XS 750
« Reply #424 on: Sep 04, 2017, 04:44:34 »
Hey guys!

Had a good weekend with a bit of progress, need to be a bit careful again, my foot still hurts (had a climbing accident while back).

I think I made a decision. I will put my Cafe Racer project on the back burner and will use the parts, gaskets and eveything else to "Hot Rod" and work on my running stock XS 750...it just makes more sense to invest time energy and money in my running XS.
My plan is to ride the XS from Barcelona to Biarritz to next years Wheels and Waves and this is only doable if I go down the route I just talked about.
Just too many unsure things with the Cafe Racer.

I will extract the motor this winter and do a top-end service and prolly replace the head with the later model one.

I have a question for you guy:

Will this XS750 Tank fit my 1T5 frame,I´m kinda in love with the round shape...

Thanks in advance!

Offline der_nanno

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Re: Project "walrus" Yam XS 750
« Reply #425 on: Sep 04, 2017, 04:58:18 »
Yuuuuup, will fit. But I recall it's a bit shorter than stock, if this is the XS750SE tank.

Btw.: I have carbs for you, if you're feeling... manly.  8)
Real freedom starts with the freedom of thought.

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

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

  • Posts: 318
Re: Project "walrus" Yam XS 750
« Reply #426 on: Sep 04, 2017, 05:51:57 »
Quote
Will this XS750 Tank fit my 1T5 frame,I´m kinda in love with the round shape...

Ryan, my XS896 went the other way. I was putting a standard tank on a special frame. It did not just bolt on. The spacing for the front rubber mounts was too wide ( the mounting studs were longer) and interfered with the tank. It was easy for me to fix with a hacksaw, but for you going the other way may mean you have to add spacers.
As Nanno said then the length from the front mounts to the rear bolt is longer on the special tank, you will need to cut out the back mount and relocate it. You can do it, just needs work.
“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 #427 on: Sep 04, 2017, 05:53:21 »
Ryan, my XS896 went the other way. I was putting a standard tank on a special frame. It did not just bolt on. The spacing for the front rubber mounts was too wide ( the mounting studs were longer) and interfered with the tank. It was easy for me to fix with a hacksaw, but for you going the other way may mean you have to add spacers.
As Nanno said then the length from the front mounts to the rear bolt is longer on the special tank, you will need to cut out the back mount and relocate it. You can do it, just needs work.

Fiddling with the mounts is no problem but my concern was the tank tunnel which is strangely wide on the XS 750 tanks....

thanks!

Offline der_nanno

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Re: Project "walrus" Yam XS 750
« Reply #428 on: Sep 04, 2017, 06:17:35 »
The spine is the same, but the mounts are in different spots.
Real freedom starts with the freedom of thought.

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

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 dannywrx88

  • Posts: 111
Re: Project "walrus" Yam XS 750
« Reply #429 on: Sep 07, 2017, 08:05:09 »
Whats the original tank look like


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