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Author Topic: XS750 to XS896 big bore  (Read 47180 times)

Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #90 on: Aug 24, 2016, 19:23:15 »
The theory wad that the leaking petcocks diluted the engine oil and contributed to the big end failures. I have been using the standard petcocks on the 750 for 5 years without problems. The current rebuild kits appear to be robust. Plus it nice to have original spec. Means one more kick for cold starts though!


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

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

Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #91 on: Aug 28, 2016, 08:01:27 »
No progress this weekend as I was down in the country.
I did find some inspiration though. After coming across the images of the bike below, I have decided that with my leading axle forks, it does look more dirt bike than cafe, so a scrambler it will be. Hopefully it will look half as good as this one by Bunker Brothers in Turkey.
I did put new carbi boots on an old TT250 I have down the farm for my son to ride. The new boots have transformed it from an mongrel to an absolute gem to start. Just shows how critical air leaks are on the induction side. Plus of course I had some real fun on the Husaberg - love that bike. 
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 XS750AU

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Re: XS750 to XS896 big bore
« Reply #92 on: Sep 04, 2016, 06:44:35 »
Not that productive this weekend.
Painted the barrels of the 896 black, as a contrast to the rest of the motor. Also retrieved all the calipers to strip down and clean. Went to strip out the swing arm from the frame. but I need to get a 28mm socket to undo the pivot nuts.
On the XS750 I made up a manometer to balance the carbies. Thought I had stuffed them up, but it turned out that even though there was fuel in my temporary tank, the fuel was not feeding through under a certain level!!!! Doh!!!!!!!
All good now. The manometer was made using $6 of aquarium air hose and one T piece plus some old sump oil (for colour!!). Very very sensitive to minor adjustments. As it is a closed loop system it is really just measuring the vacuum differential between each carbi at idle. 1/8th of a turn on the balance screw makes approximately a 200mm difference. As it is in the video that was the best I could get, the slightest movement of one balance screw gave a 100mm movement.

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 Tune-A-Fish©

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Re: XS750 to XS896 big bore
« Reply #93 on: Sep 04, 2016, 08:23:55 »
Sweet Macgyver Mano Meter Mang  :o
"I didn't come here and I ain't leavin"  Willie Nelson

"love hard, live fast, die fun" Kacey Musgraves

"Like a Wreckin Ball!" Eric Church

Offline Psycrow

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Re: XS750 to XS896 big bore
« Reply #94 on: Sep 04, 2016, 16:22:52 »
No progress this weekend as I was down in the country.
I did find some inspiration though. After coming across the images of the bike below, I have decided that with my leading axle forks, it does look more dirt bike than cafe, so a scrambler it will be. Hopefully it will look half as good as this one by Bunker Brothers in Turkey.
I did put new carbi boots on an old TT250 I have down the farm for my son to ride. The new boots have transformed it from an mongrel to an absolute gem to start. Just shows how critical air leaks are on the induction side. Plus of course I had some real fun on the Husaberg - love that bike. 
Cheers
Tim
The leading edge forks gave me the exact same feeling. So I raised the rear end  1 1/4" with longer shocks to make the tank / frame line parallel with the ground and improve ground clearence. Mine will not be a show bike... it will see gravel roads ;)

Psy

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Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #95 on: Sep 04, 2016, 19:06:37 »
Psy
That was my thinking also. Do you have any photos to share?
Tim

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

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

Offline Psycrow

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Re: XS750 to XS896 big bore
« Reply #96 on: Sep 04, 2016, 22:27:56 »
I have a build thread here in the Projects/trackers section but for convience here is one as she sits now... have some electrical issues to sort ( no tail light but brake light works!?!?! and the blinkers are not blinking) leaking petcock, and I should change the fork oil but I havent figured out how to remove these funky fork caps. Tank will see some black highlights of some sort and the front fender needs chopped and painted. I havent gone full resto or mod because this will see action I left the plastic section of the rear mud guard for example because it will see rain and mud, battery box is staying for now. havent decided on which knobbies to order for it yet.. there is not a lot of room in the back thanks to the narrow swing arm.


Psy


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Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #97 on: Sep 04, 2016, 23:11:18 »
Thanks for the photo.
To remove the fork cap, you have to push the adjuster cap down 1 to 2 mm. There is a 1mm wire clip sitting in a groove that you then have to dig out with a small blade screw driver. Once the clip is out, the adjuster cap and spring will all come out the top. If you want to remove the damper rod, there is a cap screw down the bottom of the fork that you need to undo (good idea to undo before releasing spring tension).
They are pretty easy to work on. They do suck dirt and crap in, so it is worth the effort to pull them appart and clean.
Cheers
Tim

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

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

Offline Psycrow

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Re: XS750 to XS896 big bore
« Reply #98 on: Sep 05, 2016, 00:35:46 »
Thanks for the info.. thats what i figured.. mine are missing the caps and are pretty corroded so i cant see the retaining clip... i just need to take some time and go at them... other stuff to do for the time bieng... ill tackle them when the new front tire comes in... gotta install my gators too ;)

Psy

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Offline XS750AU

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Re: XS750 to XS896 big bore
« Reply #99 on: Sep 05, 2016, 22:12:05 »
Hi Psy
One of your earlier photos really shows the change in stance with the 365mm shocks. Almost looks like a dirt bike. One point about the Thruxton shocks, even though they are longer they only have 60mm of travel. That damper tube is bloody long! Think I will go for a set of 365mm long with 90mm of travel.
Forks arrived from straightening and chroming. It costs AU $400 to get done, what does it cost where you guys are?
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