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Mitch's 74 Basket Case

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Mitch's 74 Basket Case

Postby htown16 » Sat Dec 12, 2015 10:34 am

Decided to do a build thread on my 74 850 rebuild like I did on my 72. Here's a link to that one.
mitch-basket-case-t4616.html
Bought this one about a year and half ago and have been plugging away at since then.
This was the what was included in the initial purchase. Frame, bottom end, cylinders and pistons, gearbox and several boxes of parts including oil tank and some other bits. All matching numbers.
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First item was to locate a cylinder head. Baxter's had one and I had them go ahead and do a rebuild on it before sending it to me.
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I raided my parts bins and did a mock up. Fortunately, I had all this stuff from my parts scrounging over the years.
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The black tank in the above picture is a fiberglass junker. I had a repop steel tank and painted it in Duplicolor metalspecks blue with Spraymax 2K clearcoat. Came out looking pretty good for a spray bomb job.
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More to follow
Htown16
Magnolia, TX
1970 BSA Thunderbolt
1971 Commando
1972 Commando
1974 Commando
1978 T140E Bonneville
1974 Trident
2004 XL1200R Sportster
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Re: Mitch's 74 Basket Case

Postby Paddy_SP » Sat Dec 12, 2015 3:35 pm

Excellent - I look forward to seeing more pics! :)

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Re: Mitch's 74 Basket Case

Postby MS850 » Sat Dec 12, 2015 4:37 pm

Like to see projects start to finish. Im watching you, hehehe
Thanks,
Mark
Roseville, Ca

1975 850 Interstate
1974 Yamaha MX250
1973 Honda CB500
'07 650 Vstrom
'63 McLane Lawn Edger
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Re: Mitch's 74 Basket Case

Postby Torontonian » Sat Dec 12, 2015 9:38 pm

Keep a' goin'.
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Re: Mitch's 74 Basket Case

Postby htown16 » Sun Dec 13, 2015 11:38 am

Engine coming apart.
Cylinders were in decent shape. Standard bore and even showing some crosshatching. Evidence is pointing to this being a low milage engine with a long storage in a damp climate. There was some evidence of rust where the piston rings had sat. Note the broken fin. Someone had probably tried to pry the head off. I found a guy that welds cast iron industrial pieces and he brazed it back on for me. Was into motorcycles and didn't even charge me.
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Pistons were in good shape no scuffing. However this piston had one of the compression rings that was absolutely stuck in it. No amount of soaking or heat would break it loose. Since I was probably going to damage the piston getting it out I decided to go with new pistons +.20 and clean up the rust damage in the cylinder walls. Got in a new set of JCC/Cyclecraft with Hastings rings. They're what I used in my 750 and have so far worked out well.
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Damage on end of cam due to moisture in points cavity. I'm going to attempt to repair this with a Speedi-sleeve as the cam is otherwise in excellent shape.
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Here's the bottom end coming apart. The crank worm-drive and cam nut were absolute pains. I had to get some impact sockets from the UK and use my impact wrench on them along with heat and penetrating oil. Even then I had to let the wrench hammer on them a while. The cam nut will need replaced. Thankfully a member on here loaned me a cut away timing cover so the pinion shaft is still tight. The cam gear needed a puller to come off but the crank pinion gear pulled off by hand with no puller, go figure. The cases also were a bear to split. Took a lot of pounding with a wood block and hammer but they finally parted with no damage.
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More to come.
Htown16
Magnolia, TX
1970 BSA Thunderbolt
1971 Commando
1972 Commando
1974 Commando
1978 T140E Bonneville
1974 Trident
2004 XL1200R Sportster
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Re: Mitch's 74 Basket Case

Postby grandpaul » Sun Dec 13, 2015 2:38 pm

That series of cases are the easiest to install a reed valve on, right where that pipe is at the back of the timing cover. Tap two holes for mounting, and one for the breather, and screw it on from the outside.
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Re: Mitch's 74 Basket Case

Postby htown16 » Sun Dec 13, 2015 3:08 pm

Yep, definitely a reed valve. Have the Mike's XS 650 type on my 750 and it has minimal leaks.
Htown16
Magnolia, TX
1970 BSA Thunderbolt
1971 Commando
1972 Commando
1974 Commando
1978 T140E Bonneville
1974 Trident
2004 XL1200R Sportster
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Re: Mitch's 74 Basket Case

Postby htown16 » Wed Dec 16, 2015 5:44 pm

Cam lobes look good with minimal wear, lifters also looked good. If I can repair the damage done in the seal area the cam should be good to go.
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Flywheel had some rust on it, like water had sat in the bottom of the crankcase. Fortunately it was below the level of any machined surfaces and did only surface damage. The main bearings, which are Superblends were also apparently above the water and had enough oil on them that they look pristine. New crank hardware on order.
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Crankshaft cheeks also have some surface rust but journals look in really good shape. Very little sludge in the trap.
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Timing side journal
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Drive side journal
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Big End bearing show minimal wear. Again I think this is a low mile engine. Crank journals mic out to right on standard spec with no ovality.
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I was tempted to put these bearing back in but have a new standard set on order. Hope I never have to split the cases again.
Htown16
Magnolia, TX
1970 BSA Thunderbolt
1971 Commando
1972 Commando
1974 Commando
1978 T140E Bonneville
1974 Trident
2004 XL1200R Sportster
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Re: Mitch's 74 Basket Case

Postby grandpaul » Thu Dec 17, 2015 8:08 am

Same with me on the JPS rod bearing shells- they looked new, but they're getting new ones anyway.

Yours is looking very nice and clean. I also have the same issue with surface rust on the bottom of the flywheel.
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Re: Mitch's 74 Basket Case

Postby ashman » Thu Dec 17, 2015 2:45 pm

Anytime the rods are pulled apart the slipper bearings should be replaced wheather they need it or not in my opinion, they aren't that expensive and knowing that they are new.

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Re: Mitch's 74 Basket Case

Postby grandpaul » Thu Dec 17, 2015 3:16 pm

ashman wrote:Anytime the rods are pulled apart the slipper bearings should be replaced wheather they need it or not in my opinion, they aren't that expensive and knowing that they are new.


I sure haven't figured out why they cost twice as much as almost identical bits for Triumph big twins...
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Re: Mitch's 74 Basket Case

Postby htown16 » Thu Dec 17, 2015 5:02 pm

The flywheel was before I took a wire brush to it. It looks a lot better now.
Htown16
Magnolia, TX
1970 BSA Thunderbolt
1971 Commando
1972 Commando
1974 Commando
1978 T140E Bonneville
1974 Trident
2004 XL1200R Sportster
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Re: Mitch's 74 Basket Case

Postby htown16 » Wed Jan 20, 2016 10:34 am

With the holidays over, I finally have gotten some shop time in.
Crank back together with new Andover hardware.
Image
Rods back on with new standard bearings.
Image
Htown16
Magnolia, TX
1970 BSA Thunderbolt
1971 Commando
1972 Commando
1974 Commando
1978 T140E Bonneville
1974 Trident
2004 XL1200R Sportster
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Re: Mitch's 74 Basket Case

Postby htown16 » Wed Jan 20, 2016 10:49 am

Cam had some rust damage. I measured where the seal runs on another engine and it is .15" out from the end of the threads. You can faintly make out the track of the seal. Fortunately most of the damage is beyound that. I filled the damage with some JB Weld Steelstik. The cam lobes look pristine so it's going back in.
Image
Last edited by htown16 on Wed Jan 20, 2016 11:06 am, edited 2 times in total.
Htown16
Magnolia, TX
1970 BSA Thunderbolt
1971 Commando
1972 Commando
1974 Commando
1978 T140E Bonneville
1974 Trident
2004 XL1200R Sportster
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Re: Mitch's 74 Basket Case

Postby Paddy_SP » Wed Jan 20, 2016 10:50 am

Excellent - I'm at a similar stage with my 850 - just waiting for the cam to come back from being reground. I do most other stuff myself, so the wait is killing me!

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