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Old 11-03-2009, 03:00 AM   #1 (permalink)
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Frito's 1970 T100R rebuild

I guess I will start a thread about the rebuild of my T100R. I looked at Ed's website and it freaked me out a little bit. First, a picture of the original bike:



Now a little history. I actually have not ridden a motorcycle much. I started with a 1965 Vespa and had that for about 5 years before it got stolen. My (now) wife bought this Daytona when she was living in Detroit. Bike was in Maryland and she trailered it up to Detroit where it sat outside for 3 years. I should point out that it ran when she bought it. We shipped it out here to Seattle and it sat outside here for about a year before I decided to see if we could start it. Seemed like it wanted to turn over, but eventually the kick start gear snapped. I took it to this shop out here that specialized more in newer bikes but the guy said he was interested in working on some vintage british bikes and he came recommended. Since he didn't have ready parts or know where to get them and his newer bikes did, mine sat unattended and taken apart for over 6 months. I finally had it towed back home with a couple boxes of pieces which included the gear box and other stuff.

I decided I was going to bring this bike back to life. Up until this point (February 2009), I had fairly limited mechanical experience working a bit on my vespa and some basic work on my old 1965 Volvo (twin amal carbs, baby!!). I got some books (British Only parts manual, Hays, Triumph Restoration book of some sort my wife bought) and jumped in. I've been taking things apart completely down to the bolts and tagging all the parts and ordering new parts that need replacing - started with the gearbox and am now onto the engine compartment.

The entire thing is in my basement since I don't have a garage. Engine shares space with my homebrew equipment and the frame is snug between the water heater and the furnace. Here are some more pictures...

Water in the gearbox:


Gears:



Not so happy gears:


Pistons:



cylinder head:


One thing I guess I would like to ask, if anyone's read this far, is whether I can salvage the cylinder head. You can't really see from the photo above, but on the right side (the orange, rusty side) on the inner and outer parts of the cylinder head where the pistons are seated (sorry, don't know the proper name) there are divets of some sort in the metal. I don't believe this was caused by rust. I'm just wondering if they can be machined out or whether I will need a new cylinder head. Obviously, I would rather not drop that kind of coin if I can avoid it.

Alright, that's it. I started this in February of this year and haven't been super vigilant about working on it during the summer.
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Old 11-03-2009, 10:19 AM   #2 (permalink)
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Set your camera to "macro" lens mode and snap a close-up of the bad side of the head and post it up.

It can probably be rebuilt, but may end up running slightly different from the other cylinder (not that big of an issue on a low compression engine).

I swear I've seen pix of that bike before, the paint job is unforgettable.

Welcome to the forum.
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Old 11-03-2009, 11:23 AM   #3 (permalink)
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Here are a couple close-ups. Hadn't thought about macro! thanks.



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Old 11-03-2009, 11:48 AM   #4 (permalink)
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I defer to GrandPaulz's greater experience in rebuilding old twins, but those look like marks from the stem of a broken valve. I doubt that they are going to require a replacement head. If it was mine, I would strip the head (i.e. remove the valves, pushrod tubes, etc. from the casting) and have it bead blasted with glass or plastic media. That would remove the rust and let you see what you have. Note: bead blasting will require a new valve job, but that seems mandatory anyway.

Good luck and welcome to the forum.
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Old 11-03-2009, 04:00 PM   #5 (permalink)
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That's a coin toss left only to your machinist, with Triumph factory specs for valves & valve seat in hand.

The dimpling can probably be smoothed out satisfactorily, but the valve seats give me pause...

Your machinist ought to be familiar with classic Triumphs or at least VERY familiar with motorcycles. If not, find one that is, and preferrably comes recommended as such.
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Old 11-03-2009, 04:02 PM   #6 (permalink)
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Looking back, the photos of the pistons don't show the assumed damage from what was thought to be broken valve bits. May be good news.

Check with the machinist.
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