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Old 07-08-2013, 03:34 AM   #76
motu
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I thought the timing end of the crank was supposed to be mushroomed over ? ...they all were in the '70's. That looks like a heavy crank; I think '61 was the lightest crank, and then they got heavier again. I used to be a light flywheel type, then I liked heavy, now I'm back to light...although that might just be an Airhead thing.

What are the books - engineering textbooks you'll never use again ? Or well read poetry?


I went to a twinshock trial yesterday...just for a look, get back some enthusiasm by saying the sections looked too easy. A TLR250 was there, and an even rarer RTL250, I need to get the TLR200 back in the mix. There was one TY175 - what a nice little machine they are. Slippery conditions, but he was having trouble keeping the front end down, something they tend to do.
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Old 07-12-2013, 04:04 PM   #77
trustme OP
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As requested



Cool little bike , great fun

The books are ' Arthur Mee's Childrens Encyclopedia ' ,[ google is your friend ]
Been kicking around the garage for years just don't have the heart to throw them out, sacrilege I guess to use them like that , they were handy.

Dry build to check the piston / valve clearance today , more pics to come.
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Old 07-13-2013, 01:36 PM   #78
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As requested
Thanks - looks like someone rebuilt it to compete in twin shock trials?
Tidy looking bike

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Dry build to check the piston / valve clearance today
so no drinking in the garage today
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Old 07-13-2013, 02:59 PM   #79
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Getting off topic with bikes that run

If you wanna take it up to the Sandpit, you can borrow my KDX200
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Old 07-14-2013, 12:49 AM   #80
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One step forward , one step back

Set up the barrel



Removed the outer valve springs



Fitted the head bolts



Then the head



Rocker boxes on & degree wheel set to check piston to valve clearances



Checked at TDC , - 10 & + 10 degrees all good ,80 to 120 thou which is what I was told to get, You set the tappets to running clearance then wind them in till till the valve hits the piston, one turn is 40 thou, high tech marker for the degree wheel but it works



Stripped it all back down to fit the rings & start on the final build.



Oil rings fit sweet as

2 x top rings will not fit . Looks like the rings are approx 0.2 mm too thick to fit the piston ring grooves.

Yet another email to Mr MAP

Will go to the local engine reco man who does a fair bit of performance work & Johnson Rings tomorrow to see if I machine the pistons or take my 9" grinder to the rings

If I did not laugh I'd throw something.

In frustration I went & put down my first batch of home brew, this garage is no longer dry. :

trustme screwed with this post 07-14-2013 at 12:55 AM
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Old 07-14-2013, 04:37 AM   #81
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With head studs you'd never be able to get the head off in place (unless it was in a Featherbed), or can you remove the studs for head removal and install ? You can open up ring lands with 2 blades in a hacksaw, used blades are better.
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Old 07-14-2013, 12:05 PM   #82
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The 4 large centre studs were always there, I'm hoping it won't be an issue. The new barrels are slightly higher than standard but Mr Map assured me I would have no problem . The way my luck is going I won't hold my breath
I'm a little loathe to start messing with the pistons too much .

Checked emails while I was typing this , Mr Map says don't cut the pistons & email him a set of numbers embossed on the inside of the pistons to find out what happened . He will then send new rings & clips.
Guess he is working on a Sunday
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Old 07-14-2013, 02:19 PM   #83
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You can open up ring lands with 2 blades in a hacksaw, used blades are better.
You can make a bore hone by wrapping 100 grade sandpaper around a 1/2" shaft and use an orange Black and Decker drill. ( gotta be orange unless you have an aluminium one)

Disclaimer: last used in about 1980.
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Old 07-14-2013, 10:31 PM   #84
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You guys are showing your age


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Old 07-15-2013, 02:44 AM   #85
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I guess with an alloy barrel it will need studs as you don't want to be screwing head bolts in and out every weekend, but I didn't think there was much room between head and top tube. If you have to remove the engine to get the head off, you may as well have an XS650...although the Triumph is considerably lighter.
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Old 07-24-2013, 12:33 PM   #86
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Hey Trustme, is your bench queen going to be at Hampton Downs on the 4th Aug?
I've offered Maxheadroom a ride in the Clubmans class as I'm worried about him and this sidecar thingie he has bought.......its a bleedin' Honda Still his Missus said she fancied a bit of swinging....
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Old 07-30-2013, 01:11 AM   #87
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The bench queen reigns supreme. Mr Map said don't touch a thing, it would appear one of his despatch team failed to realise that forged pistons did not use standard rings. Waiting waiting , always waiting
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Old 07-30-2013, 01:56 AM   #88
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You should get a BMW.
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Old 07-30-2013, 12:04 PM   #89
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Unfortunately I'm unable to master the secret handshake
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Old 07-30-2013, 03:03 PM   #90
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You should get a BMW.
Steve McQueen would disown him.
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