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Messages - Charlie

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British Bikes / Re: luggage rack to fit a Triumph T160
« on: March 20, 2007, 11:05:15 PM »
I've been looking for a supplier of a rack for a T140 for months and so far have failed to find any companies that produce luggage racks for classic bikes - so I think you're going to struggle to get a new one. I ended up polishing up a really rusty old one I got hold of.

There might be someone making them in the USA or maybe down under, however I have not found anyone yet.

Good luck with the auto jumbles.....

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British Bikes / Re: 5 Speed Bonnie gearbox help
« on: February 20, 2007, 05:58:19 PM »
Hi, I recently had exactly the same symptoms when I rebuilt my Jubilee T140 5 speed gearbox - it was caused by misalignment of the quadrant.  Here are some tips that I worked out after much trial and error.

a) Make sure you've got a way of turning the engine over; remove the index plunger and spring so you can easily move the cam plate to change gear; install all the gears. (Use lots of thick grease to hold bits in place if necessary).
b) Rotate the cam plate as far as it will go so that first gear is engaged. Make sure the cogs closest to the open side of the box are fully meshed together. Turn the engine over a few times to make sure the cogs are all aligned OK and that first gear is working.
c) Dont yet put the gastket or any goo in place.
d) Gently push the gearbox inner cover into place, with the quadrant hanging down under gravity. Just before the cover goes home rotate the quadrant so the inside part rises just a few millimeters - you should be able to feel the quadrant mesh as you push the cover home.
e) Do up the 3 retaining bolts/screws lightly.
f) Slip the clutch push rod into place and leave it so it sticks out about half an inch.
g) Replace the index plunger.
h) Using a long tyre lever or similar you can GENTLY lever the quadrant against the clutch push rod so it changes gear. You'll need to turn the engine over as you are doing this - preferably by rotating the rear wheel. Make sure all 5 gears plus neutral engage.
j) Once you're sure you've got the hang of it, remove the gearbox inner cover and refit in the same way only this time use a gasket!

I found the Haynes and Triumph manuals fairly unhelpful on this topic, but once I stopped trying to understand them and used the technique above it all fits together easily. (And works!).

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British Bikes / Re: T140 Compresssion PSI Value
« on: February 22, 2007, 07:35:45 PM »
I've done some more tests and had these results:

- Add a squirt of oil and the PSI rises from 110 to about 115 on both sides.
- Doing the test with throttle open and closed makes no noticeable difference

Having thought about the physics of this I think the ideal PSI value is easily calculated - surely it's just the compression ratio x atmospheric pressure, i.e. 7.9 x 15 PSI = 118.5 PSI. If you subtract a bit for living above sea level, bad weather, losses past the rings etc, I reckon a PSI value of 110-115 is pretty good. This logic seems to work on my car too - 9:1 compression ratio and 135PSI when I measured it last night.

Any physicist classic bike enthusiasts out there who'd like to comment? :)

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British Bikes / Re: T140 Compresssion PSI Value
« on: February 20, 2007, 01:21:27 AM »
Thanks!
Interestingly my compression guage registers green (good) from 130PSI to 170PSI - I suppose it's designed for these new fangled engines that don't last like real bike engines.

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British Bikes / T140 Compresssion PSI Value
« on: February 19, 2007, 10:36:04 PM »
Does anyone know what compression pressure you should get on an unmodified Triumph 750cc T140 (1977 model) with composite head gasket? I'm getting 110 PSI on both sides after about 5 kicks. Is this normal?

All thoughts gratefully received!

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British Bikes / Silver Jubilee Bonneville valve timing
« on: May 16, 2006, 05:58:56 AM »
Hi, Does anyone have any info on aligning the timing pinions on a 1977 SIlver Jubilee Bonneville? There are multiple 'dots'  on both inlet and exhaust pinion wheels and I've no idea which ones are the right ones to align. Has anyone worked their way through this problem before?

Thanks for your thoughts....
:-[

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