Search found 3268 matches

by David Lahey
Sun Mar 17, 2019 9:26 am
Forum: Twinshock & Classic Trials
Topic: TY 250 B reed valves
Replies: 1
Views: 179

Re: TY 250 B reed valves

There was discussion on this subject a few weeks ago on Trials Central. One person said that back in the day they used to carefully remove the protruding rubber when they fitted composite reeds, but didn't remember how they did it. I bought Boyesen dual stage reeds for a TY250 motor many years ago b...
by David Lahey
Fri Mar 01, 2019 9:44 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2180
Views: 680249

Re: Basket Cases

So David, can I enter my Sherpa in this clutch pull competition? There is a big difference between those two levers. I know which one I`d prefer. That`s why I still stick with the Amals on all of my :Bultaco: s. Much better leverage. AMAL levers are certainly a wonderful example of industrial art. ...
by David Lahey
Thu Feb 28, 2019 7:00 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2180
Views: 680249

Clutch lever selection

While we are considering the design of clutch levers, surely a lighter clutch lever would improve the steering of a trials bike by reducing the moment of inertia of the front end. This wonderful Australian product from the 1970s sold in huge numbers for a while and lived up to the promise of being u...
by David Lahey
Tue Feb 26, 2019 6:42 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2180
Views: 680249

KT250 clutch pull

IMAG6721.jpg This photo illustrates one the top secret things I'm doing in preparation for the :kawasaki KT250 clutch pull competition with Greg Harding and Chippy and anyone else silly enough to join us. The clutch lever with GB's on it has the holes 20mm apart and the other one from a :suzuki RM8...
by David Lahey
Mon Feb 18, 2019 7:23 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2180
Views: 680249

TY Yamaha clutch cover oil pump hole

When you remove the oil pump from a TY250 or 175, you need to seal off the hole somehow. On many bikes now, I've made a small flat aluminium plate and a gasket and held it on using the screw holes that normally hold the pump on. The photo shows a TY175 cover that has had the oil pump removed and par...
by David Lahey
Mon Feb 18, 2019 3:45 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2180
Views: 680249

Re: TY175 kickstart option

There is a very interesting looking TY175-based bike advertised for sale on facebook. Amongst other things it has an interesting custom made frame, but the thing that really caught my eye was the kickstart. I hadn't thought of doing it this way Guy here are photos of a standard :yamaha TY175 clutch...
by David Lahey
Sun Feb 17, 2019 8:38 am
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2180
Views: 680249

Re: Basket Cases

David, I'm not familiar with the 175, but do you think the casing be strong enough not to crack with the strain put on the kickstart so far away ? Guy Yes I think it would be fine. The casing has a wide steel bush for the kick shaft and the kick shaft is relatively large diameter and well made. The...
by David Lahey
Sat Feb 16, 2019 11:59 am
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2180
Views: 680249

TY175 kickstart option

There is a very interesting looking TY175-based bike advertised for sale on facebook. Amongst other things it has an interesting custom made frame, but the thing that really caught my eye was the kickstart. I hadn't thought of doing it this way
by David Lahey
Sun Feb 10, 2019 3:55 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2180
Views: 680249

TY250 swingarm refurb

All ready for the new bushes to go in. I wonder if the new stand mount will last as long as the :yamaha mount did (42 years). They do fairly commonly fail though and usually it is much earlier in the life of a TY250. I remember a teenage friend of small stature had a TY250A in about 1976 and the onl...

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