Search found 32 matches

by brent j
Tue Jun 23, 2020 8:59 pm
Forum: Twinshock & Classic Trials
Topic: Twinshock universal mudguards
Replies: 8
Views: 2101

Re: Twinshock universal mudguards

Don passed away years ago but there is still Don Newell Motorcycles selling Bultaco parts https://newellmotorcycles.com.au/ I sent a message to Bultaco parts a few weeks ago but haven't heard back . I do like the look of the Gonelli guards, the only better looking ones would be original pattern RL ...
by brent j
Tue May 12, 2020 10:24 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2403
Views: 1030317

Re: Basket Cases

Brent, I love your work, especially on the lower backbone around the relocated swingarm pivot. Very clever use of that small 'gap' in the rear of the engine cases. Just wondering though if there's a reason you're not taking the opportunity to reduce the wheelbase somewhat given how long the RL is (...
by brent j
Tue May 12, 2020 9:58 pm
Forum: Twinshock & Classic Trials
Topic: TS185 trials bike
Replies: 5
Views: 1213

Re: TS185 trials bike

There was a guy in NZ in the 70's who built a trials TS185. He made a smaller seat, hand made exhaust with a much longer head pipe, rear set pegs and he fitted a TS250 CDI and I think flywheel and ignition. I believe the 250 CDI gave a better advance curve for trails. I know he talked about deraking...
by brent j
Fri Apr 17, 2020 9:10 pm
Forum: Twinshock & Classic Trials
Topic: Extra home workshop time
Replies: 36
Views: 6994

Re: Extra home workshop time

OK here's a Dr Karl question for everyone about the fuel tank. I filled it to the top yesterday with a mixture of diluted molasses and phosphoric acid and made sure I got all the bubbles out. That's when I took the photos. This afternoon I checked on it and the level had gone down - see today's pho...
by brent j
Mon Apr 13, 2020 3:56 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2403
Views: 1030317

Re: Final Drive Ratios

Hi Everyone, Brent, can I add to your list as I am not sure where you are up to with regards to gearing and shock length? Are you going to choose 428 or 520 chain and sprockets? Just my opinion but 520 is my first choice on any 200 or bigger as there are less pivots to wear out. Working out final d...
by brent j
Sun Apr 12, 2020 9:04 pm
Forum: Twinshock & Classic Trials
Topic: Fork angle different to steering head angle
Replies: 8
Views: 4600

Re: Fork angle different to steering head angle

Trail has more influence on handling than rake. I spent a few years building XT/TT500 Yamahas for VMX. I did a lot of swapping around with different Yamaha and Suzuki fork legs and triple clamps. I even bored a set of Honda triples to take a Yamaha steering tube. Yamaha and Suzuki both have 60mm tot...
by brent j
Sun Apr 12, 2020 11:52 am
Forum: Twinshock & Classic Trials
Topic: Fork angle different to steering head angle
Replies: 8
Views: 4600

Re: Fork angle different to steering head angle

The biggest problem with my RL is that I want to ride it NOW! but it's still a few months off. I hope to start on the engine soon. I'm quite used to bikes with minimal trail. As a youngster I tried the MX hero bit but quickly found I was too cautious. I got into trials and rode for years in NZ and u...
by brent j
Sat Apr 11, 2020 8:23 pm
Forum: Twinshock & Classic Trials
Topic: Fork angle different to steering head angle
Replies: 8
Views: 4600

Re: Fork angle different to steering head angle

The (probably) SP250 forks on my RL have less offset than RL forks so my trail will be increased from 76mm to 80mm for the same steering head angle. It will be interesting to see what the difference in handling is although I don't have anything to compare it too.
by brent j
Sat Apr 11, 2020 6:57 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2403
Views: 1030317

Re: Basket Cases

My repair starts with sanding the paint and a layer of fibre glass placed in top of the seat base. This is the first coat of resin, The next will be the front (lower part of the picture) and sticking down the edges
by brent j
Sat Apr 11, 2020 6:56 pm
Forum: Twinshock & Classic Trials
Topic: Basket Cases
Replies: 2403
Views: 1030317

Re: Basket Cases

The seat base was very heavily rusted. I used rust converter and bead blasted it several times. This is the base with one coat of POR-15 paint applied. I repaired the seat base of my TS90MX the same way as I'll show for this one. Unfortunately I don't have "before" photos of either.

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