Messages

1

CZ / Re: Sidepipe rear subframe

« on: February 15, 2019, 11:14:03 AM »

Unfortunately the points cam is badly pitted & would chew out the fibre block in no time. I'm probably going to use Electrexworld's twin plug ignition & the JOK head

2

CZ / Re: Sidepipe rear subframe

« on: February 13, 2019, 12:34:59 PM »

Drawing that Lee Holth/CZGuy sent me showing the height of the rear loop etc on all black frame bikes

3

Twinshock Trials / Re: Attempting to build a trials CT110 with grandkids

« on: February 04, 2019, 10:09:55 AM »

Most of the extreme enduro guys have been high level trials riders, think Kevin Schwantz was Texas champion before taking up road racing

4

CZ / Re: Side-Piper tank

« on: January 28, 2019, 10:05:05 AM »

This code was uploaded on 1 of the american based CZ facebook pages, should be something that a paint mixer can use easily as it gives the various amounts to use



My bike is the yellow 70 model which I haven't seen the code for, at the moment I haven't decided on whether to leave it this colour or try & pick up a second tank & have an orange tank as well

5

Wanted / Re: WANTED- 5x4 pattern knobby, 4.50 or 5.00 x 18.

« on: January 27, 2019, 04:16:19 PM »

The Mitas will be the same as the Trelleborg, from memory they took them over 10 or so years ago

6

Tech Talk / Re: Are there any good mods for Yam DT2 forks?

« on: December 29, 2018, 05:06:16 PM »

Cartridge emulators are available. I run Race Tech gold valves in a set of TY250 forks which like the DT2, have 34mm Kayaba fork tubes. The gold valves took ages to get set up but are quite good now.
On another trials bike with TY250 forks I have fitted aftermarket (modern) damper rods made in the UK which worked great without any setting up required. They are made of aluminium, have slightly more travel than standard (about 5mm extra) and most importantly have much better damping action than the standard damper rods provide.
I'm sure either of those methods would also make DT2 forks work better for MX.

These will be the parts, I have the full set up in my TY250 & the difference to how the forks were is huge
http://www.yamaha-majesty.com/?product=ty250-alloy-damper-rods
Thanks Dave :-)  Any idea what company in the UK made the damping rods? l'd like to get some.

7

General Discussion / Re: Pressing out swing arm axle

« on: December 08, 2018, 03:13:59 PM »

Wish that would work, my pivot is the proper sidepipe type with a head rather than a bolt in from both ends. Have been considering ordering a new engine mount from etovar.cz & cutting the original mount up

8

General Discussion / Re: Pressing out swing arm axle

« on: December 07, 2018, 06:34:04 PM »

What was the swingarm out of? I'm figuring my sidepipe is going to end up like that although the engine mount won't be the only place it's seized

9

General Discussion / Re: GMC

« on: November 29, 2018, 07:16:04 PM »

Don't think the email has, heard from him last week about a pipe order

10

General Discussion / Re: Used to Race - Not Racing Now - What would bring you back?

« on: November 25, 2018, 04:02:15 PM »

Geoff,you have to remember that here in New Zealand we don't sue for personal injury due to having a no fault scheme called ACC. That would mean the insurance only has to cove public liability.
VMX in New Zealand runs completely independent of MNZ using their own public liability insurance unless a club decides to run the class at 1 of their events which are always all in races from what I've seen

11

Tech Talk / Re: Sparkplug technical information.

« on: November 25, 2018, 07:30:26 AM »

  HI John.  Champion and NGK has released some very good Tech articles over the years . Make very good reading.

   One interesting article is on  Surface Gap Plugs, No Heat Range. Hard to foul.

   Made for 2 stoke outboards, Nitro engines . Used by Porsche,F1 and in other race cars using mechanical Fuel injection. Do not know if there still used. Except Drag cars.

   Also Oem Spark plugs on the early Kawasaki Mach 1.   Requires a very High energy ignition System to fire the plug.

    BuY the way . Supercheap NGK BR9EG $13.95. A good Price.

 

Yeh l run "surface discharge" plugs in my race GSXR1000 Superbike.

When the first Sherco 450s came out the importer at the time loaned me his personal bike as way of getting them seen & he was running a surface discharge plug out of the 600 supersport kit for GSXRs, I'm pretty sure it had come out of 1 of the WSS bikes he'd worked on in Italy. He told me the cost of each plug in the kit & it was scary

12

General Discussion / Re: CD15 new venue in may

« on: November 10, 2018, 03:19:00 AM »

Read the facebook post from VMX mag, decision to change date & venue wasn't really theirs, the club wants to run their own event at Conondale on classic dirts usual date

13

CZ / Re: 360 sidepipe pistons

« on: November 08, 2018, 07:03:43 AM »

Contacted Piotr when I first took the top end off & he wasn't able to help, probably going to have to ask Bertus if he has 1

14

CZ / Re: 360 sidepipe pistons

« on: November 07, 2018, 07:17:42 PM »

Was able to get the rings off the piston by sliding a feeler gauge under the end of the ring & sliding it as far around as possible, I then tapped the ring where it was clear of the groove with a lump of copper to help pull the ring clear of the groove on the other side of the feeler gauge, I then moved the feeler gauge further around & repeated, took about half an hour to get both out & the grooves clean. Need to see what the end gap is before deciding on whether to try & source a new piston kit or have the cylinder bored out to 82mm

15

CZ / Re: Sidepipe rear subframe

« on: November 07, 2018, 07:09:03 PM »

The mapp gas heated the weld enough to soften it enough for it to let go of the mount but not fully melt it.
For some reason the left mount & plate both had bad arc welds under the bronze welds. Unfortunately when I got the left mount off there was a small patch of the tube attached to the mount & on the back of the tube was a crack. I'm thinking the best way to repair this would be to remove the damaged section of tube & turn up a replacement section that fits inside the original tube at each end

Hopefully I can unseize the swingarm pin from the frame in the next couple of days & take it over to Steve Roberts for him to have a look at sorting the bends & the damage to the tubes