Messages

1

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

2

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

3

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

4

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

5

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

6

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

7

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

8

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

9

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

10

CZ / Re: Sidepipe rear subframe

« on: November 06, 2018, 09:41:06 PM »

Looking at bunnings site it appears mapp gas burns about 85c hotter, replacement bottles are cheaper so I may see if the local place has them in stock tomorrow morning

11

CZ / Re: Sidepipe rear subframe

« on: November 06, 2018, 02:01:45 PM »

Got the plates off pretty painlessly, right/pipe side took maybe 5 minutes with a cutting disc & deadblow hammer, other side took longer as I think the welds were longer & 1 was closer to the joint of the 2 tubes so I had to be a bit more careful.
Turns out all the welds are bronze so I'll file them smooth, haven't attempted the shock mounts yet but am wondering if the small propane bottle gas torches from bunnings would be hot enough to melt the bronze again, 1 of the sets says it produces up to 1900C which should be way hotter than needed & it will also be handy to try & get the swingarm pin to move in the frame. Thoughts on that?

https://www.bunnings.co.nz/tradeflame-propane-handyman-full-flame-blow-torch-kit_p05910245

12

CZ / Re: Sidepipe rear subframe

« on: November 03, 2018, 06:44:36 PM »

Hoping to be able to get the original tubes straight, the original shock mounts are perfect so it would be a pity to have to disturb them
360s had slotted rods standard but the 380/400 rods are dimensionally the same & are what get used when replacement is needed

13

CZ / Re: Sidepipe rear subframe

« on: November 02, 2018, 06:38:29 PM »

Planning on making a start on removing the LTR conversion when my weekend starts on Tuesday, will use small cutting discs to cut the welds on the plates & try snap them off. Once I've done that I'll start work on freeing up the swingarm
Cases are with 1 of the guys who works in the same building as me for vapour blasting, have to get a rod kit out of Europe before I can start building the engine

14

CZ / Re: Sidepipe rear subframe

« on: November 01, 2018, 05:00:14 PM »

Standard mounts are still there but as you can see in the photos both the seat tubes & uprights have bends. I think once Steve Roberts sees the frame he'll understand what needs to happen.
Getting the swingarm out looks to be as big a issue as the pin appears to be stuck in the frame as well as the engine mount. I actually don't care if I have to destroy the mount as they're available new for about $35us from Slovakia but I may need to drill the pin out of the frame on both sides
I may end up running a 74 or Falta swingarm so that I have 1 spare wheel for the 2 bikes otherwise I could make a short spacer for the swingarm & adjuster to let me use the original arm out of my 73 

15

CZ / Sidepipe rear subframe

« on: October 31, 2018, 09:18:00 AM »

Getting ready to have the rear subframe put back to standard - LTR conversion removed & tubes straightened, is the subframe basically the same as the twinport or black frame bikes as the frame builder asked me do I have a reference for him to go off.
Last time I was there he had 1 of his friends 250 twinport in the shed so if they are the same that would work well