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Messages - tony27

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1
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

2
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

3
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

4
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

5
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

6
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

7
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

8
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

9
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 

10
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



11
Tech Talk / Re: Unlocking a motor
« on: October 30, 2018, 05:34:35 PM »
Definitely good to have a win.
Had the crank split today & the pin looks good, not so good news for the rod but I'm pretty sure the rod out of the motor that had damaged pin & roller is good. No rod kits here in NZ at the moment & it sounds like they might be in short supply in the states at the moment so I'll need to get 1 out of Europe.
I'm dropping the cases off tomorrow for vapourblasting & will have to see if I can find a spacer for between the main bearings as that was missing, all going to plan I should have the motor back together by the end of the year.
I talked to Steve Roberts this afternoon about straightening out the bent rear frame tubes & once I've stripped the rest of the bike down I'll take the frame over to him

12
General Discussion / Re: Yet another scam
« on: October 30, 2018, 11:22:57 AM »
Read a news article in the last couple of weeks saying that the groups most likely to be taken by any of these scams was the young & under 40 males, they're so used to everything being online that they don't stop to think that something doesn't seem right with a email
The stats are meant to be quite scary & getting worse

13
Tech Talk / Re: Unlocking a motor
« on: October 29, 2018, 04:51:50 PM »
Would have thought coke would attack the piston but it's worth a shot. Going to measure the cylinder properly & confirm it's condition is as good as my initial measurement suggested

14
Tech Talk / Re: Unlocking a motor
« on: October 29, 2018, 01:01:23 PM »
I need to get the rings out in 1 piece now, the place who have rings only go to 80.75mm & I need 81mm. If I can get the rings free & measure the gap it will help me decide on what size motor I'll have
Any suggestions on what to soak the piston in that will soften any carbon etc without damaging either part?

I split the cases to find 50 year old Czech bearings & a gearbox with most gears looking great so apart from a rod kit it shouldn't require much that I don't already have to rebuild the botton end

15
Tech Talk / Re: Needle jet shroud height changes? Mikuni VM38.
« on: October 15, 2018, 06:53:25 PM »
Shrouds on 4 strokes seem to be shorter in general

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