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Messages - tony27

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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

Tech Talk / Re: Needle jet shroud height changes? Mikuni VM38.
« on: October 14, 2018, 01:01:54 PM »
I have 1 of those sitting here, don't fit the new mikuni slides, possibly may fit in a snowmobile slides if they are thinner walled

CZ / Re: ktm weren't always right
« on: September 25, 2018, 06:21:51 PM »
Pretty sure the mechanics were trying to shove sticks through the spokes. The disquailification was pure politics, the russians were much more powerful than the Czechs

Tech Talk / Re: Curing handlebar vibration.
« on: September 16, 2018, 05:18:59 PM »
There used to be foam filled bars on the market, basically filled with space invader

CZ / Re: Installing shift plate & top cover
« on: September 12, 2018, 05:31:48 PM »
You'll be glad CZ did their gear change how they did & you didn't need to split the cases to find the problem. I thought it would be a fairly easy fix

CZ / Re: Installing shift plate & top cover
« on: September 12, 2018, 11:14:40 AM »
Is this the type with the shift plate in the cases or attached to the top cover?
I've never had problems with not getting gears but you do need to have the gearbox rotating if you're trying to get the gears while on the bench. It would be obvious if you the forks assembled wrong.
If you send me a photo of how things are sitting I should be able to see if there is anything that jumps out at me
I can take a photo of my sidepipe box with the cover removed if you want, only 4 speed but basically the same as the earlier 5 speeds that have the shift plate in the cases

Tech Talk / Re: Pro-Form exhaust fit
« on: September 10, 2018, 08:51:27 PM »
The tip I was given when using the red silicon was to let it sit long enough to form a skin before fitting & then don't fully secure it until the next day

CZ / Re: sidepipe exhaust bracket
« on: September 06, 2018, 08:09:18 AM »
This is a photo from Bertus' site showing the brackets below the pipe. Only photo I've seen of them available, none of the european sellers show the brackets

Tech Talk / Re: Curnutt shocks?
« on: September 02, 2018, 06:50:44 PM »
Scootern29 worked for curnutt & rebuilds them so should be able to give you advice on if you need to change anything

CZ / Re: sidepipe exhaust bracket
« on: August 26, 2018, 05:54:41 PM »
Can't say I've seen any of the normal sellers advertising the brackets, not sure if the new pipes come fitted with them. The original chamber that came with my project doesn't have 1 either but I don't plan on running that due to no the lack of muffler

General Discussion / Re: physical
« on: August 13, 2018, 05:37:09 PM »
But who rolls & smokes their bacon rather than eat it?

CZ / Re: 360 sidepipe pistons
« on: July 25, 2018, 07:02:56 PM »
Got the motor apart & the bore looks good so the piston or rings at minimum I need are 80.91mm for a 81mm bore. Piston appears to be a Kolbenschmidt

Tech Talk / Re: Unlocking a motor
« on: July 18, 2018, 07:01:58 PM »
Motor freed up amazingly easily, only had the kero/brake fluid mix in the cylinder for a couple of days.
After washing the motor with degreaser & the water blaster I loosened off the head & cylinder base nuts, top of the piston was fairly clean & the head has no signs of damage at all. Out of curiousity I tapped the top of the piston with a dead blow hammer (no room to swing it) & thought I saw movement so I kept going.

This is what I found. Piston is in good condition but fitted backwards, somehow the rings hadn't snagged the exhaust ports

Bore within spec & only in need of a hone but new rings may not be available

Wanted / Re: 1974 CR250M crankcases
« on: July 17, 2018, 07:22:18 PM »
There are kits available that have a spacer under the barrel, 1 of the guys here in NZ bought 1 after having the crankpin break from memory

CZ / Re: CZ Aftermarket Head. Period Item?
« on: July 14, 2018, 06:35:50 PM »
I managed to score 1 last month out of the states, came up for $80us so I grabbed it before I even had the sidepipe in my possession. Quite a bit heavier than the original head but will definitely give the bike a bit of period trickness

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