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Topics - tony27

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Tech Talk / Sloppy 34mm forks
« on: October 29, 2017, 07:32:06 PM »
I need to fit bushes to the top of my TY250 forks as both legs blow seals & if I grip each leg with the wheel out there is definite play in them
Does anyone know of a 34mm fork that has bushes in the top of the sliders or am I going to need to custom make a pair with a fairly thin wall thickness?

eBay Finds / RM400 rod kit?
« on: March 15, 2017, 11:01:18 AM »
Saw this on trademe, seller not quite sure about fitment
Have a read of the listing & check measurements.

CZ / 400 Falta timing
« on: February 04, 2017, 02:22:59 PM »
I've just received a Falta head to go with my Southbay modded Falta cylinder & have come across a couple of different ignition timing figures
Some sources like the Clymer manual say all 380s/400s should be timed 3.4-3.6mm but I've also seen a spec sheet that listed the Faltas as 3.8-4.0mm
Compression on the Falta was listed as being higher than the earlier models
What sort of timing figure are people using in their Faltas?

Tech Talk / Port repair
« on: December 13, 2016, 05:18:03 AM »
I picked up a cylinder out of the states for my CZ a couple of  months ago which has the boost ports added to run a big DH reed valve which I already have
When I put the reed block & cylinder next to each other I found the the intakes had been opened out about 5mm on each side & are that amount wider than the reed block which definitely won't allow that amount of opening up to match
I'm considering having the ports welded up a bit as well as the gap between the manifold mount & next fin filled in as my modified Falta cylinder has then getting the mount machined flat & matching the port width & reed block to each other
What are peoples thoughts on this or any other suggestions
The extra width is quite obvious here & you can see the gap I'm going to have filled in

Spaniards (Bultaco, Ossa, Montesa etc) / What year is this Bully?
« on: November 20, 2016, 05:25:08 PM »
Any idea what year & size this Bultaco is?

Tech Talk / Mikuni VM float height
« on: October 02, 2016, 10:15:22 AM »
What is a baseline setting for the float height on a new VM Mikuni?
I just bought a new 36mm to complete converting my CZ to reed valve & suspect the float height is a bit high, the overflow tube has a bit of fuel sitting in it & exiting corners the motor isn't running clean
I tried lowering the needle to the top clip which didn't really help & because I was running the motor in I couldn't bring myself to spend the time at higher revs to get around it
Really need to sort before I go back to work tomorrow night as the next meeting is on Saturday

Wanted / GEM V-6 reed
« on: August 15, 2016, 05:17:43 PM »
I'm after a G.E.M V-6 reed cage at the minimum, I haven't found the safe place that I put the reed cage & carb mounting block for my CZ while the exhaust port was being repaired
I still have the CZ specific main casting & can get another mounting plate machined & retap the threaded holes to metric sizing
The 75 GEM catalogue suggests that the reed cage is common to multiple fitments with the main casting being the difference

Manuals & Technical Doco / 1975 G.E.M catalogue
« on: July 06, 2016, 01:44:06 PM »

Tech Talk / Piston window radius
« on: June 27, 2016, 03:18:54 PM »
Finally got the holes & slot put into the back of my CZ piston to Charlie Richardson's provided sketch for running a reed valve & would like to know how big to make the radius around the holes as I've never had anything to do with modifying pistons
At the moment I've basically broken the sharp edge off both the inside & outside of the holes with needle files to .5-1 mm wide, is this enough to remove to the stresses from having sharp edges

Initial work 

CZ / Folding footpegs for side-piper
« on: June 22, 2016, 07:05:27 PM »
What do people do to get folding footpegs on their side-pipers?
I got rung up earlier tonight to find out if I'd like to race a 360 in pre70 this year instead of the husky 400 cross we'd been planning on.
I know I can get a new non folding set fairly easily to modify if needed but pointers on what others do would be helpful

Tech Talk / Boyesen reeds
« on: June 01, 2016, 11:55:26 PM »
Is there a cross reference for boyesen reeds with dimensions available anywhere, have a couple of aftermarket pre75 reed blocks that I'd like to see there are off the shelf reeds that fit

Husqvarna / 69 400 Cross
« on: April 23, 2016, 09:57:43 PM »
I got offered a 69 400 Cross to use in pre70 next season today, are there any downfalls with them ie known weak points or parts that are impossible to get?
How different will I find it to ride compared to my 73 CZ?

Foto Forum / Interesting bike at eNZed final round
« on: March 06, 2016, 07:17:09 PM »
Took a couple of photos on my phone of 1 of the most unusual bikes in the pits. A Weslake engined Ducati

Yamaha / Does anyone own a YZ85 & can measure the reed block for me?
« on: January 02, 2016, 05:30:06 PM »
I'm trying to get the width of the reed block off a YZ85, according to partzilla/ the assembly is used from the 1993 YZ80E1 onwards

CZ / Kickstart spring issues
« on: November 16, 2015, 09:24:31 AM »
At the last meeting I rode something strange happened with the kickstart spring, instead of breaking the tag that locates into the cases straightened out so it lost tension & I ended up cable tieing the kickstart forward to the clutch & bump starting it for the rest of the day
I have a new spring which I've fitted but something doesn't seem right. I can get full travel of the lever if I run almost no tension - hole in case & shaft are in line but the kickstart doesn't fully return, if I undo the stop screw & rotate the kickstart down to enough tension for the lever to return with the screw back in I then have only about 3/4 travel
Does this make sense? Can take some photos in a few hours to show what I mean
Never had a problem like this before & only thing that has changed is the spring which is identical to the old 1

Damaged spring

New spring fitted without tensioning

Full travel

Return point without tensioning

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