31
Yamaha / Re: YZ125G stator winding resistance.
« on: June 27, 2018, 08:00:56 AM »
Think a few people are using imgur now, may have the spelling wrong
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32
Tech Talk / Re: Unlocking a motor
« on: June 25, 2018, 02:25:28 PM »
Was found in Auckland I think but has a south island history, sounds like Paul Doecke knows who raced it back when Paul won the New Zealand title in 69 or 70
33
Tech Talk / Re: Unlocking a motor
« on: June 24, 2018, 06:13:11 PM »
Steve Gallichan picked it up amongst a package of 4 bikes & parts, he kept the Maicos & gave me first option on this 1 as he already has a 360 sidepipe that he's restored. Needs to get a twinpipe now so he has all the stages of CZ evolution
Going to take a far amount of time & money to get it race ready but I never thought I'd get my hands on 1
Already have the correct shape front guard & a JOK radial head coming for it, the biggest expense will probably be the getting the forks rechromed.
May have to see what parts I can come back from the CZ worlds with next year depending on how far along the rebuild is at the time
Going to take a far amount of time & money to get it race ready but I never thought I'd get my hands on 1
Already have the correct shape front guard & a JOK radial head coming for it, the biggest expense will probably be the getting the forks rechromed.
May have to see what parts I can come back from the CZ worlds with next year depending on how far along the rebuild is at the time
34
Tech Talk / Re: Unlocking a motor
« on: June 23, 2018, 03:22:28 PM »
That sounds gentler than beating on the end of a lump of wood
35
CZ / 360 sidepipe pistons
« on: June 23, 2018, 02:36:00 PM »
Are pistons available for 360s? I know OTZ has rings in 80, 80.25, 80.5 & 80.75 but don't show 360 pistons
Any possible sources that people can suggest?
Not sure what size bore the bike I have coming is but if possible I would prefer to keep it as a 360 rather than open it out to 380 when I rebuild the engine
Any possible sources that people can suggest?
Not sure what size bore the bike I have coming is but if possible I would prefer to keep it as a 360 rather than open it out to 380 when I rebuild the engine
36
Tech Talk / Unlocking a motor
« on: June 23, 2018, 02:28:35 PM »
I have a CZ sidepipe coming which I've been told is locked up, has been sitting a long time so I don't know exactly how bad but knowing CZ bearings I assume rings stuck to the cylinder is the most likely reason
What is the best product to soak the cylinder in to slowly work on freeing things up?
Once the cylinder is free I'll be replacing every bearing in the motor, depending on condition of the bore I may get away with rings for a 360 which are available unlike I suspect pistons
What is the best product to soak the cylinder in to slowly work on freeing things up?
Once the cylinder is free I'll be replacing every bearing in the motor, depending on condition of the bore I may get away with rings for a 360 which are available unlike I suspect pistons
37
Twinshock Trials / Re: Longterm TY250C
« on: June 18, 2018, 10:16:11 AM »
Have only ever ridden it without the weight so I can't say what it was like with the heavier flywheel. It's quite a nice motor, almost feels modern. I'm still running the standard carb but the airbox has been altered & I have a v-force reed block for a yz85 fitted
Biggest set up issues I've had so far is no freeplay in the clutch & needing to be quite deliberate in changing gears. I may also need to find a richer needle as I ended up on the lowest position
The full majesty forks work well, didn't get to try them on big rocks but I couldn't fault them on roots & the medium sized rocks in a river bed that we had in a few sections
Biggest set up issues I've had so far is no freeplay in the clutch & needing to be quite deliberate in changing gears. I may also need to find a richer needle as I ended up on the lowest position
The full majesty forks work well, didn't get to try them on big rocks but I couldn't fault them on roots & the medium sized rocks in a river bed that we had in a few sections
38
Twinshock Trials / Longterm TY250C
« on: June 17, 2018, 07:00:35 PM »
Finally got my 250C back in a ridable state. We worked out it had been about 5 years since I'd ridden it last when the main bearings & rings were that worn that the motor could be turned over by hand by gripping the end of the crankshaft with the flywheel off
While the motor got a full rebuild with the cylinder being bored to 1st oversize I made a few changes both to looks of the motor & had the swingarm extended with shedworks axle plates
The axle plates extend the swingarm by 38mm or so which puts a bit more weight to the front. As it turns out even with the lengthened swingarm the wheelbase is standard which confirmed that the steering head angle had been modified, the welds are far better than normal & the front down tube are completely smooth. We stood the bike in front of a Beta Techno & the fork angle is the same which makes sense as the Techno was the current bike when the mods would have been done
The original shock mounts were deleted & a gusset fitted to help strengthen the tubes above the repositioned mounts that were done before it's last ride
I fitted a DT250C head that Ian Cameron supplied me for looks, I race a 73 CZ & owned a YZ465H when I built the motor so radial heads are my preference. The combustion chamber is meant to measure the same. There was minor grinding of a couple of fins to clear the exhaust & I cut about 10mm from the rear to match it to the cylinder
An electrexworld ignition is fitted now with the band removed from the flywheel, I had to put marks on the flywheel & stator plate for timing while the head was off. Unfortunately we didn't get a chance to strobe the timing as per the fitting instructions & had to run it set at the middle of the slots but it seems to work well
I'll see what other detail photos I have & try to put them up at some stage
While the motor got a full rebuild with the cylinder being bored to 1st oversize I made a few changes both to looks of the motor & had the swingarm extended with shedworks axle plates
The axle plates extend the swingarm by 38mm or so which puts a bit more weight to the front. As it turns out even with the lengthened swingarm the wheelbase is standard which confirmed that the steering head angle had been modified, the welds are far better than normal & the front down tube are completely smooth. We stood the bike in front of a Beta Techno & the fork angle is the same which makes sense as the Techno was the current bike when the mods would have been done
The original shock mounts were deleted & a gusset fitted to help strengthen the tubes above the repositioned mounts that were done before it's last ride
I fitted a DT250C head that Ian Cameron supplied me for looks, I race a 73 CZ & owned a YZ465H when I built the motor so radial heads are my preference. The combustion chamber is meant to measure the same. There was minor grinding of a couple of fins to clear the exhaust & I cut about 10mm from the rear to match it to the cylinder
An electrexworld ignition is fitted now with the band removed from the flywheel, I had to put marks on the flywheel & stator plate for timing while the head was off. Unfortunately we didn't get a chance to strobe the timing as per the fitting instructions & had to run it set at the middle of the slots but it seems to work well
I'll see what other detail photos I have & try to put them up at some stage
39
Tech Talk / Re: Fuel cap gasket.
« on: May 28, 2018, 02:48:08 PM »
Partzilla's photo shows the cap as a unit only, no seperate gasket but they do list the whole cap so it may be worth asking your local yamaha dealer.
Part number shows it fits quite a few different model of XT of all capacities
https://www.partzilla.com/product/yamaha/3Y1-24610-01-00?ref=e0f4da4af42824524024d1f0b57483e103eba86c
Part number shows it fits quite a few different model of XT of all capacities
https://www.partzilla.com/product/yamaha/3Y1-24610-01-00?ref=e0f4da4af42824524024d1f0b57483e103eba86c
40
General Discussion / Re: 18th this year
« on: May 19, 2018, 10:04:37 PM »
Scary headline I saw earlier today was that there have been more students killed this year than servicemen, if that's correct it is a really bad state of affairs considering how many wars the states are officially & unofficially fighting
41
Tech Talk / Re: Chain sliders
« on: April 25, 2018, 03:04:59 PM »
I use a from memory Cemoto 1 on my CZ that seem to be aimed at use on old british bikes in the main but a quick look on ebay has a heap that could easily work listed for pit bikes for around $10
If you are making your own the most common sheet to find will be nylon which will take the shape nicely with heat & clamping
If you are making your own the most common sheet to find will be nylon which will take the shape nicely with heat & clamping
42
Tech Talk / Re: Bottom allen bolt and fork seal removal on 1982 YZ250J??
« on: April 05, 2018, 08:55:17 AM »
When I did my YZ465H forks which are the same basic design I stripped them down fully rather than trying to hydraulic out the seals as described in the manual, I needed to do the bushes as they were worn & they are the first point of sealing
Moose racing/All Balls racing do a kit with bushes & a few extra parts that is cheap enough to let you do the whole job properly
Moose racing/All Balls racing do a kit with bushes & a few extra parts that is cheap enough to let you do the whole job properly
43
CZ / Re: cz falta project
« on: April 04, 2018, 05:26:17 PM »
OTZ in Poland show new hubs as being available, not sure if they're still made of elektron but they do look the same
You can go for their works hub which ditches the steel sprocket mount if your pockets are deep enough
You can go for their works hub which ditches the steel sprocket mount if your pockets are deep enough
44
Tech Talk / Re: Improvements to lathe
« on: March 28, 2018, 08:52:05 PM »
Don't forget that on the cross-slide you're indicating half what you're actually taking off, came across a lathe that had the dials reading on radius rather than diameter which is really unusual
Good way of getting a DRO on a small lathe, only downsides are screensize & visibility
Good way of getting a DRO on a small lathe, only downsides are screensize & visibility
45
Tech Talk / Re: Mikuni metric threads??
« on: March 28, 2018, 08:45:38 PM »
Metric but not the same as common fasteners. A lot of their stuff is listed as ISO type which is what the dot on the head indicates