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Messages - sleepy

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1
Honda / Re: 83 Honda XR500 Conrod Kit Unavailable
« on: October 11, 2018, 07:02:21 PM »
How did you go with this saga HL500, I am getting my small end fixed if you haven't already done yours it will work out better to do more at once. I have a guy making a jig to hold the crack shaft while being machined. I have two cranks shafts so doing one as a spare.

What is the cost of the Jig? I have always pressed the crank apart to do them and can't imagine how difficult it would be to try and finish hone the bush in the rod hone machine with the crank attached. I would have thought that the $70-80 to press apart and re-assemble the crank would be cheaper than a jig.

2
For Sale / Re: Yamaha dt1 250 none reed valve pre 70
« on: October 07, 2018, 01:46:29 PM »
YZ A or B forks with the turned down between triple trees . I like the number plate someone has put some good ideas into her .
Looks like the triple clamps are YZ as well. They made one of the bikes at the title a few years back change the triples back to period before they could ride.
Definitely need a complete front end change to be pre70 eligible.

3
General Discussion / Re: Quality steel
« on: September 27, 2018, 10:44:17 AM »
You could use mower blades or even car leaf springs. Most older cars had multi leaf rear springs that will harden quite well.

4
Tech Talk / Re: Crank bearing housing resleeving?
« on: September 09, 2018, 08:04:21 PM »
I've sleeved plenty of different make and models using steel sleeves. Pins are not necessary if you get the correct interference and use loctite retaining compound. Once fitted with sleeves it is important not to heat the cases when fitting bearing as the heat will damage the loctite bond.

so basically just heat up the cases, drop all the bearings in and leave the crank bearings at last and install it with loctite once it cools down right? I was told by a couple of people that loctite might break up when the engine is at normal temperature due to the case is aluminum and bearing is hardened steel?

The loctite is to hold the sleeve in place. The machine shop needs to make the sleeve about 3mm in diameter bigger and make it a good interference fit then pressed in with  620 retaining compound. Once in it is machined again to give a lesser interference fit on the bearing. The bearings then need to be pressed into the case to avoid overheating the loctite. Loctite 620 is good for 200*C which is well above the operating temp of the motor. The other bearings in the case can be pressed in with use of good lubricant without damaging their fit if kept square.
I have used the 620 loctite on loose bearings but only when time didn't permit sleeving. It will work for a while but as there is quite a difference in thermal expansion rates between bearings and alloy cases, it will give up after a while of heavy use.

5
Tech Talk / Re: Crank bearing housing resleeving?
« on: September 06, 2018, 08:45:00 AM »
I've sleeved plenty of different make and models using steel sleeves. Pins are not necessary if you get the correct interference and use loctite retaining compound. Once fitted with sleeves it is important not to heat the cases when fitting bearing as the heat will damage the loctite bond.

6
Wanted / Re: yz/dt clutch actuator replacement
« on: July 25, 2018, 10:15:40 PM »
Was me.
Have a look at reply 28.
https://forum.ozvmx.com/index.php?topic=42502.msg402290#msg402290
Still have some for the same price.

7
Tech Talk / Re: Coil Ohms Readings
« on: July 20, 2018, 11:07:53 AM »
This may help if I can get it to work, IT175 diagram could be similar.
Can't workout how to load a PDF image. PM me an email address and I'll send it to you.

8
Tech Talk / Re: Coil Ohms Readings
« on: July 19, 2018, 10:37:17 PM »
That is the resistance value for the top coil, the one hooked to the spark plug.
Ignition coils have 2 windings inside , primary or low tension and secondary or high tension.

9
Tech Talk / Re: Changing exhaust
« on: July 14, 2018, 11:01:30 AM »
Good question. Bit like going to doctors for a diagnosis without telling him the symptoms.
In other words there is no way to know unless it is a common bike and a common pipe, even then there are so many armchair experts you would get 50 different answers. 

10
Tech Talk / Re: Alluminium disc rotors, your thoughts?
« on: July 14, 2018, 10:53:41 AM »
l wonder if the rules about titanium are for cost reasons or safety? l remember there was a safety issue with axles.

Not to sure on the reason but I know if it isn't machined correctly with sharp corners and the like it is very prone to failure.

11
Wanted / Re: yamaha dt1
« on: July 12, 2018, 10:21:51 AM »
Be difficult to make a replica as they are made in 2 halves from memory. I have one that I'm not using but have no plan to sell at this stage.

12
Tech Talk / Re: Alluminium disc rotors, your thoughts?
« on: July 12, 2018, 10:17:22 AM »
Aluminum rotors for use on front of speedway cars. Could be a little to thick for some bike calipers though at 8mm.

https://www.speedwaymotors.com/Speedway-Front-Aluminum-Brake-Rotor-10-875-x-312-Inch,20054.html 

13
Tech Talk / Re: Alluminium disc rotors, your thoughts?
« on: July 09, 2018, 09:42:10 AM »
Alloy discs are quite common in open wheel speedway cars. Very critical to use the correct compound pads with them. Also using Titanium rotors now as well.
https://www.speedwaymotors.com/Wilwood-160-14185-Super-Alloy-Slotted-Rotor-10-Inch-6-x-5-25,268419.html
Not cheap but very light.

14
Yamaha / Re: YZ465H / YZ490 82 Piston Clearance
« on: June 20, 2018, 02:35:09 PM »
Service specs here.
http://vintage38.tripod.com/IT425_490.pdf

82 YZ 490 clearance listed as .08-.085mm or about .0035"

15
Maico / Re: Maico 400 Mega 2, whats it worth.
« on: June 12, 2018, 04:01:16 PM »
The dilemma is to try and sell or not. Always nice to get so money for a rainy day.

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