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Messages - pokey

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1
Tech Talk / Re: So what is the story with lowering transfer ports?
« on: April 20, 2019, 09:07:00 PM »
Lowering the transfers on its own does nothing as the effective size remains the same. If the piston was bevelled then the effective size /duration is changed. Id rather widen the port and repin the piston  if required and not play with the duration compression and head angles. The more you change the duration the more your existing pipe wont work.

2
General Discussion / Re: All electric soon ?
« on: April 03, 2019, 08:03:56 PM »
Not sure Im quite that ready to panic just yet. I was going to ask if anyone was old enough to remember lead in petrol though perhaps the question should be has anyone not killed off all their brain cells and can remember full stop.
We managed to get around the Lead issue in the fuel and the paint, The asbestos in the mufflers and brake pads and who knows what else tried to kill us us so electric bikes im not that worried about as its just another fad.
Sure they are replacing many IC vehicles, Asia is full of silent scooters and super car manufacturers are exploring the possibilities but as we know, they come at a fairly hefty price and they have the mentioned issue of a recharge grid being incomplete and I feel it will be just like 4G, Dead before the next fad  arrives.
Hydrogen seems to be the next contestant and wouldnt it be cool to have a 2030 model  injected two stroke  KX250HO

3
General Discussion / Re: Funnies/Jokes
« on: February 26, 2019, 02:34:18 PM »
Forest Gump is sitting on the end of Jennie's bed. His head in his hands sobbing. And Jenny says " Now Forrest, don't be upset, there is absolutely nothing wrong with having a small penis.

Forest looks up, sniffs and says. I don't know Jenny, I'd prefer if you didn't have one at all.

4
General Discussion / Re: This humidity
« on: February 07, 2019, 02:20:52 PM »
When you go north of around Ballina/Murwillimbah the humidity starts.  No use winding the windows up in the car during rain storms as your soaked with sweat in 2 minutes flat.
 
 You can tell how north you are by timing how fast your beer turns into sweat.L/Hr

5
Twinshock Trials / Re: Attempting to build a trials CT110 with grandkids
« on: February 04, 2019, 02:40:40 PM »
I met Gary McCoy a few weeks back. He has a cafe in the middle of nowhere otherwise called Cooyar. He does the odd school at Morgan Park but he does do off road courses at his property and.. he is an was into Trials in Europe. No one can slide a bike better than he can.

6
General Discussion / Re: Triumph bobber 2017
« on: February 03, 2019, 12:30:34 PM »
Doesnt make sense does it? I do mine every 5000 and filter at 10.
 My thinking is with modern engines  running hotter the oil would degrade sooner though perhaps with full synth stuff this isnt the case? Dunno but I like old school thinking .

7
Twinshock Trials / Re: Attempting to build a trials CT110 with grandkids
« on: February 01, 2019, 09:25:12 PM »
Looks like a good build though as a practical trials machine there would be better donors.
 
As mentioned the foot lever clutch is more an ancient mechanical quick shifter than a clutch, You cant really balance and hold the clutch in with a foot.
 The CT110 while a reliable thing has NO torque off the bottom. The new NB FI engines have a bit more on the bottom but still not enough to pop a wheel in the air no matter how much you try and its all because they share the same centrifugal/foot lever clutch. i rode one every day and they suck for slow technical stuff.

 Perhaps a donor SL70 could be the ticket.


8
Tech Talk / Re: Fuel resistant glue for bonding rubber to metal?
« on: January 30, 2019, 01:04:18 AM »
I'm guessing this is for the dt?
Many moons ago I had issues with a Suzuki ts cap that would leak. Suzuki use the hinged clam spring loaded style and it took awhile to work out why an extra rubber washer was causing issues. It didn't leak but it ran like a pig.
Under that internal spring plate was a sponge baffle and a small gap needed as a breather. The extra thickness cleared the gap.
I'm guessing again that the DT cap also has a breather system it needs to vent to atmosphere.  Something to think about.

9
Tech Talk / Re: Fuel resistant glue for bonding rubber to metal?
« on: January 29, 2019, 06:25:23 PM »
Yes definitely NOT the basic Silicone Threebond but the high temp RTV version.
Contact cement uses a hydrocarbon as a solvent and it turns to a Gel when in contact so not the best idea. All the Bootmakers adhesives use hydrocarbons as solvents(bootmakes choice, PVC adhesive and the rubber contact adhesives) .

What you could try is a cyanoacrylate (superglue/locktite) as its good for metal surfaces and nitrile rubber and does not use hydrocarbons as a catalyst. clean the surfaces well. This adhesive as you know is not flexible so i would try the RTV threebond first.

10
Tech Talk / Re: Fuel resistant glue for bonding rubber to metal?
« on: January 28, 2019, 07:42:18 PM »
You should have some three bond or the yamaha  sealant handy, That should do the trick.

11
General Discussion / Re: Plastic Guard suppliers
« on: January 20, 2019, 08:51:05 PM »
Postage from OS arrives at Customs for sniffing then sent to AP. The items are calculated and the amount is deducted from the amount of outgoing items to that country along with an invoice for services rendered.(Bit of a stink with customs wanting more for its services but) Every invoice for goods or services in OZ has GST.... unless its a cold bbq chicken.

 There are still parcels arriving from the US though not as many as usual. This could be the $ or other US businesses being effected, dont know dont care but there are a lot less .

 i didnt think anyone liked DC plastics as the colours were off and the orange peel finish, .. The PP stuff looks decent and you can buy it here.

12
Tech Talk / Re: Exhaust port height on Piston-port 250 ?
« on: January 12, 2019, 01:48:21 AM »
Im leaning to think that bore was always meant for grass track. Bassani's usually have a long belly section  that are good for enduro. Im also thinking a shorter belly would be the way to go but  trying what you have costs nothing . Good luck with the build.

13
Tech Talk / Re: Exhaust port height on Piston-port 250 ?
« on: January 11, 2019, 07:18:17 PM »
Good to be concerned. Raising the port  effects the port timing as your aware, This means the pipe needs to changed  so the returning charges from the rear cone can be timed to the port opening and closing. a Higher port also reduces the effective range or PB.

Plot the ports on a timing wheel or just a circle of paper with 360 degrees.  and look for 190. over that then your losing  unless you can increase rpm
Raising the port can increase HP IF it can do higher RPM as you lose torque but raised RPM cancels out the loss in power.

 In short, the pipe needs to be changed to suit the raised and changed port timing and the engine needs to be able to scream its head off.
 You could just suck it and see what it runs like with what youve got.

14
Wanted / Re: SR500E blinker
« on: January 07, 2019, 09:56:30 PM »
yeah is a bit of a pain to  post pics on the forum but it is what it is. I upload them to facebook these days and link from there . My dad says about computers" If I havnt needed to do it by now I wont need to know it tomorrow"

 Yours maybe more like this one.
 

https://www.ebay.com/itm/Yamaha-SR500-83-Front-Indicator-Chrome-Plated-QZ42001/170871514252?epid=858894518&hash=item27c8bc648c:g:EHkAAMXQfFJRSU5L:rk:8:pf:0

15
Wanted / Re: SR500E blinker
« on: January 07, 2019, 07:24:51 PM »
Maybe throw a pic up of the existing unit as they did change thru the years from chrome to black.  Are a few in england on ebay.

https://www.ebay.com.my/itm/INDICATOR-TO-FIT-YAMAHA-SR500-1978-83/280786715037?hash=item416031419d:g:~8MAAMXQjq5Q9R6l:rk:27:pf:0

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