Author Topic: APS/G 250 2 Stroke in the Land of Oz  (Read 60728 times)

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Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #60 on: May 08, 2013, 01:50:34 AM »
Hi Freud

It's been a bit quiet as I will be doing a big interstate move in about 6 weeks.

I have been doing a bit of limited "Porting" work on the "Modified Cylinders" for the next stage 250cc engine so I can run the Lectrons on this engine as well as the 350 Class engine.

The RGV engine is a Production Road Engine and is limited in how much power it can make, ( that's compared to Late Model Honda RS or Yamaha TZ 250 cc Road Race engines ).

But these mods will hopefully get everything working in a way that it was intended. Exhaust Pipes, Higher Comp Heads, Carbs and the Sunoco Gasoline.

I just finished these cylinders today and now have,
 
.9mm skimmed off the top so they are like Suzuki "Race Kit" barrels and I can use Suzuki Race Kit 1.4mm gaskets that raise the port timing and still use all the Heads/Inserts that I have.
 
Exhaust Ports widened 4mm on the Ears.  This is one area in these engines that can benefit from a little opening up


 
Entry to the Transfer Ports altered to eliminate the sharp entry, it has been found that you can gain power by having more rounded entries on the base of the cylinder instead of the previous Knife Edge dividers.

Before

 

Modified


 
1 mm wider and deeper on the entry to the Aux Transfer Port.

I have now done a bit more tidying up today and the Cylinders will now need re-plating.
 
3 possible things will happen: Nothing at all or I will gain HP or they’ll be stuffed. I rang the local Betting Store to see what odds I can get on the second outcome and it came in at 100:1 :-D
 
Pete


The Mission is to go as fast as possible along on that old Road Less Traveled.

Offline tauruck

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #61 on: May 08, 2013, 04:58:59 AM »
Put a hundred on it. You could come out smiling :-D

Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #62 on: May 08, 2013, 08:09:44 AM »
Put a hundred on it. You could come out smiling :-D

Got to be in to win it  :cheers:
The Mission is to go as fast as possible along on that old Road Less Traveled.

Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #63 on: May 30, 2013, 01:22:03 AM »


A belated post but this was how it looked it looked down there in Feb.

I was hoping the Red would have given me a few more mph but it was not to be.
I am looking forward to the next run.:cheers:

Pete
The Mission is to go as fast as possible along on that old Road Less Traveled.

Offline wobblywalrus

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #64 on: May 30, 2013, 01:48:24 AM »
Pete, will you be bringing and running both engines, the 250 and the 350?

Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #65 on: May 30, 2013, 03:45:03 AM »
Pete, will you be bringing and running both engines, the 250 and the 350?

I am still undecided at this stage. I only have a few small things to do so that is an easy swap. Having the 2 years rained out upset the long term planning a bit, but I did manage to accumulate most of my parts over that time so now it's mix and match over a few Classes.

I do have another 250 V twin 2 Stroke, I picked up really cheap last year. It's a pretty Ratty looking early Honda NSR 250 (Road Bike), and to my surprise the engine looks ok. It is being tidied up and prepped for M-G 250 duty with the stock standard engine set up, I have unfinished business in that Class.

The Honda NSR's are harder to get parts for than the RGV. The research I have done suggests that I can probably get more power from the Honda as they have a different bore and stroke to the RGV, but at a price. A work in progress.

One way or another I am looking at running two Classes in 2014. The easiest option is to have a crack at APS-G-250 on the RGV/Aprilia and M-G-250 on the Honda, both of these Records need attention, I made sure I built the Trailer for two and I will be living a lot closer to Lake Gairdner next year :-D

Pete :cheers:


« Last Edit: May 30, 2013, 03:50:22 AM by SaltPeter »
The Mission is to go as fast as possible along on that old Road Less Traveled.

Offline Freud

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #66 on: May 31, 2013, 01:56:35 PM »
I thank you for your reply. I just hadn't opened this thread for a while but I am

impressed with your effort in a class than many people overlook.

I'll stay in touch.

FREUD
Since '63

Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #67 on: July 11, 2013, 06:08:15 AM »

A carry over from the 250 records post.

This is an Aprilia RSW250 Road Race Engine, it has two cranks geared together. A very High Maintenance Race Engine



This is my Aprilia RS250 Road Bike engine (ignore the Lectrons :-)) and is basically a Suzuki RGV VJ22 with different cases, and is what I ran at Speedweek this year. Two very different engines in so many ways, but mine is just a plain old fashioned High Maintainance 2 Stroke Road engine  :-D :-D.



Pete
The Mission is to go as fast as possible along on that old Road Less Traveled.

Offline Freud

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #68 on: July 11, 2013, 11:44:41 AM »
I hope that this upcoming move doesn't kill the year.

Best to you, Pal.

FREUD
Since '63

Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #69 on: July 11, 2013, 05:16:15 PM »
I hope that this upcoming move doesn't kill the year.

Best to you, Pal.

FREUD

No Freud, everything is on track.

Pete
The Mission is to go as fast as possible along on that old Road Less Traveled.

Offline wobblywalrus

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #70 on: July 11, 2013, 08:10:05 PM »
Do you guys remember when a 250 was a big bike?  That was a long time ago when we buzzed around on 50's and 90's.

Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #71 on: July 12, 2013, 05:09:59 AM »
Do you guys remember when a 250 was a big bike?  That was a long time ago when we buzzed around on 50's and 90's.


Yep I remember

I had one of these




And then another one




Then this  8-)




Pete  :cheers:
The Mission is to go as fast as possible along on that old Road Less Traveled.

Offline Graham in Aus

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #72 on: July 12, 2013, 06:46:41 AM »
1978, my RD and G/F!



Memories !  :-P

Offline generatorshovel

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #73 on: July 12, 2013, 08:52:13 AM »
My young days started a little "different"



I was stoked when I was pulled over by the boys in blue for doing 71 mph in a 35 zone, SO happy in fact, the cop refused to put the speed in writing (ticket)

No one ever believed that speed  :cheers:

Tiny
Tiny (in OZ)
I would prefer to make horsepower, rather than buy, or hya it, regardless of the difficulties involved , as it would then be MINE

Offline wfojohn

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #74 on: July 12, 2013, 12:10:43 PM »
Pete

The pic of your red bike and leathers a few posts above, is that from B'ville or a place in Australia? The salt on the tires etc looks like Bonneville but you said the picture is from February. If its Australia I did not know there is a salt lake there.