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Author Topic: APS/G 250 2 Stroke in the Land of Oz  (Read 61032 times)

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Offline wobblywalrus

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #90 on: November 04, 2013, 01:23:00 AM »
A lot of us like the smell and sound of those two strokes.  They are something we do not get to hear very often any more. 
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Offline tauruck

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #91 on: November 04, 2013, 02:53:13 AM »
There is no better sound IMO. BTW, I have two kart motors here that we used to run in 100CC Supers Class. It was the class world championships were decided on. These puppies used to scream to 20,000RPM.  :-D :-D :-D That's a nice sound.
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Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #92 on: November 04, 2013, 02:40:02 PM »
Bo and taruck

Good to hear,

taruck I used to be briefly involved in Karting and I remember that sound,

My first involvement with Smokers came from Trail Riding and moved to racing mainly Dirt Track and a little MX in the 70's.

I started racing a "Race Kitted" Suzuki TS125 and then the only Brand New Vehicle I have ever owned a 1975 Honda CR125M Elsinore, amazing Bike in it's day.

Good Times and more still to come  8-)

Pete
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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 #93 on: November 04, 2013, 03:52:46 PM »
Pete, It was a 250 Elsinore that got me hooked. One ride and it was all over. I've never owned a Honda and I still remember when in the late 70s the Red Rockets arrived at the track. The rumour was that all us guys on the RM125s were dead men.
 
I did do some porting on RDs in the 80s but it got out of hand. I did two sets for friends and everyone else thought it was FREE!!!.
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Offline bak189

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #94 on: November 04, 2013, 06:20:02 PM »
Two strokes....never did well racing them....I can get a four stroke to run....two stroke not so good......so I got Rotax to put a outstanding engine together, 125c.c. rotary valve, made one fast run at` 143mph....stuck the piston, so no record .....rebuild the unit....have complete bike for sale.....................
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Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #95 on: November 04, 2013, 08:06:24 PM »

Tauruck, a mate of mine has still got four 1972 -73  Elsinores - 2 x 125s and 2 x 250s  One of the 250s is fully restored to Original it is indeed a beautiful thing. I really wanted a 250 but lacked the $, nothing has changed  :-D

Quote from: bak189 on November 04, 2013, 06:20:02 PM
Two strokes....never did well racing them....I can get a four stroke to run....two stroke not so good......so I got Rotax to put a outstanding engine together, 125c.c. rotary valve, made one fast run at` 143mph....stuck the piston, so no record .....rebuild the unit....have complete bike for sale.....................

bak, I am on a pretty steep Learning/re Learning curve with mine. I have a fundamental understanding but the in depth stuff is a bit over my head.

The old stuck piston is way 99% go bang.

Because of this I set it up with a rich baseline jetting and try and maintain 1100 - 1150 F on my EGT if I need to make a change,

and still use the Suzuki Oil Injection System, this puts the oil directly onto the bearings and the front of the Piston.

But I always ride with my hand on the Clutch Lever  :-o

Pete

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Offline wobblywalrus

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #96 on: November 04, 2013, 11:24:57 PM »
The four stroke dirt bikes have evolved to have extremely oversquare engines with very short pistons.  It takes a lot of expensive maintenance and periodic parts replacement to run them competitively.  Plus, they have peaky power and are difficult to ride.  A lot of racers in Oregon buying two strokes now.  They are simpler, more reliable, cost much less to run, and are easier to ride.
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Offline tauruck

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #97 on: November 05, 2013, 12:16:26 AM »
Bo, are there all the go fast goodies for those four strokes?. There must be a pile of stuff to make them less reliable. I've never ridden one but it must be sweet coming off a tight turn and getting an immediate handful of power.
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Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #98 on: November 05, 2013, 12:43:14 AM »
It sounds like the Dirt Bikes have gone full circle, oh no.

I thought you got a Four Stroke because they were more reliable, lol.

Pete
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Offline wobblywalrus

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #99 on: November 05, 2013, 01:41:05 AM »
Mike, yes, they make all sorts of stuff to make them even more unreliable.

The short and very wide pistons wear and rock in the bores.  Then, they crack and break.  The guys that buy these bikes expect them to wear out and lose compression and not to explode.  Burning oil and bad performance are what tells them a rebuild is needed.  They do not always get this indication with these new bikes. They run great then Bam, it is all over.

A well designed two stroke with good materials like a KTM can give a long life.  They are in a different league, reliability wise, than the typical oriental two stroke.   
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Offline tauruck

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #100 on: November 05, 2013, 05:59:34 AM »
Peter, you're on a good thing there. Stick with the oil burner. :-D
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Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #101 on: November 05, 2013, 11:59:55 PM »
I'll be sticking with the Smoker cause it started after a few kicks, no push button here.

It idles and free revs as well what a bonus  :-D

Pete  :cheers:
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Offline tauruck

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #102 on: November 06, 2013, 12:06:50 AM »
Pete, that sounds like Shane Warne!.  :cheers: :-D
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Offline SaltPeter

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #103 on: November 06, 2013, 07:30:01 PM »
Shane who??? lol

Pete  :cheers:
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Offline grumm441

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Re: APS/G 250 2 Stroke in the Land of Oz
« Reply #104 on: November 06, 2013, 09:27:12 PM »
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