[Mark Traylor]

David,
Do a google search for Sprag Clutch. Formsprag, Torrington, CSK are a few manufacturers. One way bearing is not really an accurate description. I use Fromsprag in helicopter transmissions.

[Mark Traylor]

MRC makes one quite similar

[Mark Traylor]

http://www.pktaxles.com/CH/SkidPlate.html

 

These

[Mark Traylor]

I use the thin stamped steel ones like the ones sold by MRC and PKT.  They bolt to the floor pan and not the chassis tabs.  That way you don’t bend chassis tabs, stiffen anything and they have more ground clearance and don’t bottom out as easily.

[Mark Traylor]

lettered cylinders have been around since 2011. still good and bad ones.

[Mark Traylor]

Aaron,

Mini on 1010 or 950 has always been a stepchild class.  Numbers have never been good.   The best at COA was about 19 and the 2014 shootout was only about 22 and that was a bigger turnout than grand nationals.  Locally it has been small damn near everywhere.

[Mark Traylor]

go to Acceleration karting and look at the exploded view diagram for the dellorto

[Mark Traylor]

IKF allows 250 twins two strokes

[Mark Traylor]

Some guys still run the 257 but parts are a bit scarce.   My buddy runs an Anderson with a 257 and still runs up front anytime he races.  It is still the best powerplant in singles outside of parts cost and availability.  It is better in performance than the CR 250.  The Formula ICE class (single cylinder) can use any 250cc 2 stroke motocross based engine.  It is pretty open but you are restricted in displacement, OEM parts and running gasoline.  We ran a modified 40mm delorto carb.

the CR500 is a moot deal.  Might be cool to use but it still isnt legal to run (based on displacement, not brand).  Comparing a modified CR500 on alcohol is not a valid comparison to an engine half the displacement, on gasoline and using all OEM parts.   Honda does not have a spec deal in superkarts, run what ever brand you want.  The honda is just common.   Eddie Lawson ran TZ250’s at about 105-110hp.  Others ran BRC, Hemmingway, or PVP in the twins.

Gas Gas ix not MX based so it runs in unlimited with the twins.

[Mark Traylor]

I have been away from superkarts for quite a while so some of my answers may be outdated.

1) CR500 isn’t legal.   2T engines limited to 250cc, 4T to 450cc.   Also we ran Rotax 257 singles, these engines produced in legal form for Formula ICE  (OE components except for a couple approved parts) 65hp to the wheel and they had a 6 speed transmission, the CR500 is only a 5 speed and doesn’t make a lot more power in a legal form.

2)  Gas Gas is great but not legal in ICE, you have to run it in unlimited and you will be racing against the twins at 105hp BRC and PVP engines.

3) We typically ran the wing at 0 angle of attack or a little negative in ICE.  handling is quite a lot different in my experience, run the rear narrow, no or very little ackerman,  more about rolling speed.  A slow turn is 65mph.  There is really a lot less chassis tuning going on.

[Mark Traylor]

terry ives has some new ones

[Mark Traylor]

That is a 250cc engine intended for superkarts.   they do nice work but not cheap .  The kit is over $4k but still needs a bunch of stuff, like a pipe and the english 250 pipes typically sell for $750 alone.

[Mark Traylor]

I agree with Christian.  we run cadets and seniors in LO206 on MG reds.  They work well and provide usable grip down to the cords.  When designing a race car or kart the first question asked before you design anything is “What tire will be used?”  the design grows from that.   No race kart is designed to be run on concession tires.  You need enough grip for the chassis to work.   They run Vega Blues in SoCal and they are good, more grip than the reds and probably bordering on a little too much grip for the low power engine.   Hoosiers are really high grip for them but I have heard that Hoosier is coming out with a new tire for the low horsepower classes.

[Mark Traylor]

If you had  like button I would push it for you last post Rob.  Thank you for the coverage and support for the grass roots karting that you provide.  Karting can not survive as a national level only activity.

[Mark Traylor]

I apologize to Rob Howden if I put words in his mouth, it was not my intention.

It is my personal opinion that Richard and Maxspeed as a whole have made some major mistakes this year that will hurt the program long term and has left a bad taste in my mouth along with many others.  Thank the karting gods for Briggs and Stratton, the amazing support from Curtis Ruth at Innovative Karting and Bernie Lacotta at Surfers Kart Parts for building the LO206 cadet program we have at PKRA.

 

[Mark Traylor]

Yes there is a big race happening.  Rob Howden’s site Ekarting news is without a doubt the world wide leader in disseminating karting news.  Maxspeed has chosen another site and the way Maxspeed went about that piece of business was quite crappy indeed so I can not blame EKN for not posting stories.   I do think that Rob will post what is sent to him but that is about it.  By the way…185 total entries with 10 classes….not such a big race.

[Mark Traylor]

John,

PKRA is a great track.  We race there with my son in LO206 cadet.  You are of a junior age and we have a great group of jumiors running in World Formula Junior,  The class is growing and competitive.  This weekend there is a great 2 day racing event called the Briggs and Stratton 4 Cycle Super Showdown.   You should definately come out and see what it is all about.  Curtis Ruth at Innovative Karting is a great supporter of the local grass roots karting effort and will do a great job of directing you to the equipment you need new or used.  As TJ said it is the best thing to buy a used kart and take advantage of the development that the larger karting companies have put into development, as simple as a kart seems there is a lot that goes into them from an engineering perspective and purchasing parts such as brakes, bearings, axle an bearing hangars would likely exceed the cost of a decent used chassis.   The LO206 is a great package and we have a cadet class that is on fire with that engine, there is also a growing adult LO206 class as well but the juniors are all running the World Formula engine.

 

Mark

[Mark Traylor]

Sorry but I would say it is worth nothing.   It is too old for anyone to want for racing and you can get a hobby kart that is much newer with an engine more appropriate for a hobby kart pretty darn cheap.   It is also not nearly old enough to be a vintage kart so no dice there.  I just bought a very nice and super clean early 90’s Invader with front brakes and a running yamaha engine for $150.

[Mark Traylor]

I believe it is a very old and well beaten CRG Heron.

[Mark Traylor]

Yes.  I agree Chris.  When Chaz Lemmon first got the 450 and had Johnny Green driving it that was the whole concept.  Run it stock and reliable.  We ran one bone stock at Laguna with the world superkart races one year and Johnny ran second in the single cylinder class even being down on power.  It was easy to drive with tons of torque (it was doing a wheel stand out of turn 3).  In NCK races Johnny was unbeatable in the 450 or 250 2T.  All the mod 450’s killed the whole deal.

[Mark Traylor]

Starting in 1994 I was involved in racing 250 road race karts with Terry Ives in NorCal.  When the CRF 450 came out my team owner had an association with Honda through a driver that drove the kart a lot.   They gave the team a couple CRF 450 engines.  They were great, easy to tune and dead reliable, but definately down a power to the 250 2 strokes.  It wasn’t awful, do to the power band we still won most of the time only a really good driver in a really good 2T could beat us.   That being said when the average driver got a 450 they were slower.  The engines started to get modified, then they became very unreliable and very expensive.   The program in Sonoma is definately different as the engines are controlled by the owner HPD.

 

[Mark Traylor]

Scott,
I hate to ask but did you ruin your crank?

[Mark Traylor]

Listen to Riley.  He knows his shit.  Between Riley and Terry Ives they can provide everything you need.

[Mark Traylor]

call Terry Ives in Sacramento.  He knows all things rotax outside of rotax max

[Mark Traylor]

Glad NCK had a great race on the new pavement.    NCK actually had the very first event on the track when first built on the brand new pavement.   Awesome time then.   I was running the Formula Swift Supercup series with Terry Ives and Chaz Lemmon.   The 250’s were blistering front tires terribly on the new asphalt.  Terry pulled out a big lead but barely won in the end because the right front had 2/3rds of the tread pull off the tire.  I have never seen a kart shake so hard in my life but he kept the win.   that was spring of 1996 by the way.

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