@Dedo With the repave the YDS is a crazy high pressure. Look for 35 min, don’t be afraid to run 40+!
My Son ran in 206 and Yamaha heavy in a handful of races on 3 different chassis. Tried removing front bars on the 2 chassis that had a front bar and it made it worse. The chassis’ that were ran wider than 52" rear track we used seat stay both sides. Our main chassis for 206 was an Ionic and has a soft axle while the others (206 MGB, KT Haase) I believe had what would be a Med.
I wouldn’t worry about the 32mm. If I was putting my Son in it, I’d show up with the front bar in, 38 PSI, get the rear around 53 if possible, send it and then pull the front bar and see what it does. Front bar in was worth a bunch for us
Maybe come spring we can be out there together and you can place chase with my Son, Randy.
I was expecting the YDS’s to be slippery, but had hoped to get some jacking and rotation. But that’s a lot to ask from that combo. Well, at least I’ll try it. I’ve got time to think of a game plan before hitting the track.
So, one thing to note is that the RA surface is like absolute glass after the repave. We were running like 18 PSI on YLC’s and MG Red’s. It’s like running a rain race out there.
With that in mind, what worked for us on that track was super weird. Super soft axle, for us it was a CRG 2, and I bent two of them in a weekend just from the curbs on the track. Our front bar was the stiffest one we had, super wide on the front track, basically everything we had just to get the front end to bite and turn in.
I also had a super narrow track width in the rear, and kept the seat struts in tight to try and get some rear grip on corner exit. That’s where I would think to start with the setup for that track but I have no experience with the YDS tires or a Kohler SS.
Yeah, I totally forgot RA was repaved, so yes to what everyone else mentioned on crazy high tire pressures and “rain” setups to get the kart to turn. We did the same when we were there last year and had good success with that.
I ran a Silverstone with YDS tyres oddly enough. I can’t recall exactly how the kart behaved (other than mild understeer) and set up changes, but I agree with James. Get the thing on the floor as to be honest it’s such an old chassis who knows where it’s gonna be.
Aside from the tires, I don’t think a 4stroke is going to work. I’d need to run outboard with a lot of engine offset. Plus, this is just a drum vs disc, my disc clutch can only run inboard.
This is using an old Tecumseh F200 block for eyeballing fit up.
I’m waiting to here back from SMC for size of the Vortex and info on it be run outboard, based on their website it can be done.
Any insite?
I made an offset plate for a PCR frame mount to do the same thing. It’s the wrong spacing for the Intrepid. The Intrepid is a flat mount, I’ll need an 8 degree for tire carb clearance. Odenthal has one that could work for offset. If that SMC can run outboard…maybe it’ll go.
I’d rather not mod the seat post, if it came to that point I’d sell and start over.
We can run a disc clutch in the Kohler class, clutch engagement is set between 4500 and 5000.
Ah good point on the Kohler. Sorry, i’m so used to seeing 206 as the four stoke on a kart.
Here’s something to consider while you’re making or buying a mount, although it’s written for the 206,it pretty much applies to all OHV four stoke engines in karting.
I share the same beliefs with running engine offset and a clutch outboard. In the past I did it because I had no choice with limited founds. Today, I have have the ability to make BETTER choices.
Ironically, part of this project revolves around a potential trade of an Ivander chassis of mine for the Kohler engine. The Invader (98ish model) is well suited to fit the task, and an even trade for the engine build. The Invader, myself and the engine builder have a history tying back to our Tecumseh Motorsports days.
Funny, as I’m typing this I’m also directing myself in making the BETTER choice.
Sell the Intrepid!
QPT has a new mount that might work for you. Jim at Faster Motors stocks them I believe. You might be able to bring the chassis over to his shop and mock it up.
Nope, not far at all. I’ve known Jim for years, back from the Karting Kettle days. I should ring him up, even if I scrap the plan for the Intrepid . Been awhile since we talked.
Well that settles it, I’ll be running my Invader chassis instead. SMC got back to me about clutch sizes. The two disc is 3" in length from the crank chamfer, three disc is 3.180". both are 4" in dia. They can be run outboard, but if done, neither of the two sprocket would be directly supported by the crank. Add the engine offset needed, it’s just not my best option.
The Invader is much better chassis for the tires anyway, just need to fork out coin for the engine rather than a trade.
