Ended up grabbing a set of good scales and built a leveling table for them to get them all even.
Scaled the kart with the seat at 25 1/2" left side and 25 3/4" right side ended up at 41/59 F/R and 49.4/50.6 L/R. 51% cross weight.
I am 4# under weight so I threw a 6# chunk up front along the steering shaft support. Ended up getting to 42/58 and still the same 49.4/50.6 L/R. 51% cross weight.
I have lost 15# over the last 2 months, and hoping to lose another 5# which will let me throw another chunk up front to get me close if not dead on to their recommended 43%
Anyone have a seat position chart for an Intrepid FK4?! I am installing a DeepSeat to try to solve recurring rib injuries, no idea how the different shape will affect the install position…
If I can’t get a seat chart I will just try to replicate my old setup with the new seat, I was at least happy with that.
Not sure such thing exist. probably why they are fading away. I can barely find any information on Intrepid chassis nowadays, I have both Cruiser and Suzuka chassis, no setup guide, specially 4 stroke setup can be found. I think the best way is to try flash mount the seat with chassis rail and scale the kart to determine how much forward or backward you need to move.
Yeah, quite old one, he has a FK4 which is relative new chassis that is not included, also two shifter chassis are not included Suzuka and Silverstone.
There is an Australian firm at fastadjusters.com.au that provide innovative (and somewhat pricey) seat adjuster kits for many OEM frames. One of our excellent karter’s (and aerospace engineer) has installed a set and found them easy to use and very helpful in making quick changes to locate the ideal position.
I suggested a square plate that would allow a 2D hole configuration to Fast. Was told that it might be doable, but they weren’t pursuing it at the moment.
I know this is a very old post. But I am 6’1 with long legs. and the factory setting has me jammed against the wheel. I had to move the seat back about 6cm to even get some room for my legs to clear the wheel. Is that going to mess with the kart handling? am i just screwed for being tall? (i could be off about the 6cm, i moved it about a pinky finger’s length back)
yes you (we) kinda are. At that height it’s not easy and seat position will always be a compromise. Before moving the seat, you can also work on a couple of other areas…move the heels further in front so that your knees drop (you can take the heel stops out and move the pedals as far away as possible or consider a porch extension). Another area you can tweak is the steering column. Get a custom column support to get it more upright/away from you, use a spacer and/or a different steering wheel hub with less angle. Small tweaks can make you gain quite a bit of space so you don’t have to move the seat too far back.
Tough to say how much is too much, depends on the chassis/engine/seat/your weight etc…too many variables. I think you can get better advice here if you tell us at least what chassis/engine combo you are running and your weight
Some chassis will fit tall drivers better than others. My brother is 6’3”, so it’s always been a challenge to get him to fit comfortably without compromising performance. Higher HP classes will generally allow for a seat position that is farther back, but if you’re running a low HP class you may need to consider a front porch kit if Andy’s suggestions above don’t get you enough room.
i’m running a 2021 kosmic (otk) chassis and a ka100. one thing about the kosmic is it has vertical mounting struts for the bottom screws so you can only pull the seat back a certain amount. and i have the seat level with the bottom of the frame bars.
