Let's talk about Seat Position

I’m 6 foot 2, I mount my seat even with the frame rails and 25 1/2 from the inside the front chassis tubing. 8.5 from the top of the seat to the axle. Margay told me I could move it back to 26 inches to give me more room if needed. Is your kart a limo? I have some long legs but they are no where near the steering wheel

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I think all of the Ignites are limos, but I could be wrong. I was hitting with the seat 1/4" above the bottom of the frame rail and the seat at 25" from the front of the front hoop. I realized yesterday after you posted that the measurement was supposed to be from the back of the front hoop. I was barely touching the bottom of the wheel but enough that I didn’t feel right going out like that.

My mis-measurement explains why I always had so much front grip. In the heat I always had to pull the front bar, and narrow the front up quite a bit compared to their baseline settings. I was a solid inch farther forward of where I should have been with the old seat.

I am going to move the seat back to 25 1/4" off the back of the front hoop and go with 1/8" below the rail and see how it feels.

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I have no experience with the front bar, but, in my experience with front tread width is that narrower always gave me more front bite. I’m pretty sure you’ll find that most have the same experience.

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You may want to ask margay on that, I have a brava limo. I always thought that the limo was just an option for us taller drivers. Being cramped up in a kart is no fun and super distracting. Move your steering shaft up if you havent already, that helped me. And remember margay told me I could move the seat back to 26 inches from the front without sacrificing performance!

I like @tjkoyen’s comment a lot. I’d agree that starting with the seat in a factory position is the best way to begin. Tuning go karts is hard! At least for me, sometimes. I’d say that moving the seat isn’t a first move, but if the kart isn’t responding to several adjustments, the driver isn’t comfortable, etc, why not consider it?

Go karts have so many great adjustments built into them - but the heaviest and most crucial component to consider is the driver. Why be wholly averse to considering their affect on the handling?

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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%

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I didn’t notice a total weight so I used 400 pounds. The corner weights may not match yours, but the percentages are still correct.

Total 400.00
Front 41.00 %
Left 49.40 %
Cross 51.00 %
Left Front % 19.70%
Left Front lbs 78.80
Right Front % 21.30%
Right Front lbs 85.20
Left Rear % 29.70%
Left Rear lbs 118.80
Right Rear % 29.30%
Right Rear lbs 117.20
Front Cross lbs 6.40 Difference Right to Left
Front Cross % 7.51%
Rear Cross lbs (1.60) Difference Left To Right
Rear Cross % -1.37%
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Close, 367.4# Min. weight for our class is 365#

Here’s my spreadsheet with the weights.

2019-09-27%2012_20_10-Kart%20Weight%20distribution

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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.

Have you seen this yet: 2009 Setup guide for IIntrepid Sirius, Cruiser, Maki and Chicco https://forums.kartpulse.com/uploads/default/original/1X/6fbd563d337234b7dc246cde0f42ac4d9e7fae50.pdf

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.

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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’ve been looking at those. They adjust for F/R bias, but not height. What is the 2ndary plate mount setup for the seat struts?

These are great to use. We can move the seat in 10mm increments very quickly. I wish they had vertical adjustment also.
67026003670__5BAF6622-CD29-42D4-9E8B-82E4E7851B72

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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.

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ikart had those 2D adjustable seat struts at one time. I’ll try to dig up a pic.

I guess it would be easy to cut a custom plate with the 10mm holes…

The plate would have for example a 3 x 6 holes with 10mm spacing between them. That’s for adjusting low / neutral / high positions.

You would only have to have a 10mm & 20mm extra "washer for the bottom fastening section.

no washer = low
10mm = neutral
20mm = high

“Washer”? You lost me.

Meant seat spacer. Didnt have the word before