Silver fox Manco

[madprofessor]

Upgrade to the 1” axle

I'm guessing Denny's referring to a 1" round solid steel axle, not another hexagonal, and I agree completely. I have no experience with hexagonal axles, sprockets, discs, etc., so I can't be sure about their available parts, but..................There's a nearly unlimited variety and sizes of sprockets and such for round axles, and available from any of the gokart parts suppliers, GPS, BMI, MFG, GKS, OMB, etc.
The gear ratio of a 60-tooth axle sprocket and a 10-tooth output sprocket on a 40 series TC would be a good call like Denny said, very standard 6:1 ratio for first effort with a 1/2" chain. A very standard set for 30 series TC's with 3/8" chain (#35) would be a 60 and a 12 (5:1 ratio), so the 60-tooth is sort of the standard to start any setup. I highly recommend you do it like this to start..................
1" Sprocket Carrier Sprocket Hub - GoPowerSports.com.......with this.......Split Sprocket #41/420 - GoPowerSports.com
1” DOUBLE SPLIT STEEL NEW CLAMPING SHAFT COLLAR BLACK OXIDE (Qty 4) Free Ship | eBay
You go split sprocket, you ain't never gonna knock it.

 

[Karttekk]

One problem I've run into with the hex axle is the wheels seize up from sitting and they're a bear to remove. I had to cut one axle off to remove a wheel. My neighbor came over with a bigger sledge hammer to pound the section of axle seized in the wheel. Working on one right now with a seized wheel. Use a lot of anti-seize on the axle if you pull the wheels for whatever reason. I don't have acetylene torches and a Bernz-o-Matic is useless as far as I'm concerned. Fun times!

 

[Karttekk]

Plus hex wheels are obsolete.

 

[Shwn2405]

These bolts should come out of these A-arms right ? I can get the nut off, but the bolt won't slide out.

 

[Karttekk]

Try running the kart with the nuts on the bolts but not tight. This will allow the bolts to hopefully vibrate or work loose enough to get them out. Soak them down with some good rust penetrant, the idea is to break the rust loose. Be aware of what's going, drive slowly.

 

[Denny]

Heat and beat. They will probably take some work to get out.

 

[madprofessor]

There's a zerk fitting in the middle of that A-arm. You could force a bunch of grease into it, see if the bolt will spin or wiggle its way out.

 

[Functional Artist]

These bolts should come out of these A-arms right ? I can get the nut off, but the bolt won't slide out.

I'd remove the grease fitting
...then, squirt some penetrating fluid (WD-40) in there
...& also, into each end too (where the bolt enters & exits)

Let 'er sit for a few (5-10 min)
...& then use an impact gun, with the appropriate size socket, ta try ta, get 'er ta "spin"

Plan B would be ta use a ratchet (or breaker bar) with a long section of pipe attached
...that additional leverage will add a lot of rotational force ta "break 'er loose

* If ya do any pounding or "beating" on it
...please install the nut first (just even with the end of the bolt)

This will give ya a bigger "target" ta hit
...& also, help ta keep from "boogering up" (technical term) the threads

 

[T.H.E Cat]

Keep your current gear ratio. You will love it. Upgrade to the 1” axle though it will be stiffer and stronger.

I sure wish I had changed over to the 1" round axle before I spent so much money on parts for my Hex axle. Parts these days for them are just about impossible to find, especially Rims and Sprocket carriers. Had to spot weld a round piece of pipe to mount the disc Brakes also. Yea, looks like he's got a 60 tooth sprocket.If you get another one make sure it's a split sprocket so you want have to take the thing apart to put it on or you can have it precision cut and make it a split sprocket. Just make sure you cut it in the right place. I would run a 10 tooth clutch making it a 6:1 ratio. If he's looking for top speed I would get rid of that torque converter and take the governor completely out also. He should have a really good kart when he finishes...

 

[Karttekk]

Surprised BMI Karts stocks a 6" hex wheel, not likely you have 6" rear wheels though.

Welcome to BMI Karts & Parts -

www.bmikarts.com

 

[Denny]

No do not go to a centrifugal clutch with that heavy kart. You will make it useless. Keep with a 40 series cvt.

 

[Shwn2405]

It's been awhile, finally getting her done. Stripped her down and about to paint her picked up some 22x11x8 tires that comes with the 4x4 rims. Bought some front hubs. I know I'll have to go with a more narrow front tire though. But for $80 used, I couldn't pass up. Got some gas shocks and here soon I'm going to start working on the rear axle and engine. Just have a questions for you men about valve spring. Trying to understand why you put high restraint valve spring on a engine, this is what I have gathered through research. Stronger the spring the more it pushes down the exhaust and gas valves. So the more rpm's you're pushing the higher the lbs on the spring so they operate correctly and don't "float"? Am I on the right path? Also, trying to decide on an engine. 420 predator or 459? Or the Duromax 440. Any input will help. Thank you

 

[madprofessor]

So the more rpm's you're pushing the higher the lbs on the spring so they operate correctly and don't "float"?

Failure of the valve springs to keep the lifters from staying in firm contact with the cam lobes is indeed the purpose of putting in springs that are stronger than stock. For example, I took out stock 10.8# springs from a 212 and put in 22# springs.
There's only a need for that if a governor is removed to allow for higher rpm. For example, the stock springs referenced above will start to "float" at somewhere around 5.5K rpm. Since a governor would limit the rpm to 3.6K, there's no need for stronger springs until governor removal. Stronger springs' # rating should be chosen carefully, like not using 28# springs when 22# will do.
FYI: Valve "float" is when the valve is pushed open by the rocker arm via the pushrod via the lifter when the cam lobe for that valve comes around. As the cam lobe passes by, the springs try to push up hard enough to close the valve while keeping the lifter from losing contact with the cam. If the rpm is so high that the cam lobe passes by so fast that the lifter "floats" away from it, well, that's valve float.

 

[Shwn2405]

Thanks mad for the detail description thinking once I pick the engine I'll buy a billet flywheel, rod, and stronger springs

 

[madprofessor]

billet flywheel, rod, and stronger springs

That's the magic trio, Shwn! The rod because stock ones can break and completely destroy the motor, the springs to allow for more rpm=more hp., and the flywheel because you changed the springs to allow more rpm.

 

[Denny]

Drive it stock for a while to break in the engine and learn how it operates before you mess with it.

 

[Shwn2405]

Can one of you two point me to a good YouTube video explaining what jets sizes to use with the carbs? I understand that when you put a new header on and air filter that the engine will have more air intake which means you need more gas intake to compensate. Is the jet size just a conclusion of trail and error on which jet makes the engine perform better? I just can't find a good in depth video about them.

 

[Denny]

What you will need to do is keep the engine stock until you are done breaking in the engine in once the kart is back together. If you take it apart you void your warranty. Then if you have a problem with the engine you can’t take it back. You get to fix it on your dime. After warranty is done then modify.
For figuring jetting after you modify the engine you will need to install a new plug. Drive it, then pull out plug and read it. White porcelain means it’s too lean. Black means it is too rich. Straw or tan means it is just right. You may have to chop the threads off the plug to see color. So have a few extra new plugs on hand. Do NOT buy a “racing” plug or the latest “trick” plug. They will not increase performance and may make it run worse. Stick with a stock plug.

 

[panchothedog]

If you buy a stage one kit from any popular kart shops which includes the parts needed to change to a low restriction air filter the proper jet is included.

 

[Shwn2405]

Thanks guys got the new hubs in today. Just wanted to see what it will look like