KT100 Tuning

Bill Faulk · Posted: Sat Aug 11, 2012 5:54 pm Post subject:

I don't have much history on the engine other than it was never run and it was blue printed from emmick. Does anyone have a good audio clip they can post of detonation so I know what it sounds like?

Walt right now I have an 86 tooth sprocket on the rear axel my concern of going larger is actually in clearance from the ground. It has less than 1/2 inch from chain to ground. Is there a fix to increase Clearance? I have already scraped the chain once.
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-Bill

TJ Koyen · Posted: Sat Aug 11, 2012 7:40 pm Post subject:

al nunley · Joined: 13 Nov 2006 Posts: 3027

Walt Gifford · Posted: Sun Aug 12, 2012 7:15 am Post subject:

Making a clutch adjustment or a gear change is a normal part of a race day. If you're paying $150 on clutch parts per race day I'd change something. Do you know which engine gear you have, how big is your track? 1/4 mile track 10th, 1/2 mile track 11th depending on turn density. With 13 psi in your tires you should have no problem with an 89th gear. If you're hitting the chain you might be running over curbs or putting a wheel off the edge.

Gif Cool

Bill Faulk · Posted: Wed Aug 15, 2012 6:21 pm Post subject:

I have some images to hopefully answer some questions and a status update. I have been a little sick so i did not make it out to the track on Tuesday.

I did however get the kart up and running on a stand. H was set to 1/4 and L was set at 2.5. Engine had a very clean sound to it, I could tell it was right on the verge of wanting to idle but was not.

I was going to try and set up the clutch (which i have not done and have NO experience in) but i forgot to charge the battery on the starter and it died. (very rookie mistake). I am going to keep the same gearing as many people have suggested to me and set my clutch for 8000 RPM. I have not counted the teeth on the clutch sprocket but i will soon.

I was only putting 11PSI in the tires so i will be increasing the tire pressure next time out on the track to 13psi. The tires are currently over 2 years old and have never been wrapped so i know they eventually need to be replaced but for now they are working.

I would also just like to say Thank You! to all that have offered their support and advice. I TRULY appreciate your time and patience.

First Image is of the exhaust pipe i did some research and it is an RLV 3 spec pipe. pipe Number RLV 7403. It has 3 holes in it which at the moment are partially covered. I can not find what (if any) Class this pipe works for in the 2012 WKA rule book. I can post a link of where it is being sold if more information is needed on the pipe. also if you zoom in you can see RLV 3 in raised print on the pipe. I have to make a new Bracket to hold the exhaust. The original mount clearly was not made for this exhaust.

The Second Image is the clutch and a side view of the header w with exhaust and EGT sensor. The tape that says "Clutch Needs Oil" is from when i took it to Swedetech and had them work on the clutch. They were unable to set the RPM so i must give it a go myself. Its something i need to learn how to do anyways. The clutch does have fluid in it.

Third image is the Carb and air intake box. you can see the clutch oil already coming out after i filled it.

The last is my new fuel tank and filter

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-Bill

John Mulvihill · Posted: Wed Aug 15, 2012 7:47 pm Post subject:

Hi Bill,

It sounds like you are getting there.

A couple things.

The carb setting you mentioned will not idle on the stand for very long. It is a rich setting that will give better acceleration coming out of a corner, but it won't idle (no accelerator pump on a kart carb- unlike a Holley). 3/4 0n the low will idle OK on a stand. Start the kart at one and open it up as you pull away on to the track.

If the EGT is mounted in the middle of the flex as it appears, it is too far away from the exhaust port in the motor. The best place is to mount it about half way in the header. A Digatron usually uses a 1/8th NPT thread on the sensor. My local hardware store has various 1/8th NPT fittings. I have bought a steel double female 1/8th NPT fitting, cut it in half, and brazed it on to the header to mount the sensor.

John
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I bowl overhand..........

Steve O'Hara · Posted: Thu Aug 16, 2012 12:27 am Post subject:

Bill,

Where are you in California?
If you are anywhere near Orange County I would be happy to spend a little time with you to get you up to speed on the setup of the kart.
Steve O'Hara

Bill Faulk · Posted: Thu Aug 16, 2012 10:12 am Post subject:

al nunley · Joined: 13 Nov 2006 Posts: 3027

[quote="Bill Faulk"]
I'm in the greater Sacramento Area. It would be a very long trip. Thank you for your offer.

[quote]
Cazll Terry Ives, he's been in this a long time and knows as much as anybody. He's in Folsom.
1-916-201-7707
_________________
If the data does not support the theory, get a new theory. (Al Nunley)
All else being equal; Compression is the Holy Grail.
45 years, in and around karting

Mike Arnold · Posted: Thu Aug 16, 2012 4:02 pm Post subject:

A Holley is car carb and Holley is the maker.

Mike

Walt Gifford · Posted: Fri Aug 17, 2012 8:02 am Post subject:

I would get a Walbro fuel filter. Those paper automotive filters give off fuzz that clogs the carb screen. The fuel line going to the carb should be safety wired to prevent an air leak which is a problem on these karts. That orange tubing gets rock hard pretty quick, I use Tygon tubing. Also, I'd put the other 3 bolts in the sprocket, if you put a wheel off the track it will be less likely to bend. The exhaust springs should wrap around from top hook to bottom not go straight across, you'll probably need longer springs for this. Don't know who milled those too big slots in the clutch support but I hope that don't break. There's a bolt missing in your chain guard.

Gif Cool

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FAA certified jet engine and aircraft technician
Nicholson Speedway class champion 2001
Yamaha KT100 Service Center
40 years karting experience

Bill Faulk · Posted: Fri Aug 17, 2012 11:08 am Post subject:

John Mulvihill · Posted: Fri Aug 17, 2012 2:42 pm Post subject:

Hi Bill,

Walt was talking about the springs at the header. "Spiralling" them works better.

One way of doing that is turning the pipe so it is pointing straight up, hooking up the springs and then turning the pipe level. Hook up the springs on the cradle last.

Ditto on the filter.

When you put the missing bolt on the TCI/chain guard, you might also want to wrap a tie wrap around the TCI. The TCI tends to break at the mounting ears due to vibration.

John
_________________
I bowl overhand..........

Sean Kisselbach · Joined: 04 Feb 2012 Posts: 18

Here is a pic of my kart with the springs twisted. I think i works much better then just having them connected.

Bill Faulk · Posted: Tue Aug 28, 2012 2:20 pm Post subject: