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 Post subject: New to World Formula
PostPosted: Mon Dec 21, 2015 1:28 pm 
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Joined: Sun Nov 08, 2015 7:42 pm
Posts: 20
Hi Folks,

I'm new to Karting and 4 stroke engine and recently got an older Rocket kart with WF engine.

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My noob questions:
1. Judging from the head casting, it looks like the block is from is from Gen 5, but not sure about the internal. It also looks like it has PVL system.
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The valve cover though indicate that it is gen 1.

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2. What is the idle RPM and at what temp?
2. I started the engine cold with choke close, but when it got warm (223F or so) it stalls when I open the choke. Is this normal?
3. I was adjusting the idle mixture screw and it seems like the highest RPM I can get is about 200-300 RPM from the RPM at specified idle speed. Is this normal or should I see a bigger jump.
4. What is this box for, If this making a connection to the switch the engine won't start at all but if I disconnected from switch the engine starts right away every time. Is this because I have PVL?
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5. I just rebuild the brakes but I think I have leaky master cyclinder. Anyone has spare master cylinder that I can buy?

Here is the clip of engine running.

https://youtu.be/ChhECR8LN3k

Thank you for you guys help.


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 Post subject: Re: New to World Formula
PostPosted: Wed Dec 23, 2015 11:38 am 
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Joined: Tue May 31, 2011 11:37 am
Posts: 63
Kart #: 74
Chassis: Birel
Class: World Formula
Club: PKA
Sounds to me like you have some plugged jets. Take off the float bowl and check the jets (2) to make sure that they aren't plugged.

Cheers,

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 Post subject: Re: New to World Formula
PostPosted: Wed Dec 23, 2015 5:33 pm 
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Joined: Sun Nov 08, 2015 7:42 pm
Posts: 20
bzflagace wrote:
Sounds to me like you have some plugged jets. Take off the float bowl and check the jets (2) to make sure that they aren't plugged.

Cheers,


Are you referring to question #2 about stalling when choke is open?


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 Post subject: Re: New to World Formula
PostPosted: Mon Jan 04, 2016 11:21 am 
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Joined: Thu Apr 21, 2005 12:46 pm
Posts: 981
Your motor started as a GEN 1 but was likely converted. I can't tell the Generation of the Block by your pics, determining the generation requires visual of the front and back of the block. The number of ribs and a couple other markings are the determination.

The box is the Generation 1 rev-limiter. It is no loner functional/needed with the PVL Upgrade.

You should be able to adjust the idle from about 1000 rpms to about 3000 rpms with the idle adjustment screw. However, the air bleed screw may be way out of adjustment affecting idle performance. Your idle jet in the float bowl may also be plugged, VERY common, especially with an engine that has been stored for some time.

As for the choke, there are three positions, Full choke, partial, and off. Pushed all the way DOWN is the off position. The W/F uses full choke for initial starting/getting fuel to the float bowl. Almost immediately after starting, the choke should be moved to the partial position, and then after about 30-seconds it should run with no choke with an idle at about 2000 rpms.

Hatch


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 Post subject: Re: New to World Formula
PostPosted: Tue Jan 26, 2016 5:43 pm 
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Joined: Sun Nov 08, 2015 7:42 pm
Posts: 20
What is the best gearing for Pat's Acres and Mac for this WF kart?


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 Post subject: Re: New to World Formula
PostPosted: Wed Feb 17, 2016 11:42 pm 
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Joined: Thu Aug 11, 2011 2:37 am
Posts: 218
Kart #: 8
Chassis: Rocket RK2-125
Class: CR125/Shifter
Club: PKA
It Depends on what chain/sprocket your running....if it has a stamp on the chain somewhere it will read either #35 or #219. We can help once you determine what you have. There is a lot to learn so be patient and just ask as you go. I would also ask if this WF has a starter on it? Even if it does not...the flywheel has a plastic starter gear attached to it....replace it.... if it breaks it can take out your coil. It is not expensive but they get brittle over time.....Edit: overlooked the pic and vid...looks like yours is not there...either way there used to be a rule that the ring gear had to be there...not sure anymore...someone correct me if I'm wrong.


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 Post subject: Re: New to World Formula
PostPosted: Thu Feb 18, 2016 7:22 pm 
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Joined: Sun Nov 08, 2015 7:42 pm
Posts: 20
kkeller14k wrote:
It Depends on what chain/sprocket your running....if it has a stamp on the chain somewhere it will read either #35 or #219. We can help once you determine what you have. There is a lot to learn so be patient and just ask as you go. I would also ask if this WF has a starter on it? Even if it does not...the flywheel has a plastic starter gear attached to it....replace it.... if it breaks it can take out your coil. It is not expensive but they get brittle over time.....Edit: overlooked the pic and vid...looks like yours is not there...either way there used to be a rule that the ring gear had to be there...not sure anymore...someone correct me if I'm wrong.


My output sprocket is 71 with 16 on the clutch. Talking to folks, this is a little too much. I'll see what it does when I go for practice at PARC.


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 Post subject: Re: New to World Formula
PostPosted: Thu Feb 18, 2016 8:37 pm 
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Joined: Thu Aug 11, 2011 2:37 am
Posts: 218
Kart #: 8
Chassis: Rocket RK2-125
Class: CR125/Shifter
Club: PKA
What chain do you have? ....


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 Post subject: Re: New to World Formula
PostPosted: Fri Feb 19, 2016 10:47 am 
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Joined: Sun Nov 08, 2015 7:42 pm
Posts: 20
kkeller14k wrote:
What chain do you have? ....


#219


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 Post subject: Re: New to World Formula
PostPosted: Fri Feb 19, 2016 4:52 pm 
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Joined: Wed Sep 23, 2009 5:33 pm
Posts: 326
Location: Rock Creek
Club: PKA
I recall running a 4.15 - 4.25ish gear ratio at Pat's? 4.25 would be 16 & 68 gears, 4.125 = 16/66. If you can't get 219 gears that small then get a bigger sprocket (17/72 = 4.24)

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 Post subject: Re: New to World Formula
PostPosted: Sat Feb 20, 2016 2:42 am 
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Joined: Thu Aug 11, 2011 2:37 am
Posts: 218
Kart #: 8
Chassis: Rocket RK2-125
Class: CR125/Shifter
Club: PKA
OK...... now that is over. Here is what I can tell you...GOOGLE it!.... cutpriceracing has a great explanation on it...a lot of peeps run the #35 but I ran a #219 myself....It had a lot to do with the rev limiter....and that's another story. Just remember (1) tooth can make a difference how it works....oh and what direction they run at Mac...when you get that chance...Pats is one way always....Mac is another story.


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 Post subject: Re: New to World Formula
PostPosted: Sat Feb 20, 2016 10:18 am 
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Joined: Sun Nov 08, 2015 7:42 pm
Posts: 20
MrMoody wrote:
I recall running a 4.15 - 4.25ish gear ratio at Pat's? 4.25 would be 16 & 68 gears, 4.125 = 16/66. If you can't get 219 gears that small then get a bigger sprocket (17/72 = 4.24)


That's exactly what I'll do on mine. I have 64-71 sprocket. With 71 and my weight class, it seems like it is too much as I go thru the power band too quick. 64 is too slow, 68 is just right I think. Once I got my Mychron transmitter and seat time,I'll know better.


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 Post subject: Re: New to World Formula
PostPosted: Sat Feb 20, 2016 1:43 pm 
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Joined: Sun May 11, 2014 12:01 pm
Posts: 26
Kart #: 28
Chassis: Arrow
Class: WF Heavy
Club: PKA
Welcome to World Formula. It is a good group of racers who are willing to help out, answer questions and offer an occasional bit of advice. Mr. Keller is correct, there are a lot of variables that will impact your gear ratio choice. Weather, track conditions, etc. I checked my notes from the past two years and show that for Pat's my final drive ratio ranged from 4.11 to 4.22. For MAC it ranged from 3.83 to 4.00. I always have my starting ratio for each track and then make changes through the day as needed. Suffering from short and long term memory loss I keep notes of my starting point and all changes for each session. It helps later on if you get too far off the set up. Good luck, looking forward to meeting you. Michael #28 WF


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 Post subject: Re: New to World Formula
PostPosted: Sat Feb 20, 2016 9:08 pm 
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Joined: Sun Nov 08, 2015 7:42 pm
Posts: 20
Cheap Thrills wrote:
Welcome to World Formula. It is a good group of racers who are willing to help out, answer questions and offer an occasional bit of advice. Mr. Keller is correct, there are a lot of variables that will impact your gear ratio choice. Weather, track conditions, etc. I checked my notes from the past two years and show that for Pat's my final drive ratio ranged from 4.11 to 4.22. For MAC it ranged from 3.83 to 4.00. I always have my starting ratio for each track and then make changes through the day as needed. Suffering from short and long term memory loss I keep notes of my starting point and all changes for each session. It helps later on if you get too far off the set up. Good luck, looking forward to meeting you. Michael #28 WF


look forward for the April 17th race! My kart is old and this is my first time, so I will need to learn the rope for sure. I'll be trying out either Senior or Master (40 and above).

So far I've done:
1. Clean the carbs, adjust the float, and replaced gaskets.
2. Replaced all fuel line and added by pass.
3. Replaced throttle cable.
4. Replaced exhaust and valve cover gasket.
5. Adjust the valve clearance.
6. Oil Changed.
7. Rebuilt Master Cylinder and calipers.
8. Updated the engine cover and kill switch.

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 Post subject: Re: New to World Formula
PostPosted: Sun Feb 21, 2016 12:20 am 
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Joined: Thu Aug 11, 2011 2:37 am
Posts: 218
Kart #: 8
Chassis: Rocket RK2-125
Class: CR125/Shifter
Club: PKA
Your success is what makes this the sport what it is...if no body comes to play then why do it? All of these people here are good on their word and you to.... will become part of a culture...a race family and you won't find a better competitive sport than this....lets get you on the track and out there doing seat time. I have had a rocket WF so if you have questions...just ask...BTY...we need to get you a set of pills for your front end and then we will teach you how to align it....but that's another curve to visit...cusoon.


Last edited by kkeller14k on Sun Feb 21, 2016 12:29 am, edited 1 time in total.

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