Petcock Mod - Pocket Bike Forum - Mini Bikes
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post #1 of 90 (permalink) Old 04-05-2008 Thread Starter
 
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Talking Petcock Mod

Here is how to do the petcock mod for the stock 49/47cc cags....

1: remove petcock from carb..
2: remove the small o ring from the bottom of the petcock
3: disasemble petcock
4: J-B weld the area where the white knob was
5: drill through the petcock where the fuel line is conected all the way to the bottom of the petcock where the little o ring was.(make shure you drill big enough so that you get good gas flow
6: put the little o ring back on the petcock
7: Put the petcock back onto the carb
8: install an inline fuel shut off valve

here are a few pics
Attached Images
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File Type: jpg DSCN1563.JPG (424.4 KB, 657 views)
File Type: jpg jbpetcock.jpg (37.4 KB, 954 views)
File Type: jpg DSCN1632.JPG (505.4 KB, 592 views)
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post #2 of 90 (permalink) Old 04-06-2008
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Re: Petcock Mod

Sikk! I was going to do a thread about this. Saved me some time! Thanks CPP!

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post #3 of 90 (permalink) Old 04-06-2008
 
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Re: Petcock Mod

Now I may be the only one out of the loop but what will this accomplish? Is it letting better fuel flow through the carb? If so, how?
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post #4 of 90 (permalink) Old 04-06-2008
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Re: Petcock Mod

No the petcock jams all the time so using jb weld and a drill you make it stay open and install an inline cut off valve to turn it on, and off. Instead of turning the white knob you turn a cut off valve its much easier!

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post #5 of 90 (permalink) Old 04-06-2008
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Re: Petcock Mod

Quote:
Originally Posted by Slayer0420 View Post
No the petcock jams all the time so using jb weld and a drill you make it stay open and install an inline cut off valve to turn it on, and off. Instead of turning the white knob you turn a cut off valve its much easier!
it also helps fuel flow. if your engine is highly modified and requires more fuel the petcock will be restricting too much fuel, so by completely drilling through it you get better flow.

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post #6 of 90 (permalink) Old 04-06-2008
 
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Re: Petcock Mod

Thanks for the answer fellas. Luckily this thread wasn't on the other day otherwise I would have done it instead of purchasing a two dollar fuel filter that fixed my problem, haha.
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post #7 of 90 (permalink) Old 04-06-2008
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Re: Petcock Mod

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Originally Posted by Lmidgitd View Post
Thanks for the answer fellas. Luckily this thread wasn't on the other day otherwise I would have done it instead of purchasing a two dollar fuel filter that fixed my problem, haha.

I would still do this mod or at least just leave the white knob on and use an inline shut off valve !

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post #8 of 90 (permalink) Old 04-07-2008
 
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Re: Petcock Mod

just a thought, who thinks that incresing the diameter of the fuel line its self would have an effect?
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post #9 of 90 (permalink) Old 04-07-2008 Thread Starter
 
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Re: Petcock Mod

no i do not think that will change much since the petcock itself is smaller thus restricting the line
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Re: Petcock Mod

I'm going to do the petcock on my spare carb today!

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Re: Petcock Mod

i fab'd a plate to cover the area where the knob goes, using the existing plate as a template and left the little holes inside. i used silicone gasket maker to seal it. bike runs good.

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post #12 of 90 (permalink) Old 04-08-2008 Thread Starter
 
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Re: Petcock Mod

yup and if you want more gas flow you can drill through bigger...
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Re: Petcock Mod

Quote:
Originally Posted by sizematters? View Post
i fab'd a plate to cover the area where the knob goes, using the existing plate as a template and left the little holes inside. i used silicone gasket maker to seal it. bike runs good.
I did that samething. I made a metal plate for mine and bolted it back into the petcock were the knob was but i have the JB under my plate.
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Re: Petcock Mod

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Originally Posted by Bighomedog11 View Post
I did that samething. I made a metal plate for mine and bolted it back into the petcock were the knob was but i have the JB under my plate.
Good idea guys! would look much better!

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post #15 of 90 (permalink) Old 04-08-2008 Thread Starter
 
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Re: Petcock Mod

I have to agree that some good thinking there fellas keep up the good work
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Re: Petcock Mod

Do you have pics of the plate mod you did to the petcock? Thanks.
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Re: Petcock Mod

And, CPParent, if I've got this right, after the JB Weld has cured then drill through the tube openings on the petcock valve so there is continuous flow through? Does anyone have photos of the drilling process? I just don't want to screw this up or my sons will kill me.
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Re: Petcock Mod

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Originally Posted by PaulEvan View Post
And, CPParent, if I've got this right, after the JB Weld has cured then drill through the tube openings on the petcock valve so there is continuous flow through? Does anyone have photos of the drilling process? I just don't want to screw this up or my sons will kill me.
yup after the JB weld has cured 24hrs. then get a dril bit thats the same size as the hole at the top then just drill it straight through on a drill press if you have one available. You really cant screw this one up
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post #19 of 90 (permalink) Old 04-15-2008 Thread Starter
 
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Re: Petcock Mod

yup thats right I use a 5/32 drill dont forget to take out the small seal at the bottom before you drill because it will rip if you dont take it off..
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Re: Petcock Mod

What does the small seal look like or are you referring to the small O-ring?
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