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| High Performance Bicycle Engine Tips We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. |
Stock carb mod
Discussion at Motorized Bicycle Engine Kit Forum in the High Performance Bicycle Engine Tips forum. Originally Posted by Egor
A quick intake timing mod. I use this in a pinch, works well. A pic is ...  | | 
09-08-2008, 08:58 PM
|  | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Cropwell Alabama
Posts: 144
| |  Re: Stock carb mod
Quote:
Originally Posted by Egor  A quick intake timing mod. I use this in a pinch, works well. A pic is worth a thousand words. Have fun, Dave | This really caught my eye. Could you give a little more detail about this. How much do you grind off the piston skirt? Does this increase the air/fuel flow to the cylinder? It looks like a great mod. Thanks for any elaboration you can provide.  |
09-08-2008, 09:19 PM
|  | Master Motorized Bicycle Builder | | Join Date: Jun 2008 Location: Independence MO
Posts: 275
| | Re: Stock carb mod
Quote:
Originally Posted by Egor This is an easy carb mod I use for all my engines that I still have the stock carb on. Start by removing the carb and take the slide out. Next take the float bowl off and get the float out of the way, I remove the main jet holder also. put a .040 drill in a Dermal or a small drill motor and, on the engine side of the under side of the carb, directing as far as you can in the direction of the air flow, hold the drill at a 45 degree angle with the drill in the direction of air flow, drill the .040 hole. Next insert the slide and look to see where the hole lines up with the edge of the slide, if you are good it is in the middle, no worry if not. Make a small slot in the slide over the hole, so that most of the air the engine will run on will come out of the float bowl. I think you will enjoy the results, my bike will idle down and run up with no faltering at all. I will post some pic's to explain. Good luck and have fun, Dave
PS: You will not have to mess with the slide needle as much, I keep it in the stock position. | A step by step photo group would be nice...
__________________ _________________________________________________ It's a mathematical fact, 10 out of 8 people have trouble with fractions. Kings 70cc 3200+ miles. Now on a Schwinn Point Beach. (And say HI to my Dad, he works there in the Archives!) |
09-10-2008, 01:51 AM
|  | Master Motorized Bicycle Builder | | Join Date: Jan 2008 Location: Long Beach Ca
Posts: 380
| | Re: Stock carb mod
OK I will get a set of pics up to enplane in Photos. I know it is worth the effort. The mod is to fetch air that contains fuel in it, as the carb for these simple engines is missing a slow speed circuit. Have fun Dave
__________________
Chuck - The monkey has the spark plug again!
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09-11-2008, 11:26 PM
| | Master Motorized Bicycle Builder | | Join Date: Sep 2008 Location: black mountain NC
Posts: 152
| | can you guys seee this?
this is what I did with mine
I smoothed out the entry & actually honed the bore as large as I could without interfeering with the sides of the slide
it definatly helped
take care
JAK |
09-12-2008, 04:46 PM
|  | Master Motorized Bicycle Builder | | Join Date: Sep 2008 Location: Lima, Peru
Posts: 123
| | Re: Stock carb mod
Interesting
What is the bore diam in that pic?
And what is the stock bore diam?
Thanks in advance |
09-12-2008, 05:18 PM
|  | Master Motorized Bicycle Builder | | Join Date: Jun 2008 Location: Longmont, CO
Posts: 1,390
| | Re: Stock carb mod
I thought about doing that the other day when I had the carb off. Didn't do it as I don't have the proper dremel bits. |
09-13-2008, 03:25 PM
| | Master Motorized Bicycle Builder | | Join Date: Sep 2008 Location: black mountain NC
Posts: 152
| | Re: Stock carb mod
well :-)
all I can say is that I could get my pinky much further into either side of the carb when I was done but I dident really measure it
I used some of the tools I use for porting heads on cars with
the pic is terrible
I did use the solder & drill method on the fuel jets & got the thing dialed in really well at lower speeds but I used to be able to get it to clean out much higher in the RPMs & thats where my speed came in
so Im hopeing for that too
have a great weekend
JAK |
09-13-2008, 04:47 PM
| | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Cropwell Alabama
Posts: 144
| | Re: Stock carb mod
Quote:
Originally Posted by Egor A quick intake timing mod. I use this in a pinch, works well. A pic is worth a thousand words. Have fun, Dave | Hey dave, does the shaved piston skirt go on the intake side or both. If you shave it to much will it cause the engine not to start. I just re assembled mine and it will not hit a lick  . It has good fire and is getting fuel. It just will not hit. Any suggestions would be appreciated. Thanks, Mike. |
09-13-2008, 06:06 PM
| | Master Motorized Bicycle Builder | | Join Date: Jun 2008 Location: Independence MO
Posts: 275
| | Re: Stock carb mod
Quote:
Originally Posted by Biker Mike Hey dave, does the shaved piston skirt go on the intake side or both. If you shave it to much will it cause the engine not to start. I just re assembled mine and it will not hit a lick . It has good fire and is getting fuel. It just will not hit. Any suggestions would be appreciated. Thanks, Mike. | I think I'm going to invest in a extra carb before I do any mods on my only one.
__________________ _________________________________________________ It's a mathematical fact, 10 out of 8 people have trouble with fractions. Kings 70cc 3200+ miles. Now on a Schwinn Point Beach. (And say HI to my Dad, he works there in the Archives!) |
09-13-2008, 08:34 PM
| | Master Motorized Bicycle Builder | | Join Date: Sep 2008 Location: black mountain NC
Posts: 152
| | Re: Stock carb mod
thats what I did I bought a second
take care
JAK | | Thread Tools | | | | Display Modes |  Linear Mode | 
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