Goped/RC High Performance Carb Tuning Demonstration

My attempt at showing you how to tune a high performance carb.
Edit 7/6/08:
Someone pointed out an error that I made regarding the rich and lean terms. In the video I say when you adjust the jets you're affecting the air/fuel mixture. You're actually only controlling the AMOUNT OF FUEL being MIXED with the air going into the engine. You are NOT controlling the amount of air AND fuel.
Edit 7/21/09:
Another error in this video has been brought to my attention. Beginning at 3:23, I mention that you should richen the needle out 1/16 of a turn. It should be turned counter-clockwise but in the video I turn it clockwise. Not sure why I did that.

[@SiLeNtShAdOw7777]

Glad you like it thanks and congrats on your x-ped! The alternative to a pull start is to pretty much just bump start it and pick it up. Besides having a clutch, this is why I haven't gotten an air scoop or block off. It's makes it easier to start it when you want to work on it.

[@pimpnride]

my goped has been sitting in my gargae untuned for like 3 months..i have a light blue all custom super Xped....but never knew how to tune it..thanks too you goped runs great. and i know how to tune hahah thanks alot..great video

[@skylerviper14]

Best video on gopedding I have ever seen

[@SiLeNtShAdOw7777]

@pimpnride No prob glad to help! And good to hear that your ped is running great now!

[@davison1021]

thanks man a few years back when modifiing scooters this would have helped me alot took me 3 weeks but i got it had a bws with a 72cc top performance engin witha teknigas rs for and rear clutches changed to malossi and a top speed gear system and i hit 120 kmph and fast after i set the carb

[@codysnook9688]

thank for the video adjusted card started right up and fix the idle started on cold start thnks

[@SiLeNtShAdOw7777]

Yes, the hole is already there it just needs to be widened with a drill so you can fit the swivel into it. I think it's the third hole up from the bottom on the throttle plate but you might want to double check first as I can't accurately recall.

[@MsAnthony54321]

Thanks so much it helped alot !

[@SiLeNtShAdOw7777]

@mikeydog1743 It is advised to richen the high jet 1/16 of a turn as a precaution to ensure that there is enough gas/oil to cool the engine at higher RPMs. No need to do it to the low jet since it's mostly works within the idle/lower RPM range.

[@SiLeNtShAdOw7777]

No prob. I'd still stay with the .710. You'll be running a setup similar to mine, and right now I'm happy with the good balance of acceleration and top speed.

[@SiLeNtShAdOw7777]

Double check to make sure you're getting a spark by removing the spark plug and reconnecting it to the ignition. Then hold it close to the cylinder and pull the pull starter. You should be able to see a very small spark. If there's no spark then your spark plug might be gone or needs to be regapped or the ignition might need to be regapped or replaced. If you are getting a spark then check for an air leak and recheck your tuning settings.

[@SiLeNtShAdOw7777]

@BMXPimp13 You mean what does tuning do? It allows you to get the absolute best performance you possibly can from your engine. Proper tuning also makes sure that the engine runs smoothly and reliably.

[@SiLeNtShAdOw7777]

@gtdrummerdude Thanks for the correction, but I had already noted the error in the video description a while back.

[@SiLeNtShAdOw7777]

Works well on this engine. Small, but hardly noticeable bog (normal for this carb) off the line but other than that no complaints.

[@SiLeNtShAdOw7777]

The only plugs I've had experience with on these engines are the NGK plugs. They're the plugs that come stock. I've heard good things about Bosch and Champion plugs too. But I can definitely tell you the NGKs work well.

[@SiLeNtShAdOw7777]

@flawlessbeastizzle You need to get a synthetic oil (such as Klotz) and mix it with at least 91 or higher octane gas at the appropriate ratio for your engine. If you have an G23LH engine, then the ratio would be 40:1. If you have a "Geo" engine (GZ25N14/23), the ratio is 50:1. If you have an RC engine, then the ratio is 25:1. You can get a measuring cup to help you measure the correct amount of oil. Just mix the gas and oil in a appropriate container and you're good to go.

[@SiLeNtShAdOw7777]

As for upgrades start with a different spindle and HP carburetor if you already don't have one. Then, when you crave more power add a pipe later.

[@SiLeNtShAdOw7777]

@55ip Usually they don't but that may vary by who you got your engine from. You should be able to find new bolts at your local hardware store. Size M5 x 14.

[@SiLeNtShAdOw7777]

@uisbitchface If you mean the GPL290, in it's stock form no. You can add a HP carb if you don't have one already and then that will allow you to tune it.

[@SiLeNtShAdOw7777]

Yes that's actually the recommended oil/fuel ratio for RC engines so that's certainly fine.

[@SiLeNtShAdOw7777]

Double check your settings and fuel mixture. It's also possible that you have an air leak somewhere.

[@SiLeNtShAdOw7777]

-Make sure you mix the proper fuel oil ratio for your engine. -Adjust the spindle before each ride to make sure it doesn't slip and to maximize tire life. - Check the spark plug every few tanks of gas to make sure it's gapped correctly and is clean. Same with the air filter. If you have an RC engine or any other aftermarket performance parts: -Tune the carb before each ride. -Don't WOT for more than 5 seconds.

[@mastax1234]

@jerseyrotaries it does

[@SiLeNtShAdOw7777]

Yes.

[@SiLeNtShAdOw7777]

Or almost any other aftermarket part that will fit the engine will allow you to boost performance too.

[@SiLeNtShAdOw7777]

Well, the larger the spindle the faster you'll go at the expense of acceleration and the smaller the spindle the slower you'll go but with better acceleration. If you prefer speed go with a bigger spindle. If you want acceleration go with a smaller one. IMO, on a stock G230 I'd get a .710. That's a good all-around size. Anything .750 and above will lead to sluggish acceleration (unless you're really light).

[@Carguylogan]

@SiLeNtShAdOw7777 I've run one tank of gas through it (about 15 miles) and heat cycled it- ran it and let it cool off completely- 7 times now. Do you think that's good enough or should I break it in more? Carb was too lean when it seized, now I have the high speed screw at 1-3/8 turns out where it runs best.

[@SiLeNtShAdOw7777]

@pikeybear What kind of ped do you have? Sounds like a Bigfoot or Geo Sport? If so, the engine will stall when you engage the clutch at a dead stop. You need to get the ped going by kicking for a bit then engage the clutch.

[@SiLeNtShAdOw7777]

No. The low jet is for the lower power range and the high jet is for the higher power range. You adjust (richen or lean) both jets to get the best performance.

[@Carguylogan]

@SiLeNtShAdOw7777 Ah, I missed it. Hey I could use your opinion about something. I just put a new piston in my G260 hybrid (G23 case and crank with G260 top end) because the old one got messed up when a crank bearing came apart. I drove it for like 3 minutes before trying to max it out (stupid) and it seized. I freed the ring and restarted it, has the samne power and runs great, now trying to brea kit in properly before hitting full throttle again.

[@SiLeNtShAdOw7777]

If you're still having trouble with your engine there might be another problem. Check your gas/oil mixture, spark plug, check for air leaks, the usual diagnostics.

[@pikeybear]

can you do a vid on tuning the idle im having problems every time i start it i put the clutch down and it just stalls

[@AskLeRoy]

i have a gz25n14 motor and want a hp carb, this whole project is going into a rc boat. will the kit [S31104] from gomeyer bolt to my engine ? thankyou !

[@Branhawk]

is the fuel in line the one by the bubble?

[@BurnRiderZ99]

Hey, i need help? well when ever i turn my engine on it runs fine and dandy and idk but il pull the throttle a little and it will keep going and once its really warmed up i wont even touch the exceleration and it will FLY like full speed and its a huge problem i dont know what to do ive bin trying to tune it for the past 2 hours by the way the engine is new

[@yumaokamoto]

my engine idles way too high. Which screw do I adjust, b/c I only see one.

[@EazyDoesIt491]

you say richen it out at the highest rpm 1/16 of a turn. but you turn the screw to the right

[@pikeybear]

ive followed all the steps but it struggles to reach top rpms help please

[@AMHMAN22]

when i rev the engine to tune it, it boggs out, what should i do

[@AMHMAN22]

same here

[@mihith]

i need help my goped haigh and low jet and i am just a kid and my goped wont start plz help

[@CAPTQYOUELL]

My goped different no one has one like mine I need help with it bad

[@mihith]

my goped dosent have a high and low jet so i need help. and i am just a kid.my goped wouldnt start i need help plz.

[@SiLeNtShAdOw7777]

Hopefully you mean 25:1.

[@Carguylogan]

Some of your notes are incorrect and will be confusing to newcomers. To richen the engine is NOT to allow more fuel/air into the engine, it is to allow more fuel only into the engine. The amount of air entering the engine is adjustable only by the throttle lever. More fuel for a given amount of air is richer, less fuel for the same given amount of air is leaner.

[@AMHMAN22]

when i even try to rev it it boggs out

[@SiLeNtShAdOw7777]

Zenoah G260RC

[@SiLeNtShAdOw7777]

Yea it's an S1.

[@SiLeNtShAdOw7777]

I don't know the exact speed but probably 27-28 mph.

[@SiLeNtShAdOw7777]

yup RC engines are basically that.

[@SiLeNtShAdOw7777]

Nope just tune it and you're ready to go. And tune it before each future ride to make sure you get the best performance from your set up.

[@ZACKSKATER726317]

@carguy12345678910 hey the carb you got is that a good carb

[@SiLeNtShAdOw7777]

Not really. Once properly tuned the engine should perform as best as it can under the conditions in which it operates. So in other words a 5'1", 130 pound rider will travel faster than a 6'1", 240 pound rider on the same engine with the same carb settings. Road, wind conditions, and other variables will effect power as well.

[@MassacreSound]

all that thing is is a dam weed wacker engine with a shiny pipe on it.

[@SiLeNtShAdOw7777]

@carguy12345678910 yup.

[@SiLeNtShAdOw7777]

You'd want to tune the high jet as well to get the most out of the higher RPMs. I mentioned that you really shouldn't have to touch the idle screw. If tuning the carb doesn't do it then there could also be other problems with your engine such as an air leak.

[@sheik480]

You're probably running it too rich. An engine can't burn all the fuel in the cylinder at high speed if it's too rich.