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ofna force 26 not getting fuel? - 1/15/2013 11:07 PM   
bikeordie092


 

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From: Maryville, TN, USA
Status: offline 		 hello, i just got a buggy that has a new ofna force 26 motor that seems like it isnt getting fuel.. i can pour a couple drops into the intake and the motor will fire for a second or 2 but cuts straight back off.. im not sure what to do. any ideas?

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RE: ofna force 26 not getting fuel? - 1/15/2013 11:41 PM   
Argess



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From: Pleasantville, NS, CANADA
Status: online 		Here's some info that might help:

1/ Prime it by tunring over the engine with your finger covering the exhaust. You'll see the fuel go up the fuel-line until it hits the carb. Crank for 1 second more to make sure fuel is actually in the carb. If fuel isn't moving in the line, make sure your fuel lid is tightly closed and there are no air leaks in the system.

2/ Remove the air filter and make sure at idle there is still a gap. Adjust the idle set screw for approx 1mm of gap when throttle is all the way closed (using the transmitter to apply the brakes to be sure). Re-install the air filter.

3/ Adjust the throttle trim on your transmitter so the throttle opens a small amount. Typically as soon as you see the rubber bellows start to move is about right. Be ready to throttle back if the engine revs too much (bad on a cold engine).

4/ Seems to me, the Force 26 shoud start with the LSN "flush" and the HSN about 1.5 to 2 turns in from flush. The LSN is probably never adjusted more than 1 turn in from flush, and the HSN can be almost anywhere, but typically 2.5 turns in from flush once broken in. The LSN is often about 1/2 turn in from flush once tuned.

Try this and if still no go, see if there are any more clues you can provide so we can help more.

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RE: ofna force 26 not getting fuel? - 1/15/2013 11:49 PM   
bikeordie092


 

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Status: offline 		i have to ask, not to sound dumb but what exactly are you calling "flush"? when it begins to get tight?

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RE: ofna force 26 not getting fuel? - 1/16/2013 12:23 AM   
bikeordie092


 

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Status: offline 		i guess the reason im asking is i dont understand how one would go past "flush" 

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RE: ofna force 26 not getting fuel? - 1/16/2013 12:45 AM   
Argess



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Status: online 		No, flush means the top of the needle (where the screwdriver goes) is level with the tube that surrounds it. You should be able to see what I mean in the pic below, even though it's not a Force carb.



The instructions for the Force 26 can be found in the link below. Note they talk about "X" turns out. They mean "turns out from fully seated". If you do seat the needle (all the way in), be very gentle as it's easy to damage the needle tip. It's probably easier (although perhaps less accurate) to go with the method I previously mentioned for an adjustment. Those turns in from flush were from my old Force 26, and if they're still made the same way, should work for you without issue.

http://www.ofna.com/pdf/eng-force25-26.pdf

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RE: ofna force 26 not getting fuel? - 1/16/2013 5:34 AM   
bikeordie092


 

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Status: offline 		That actually looks almost exactly like my carb but I don't see that that idle stop screw is actually adjusting anything... do u have any clue as to where I should start that one at?

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RE: ofna force 26 not getting fuel? - 1/16/2013 2:49 PM   
Argess



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Status: online 		The Idle Speed Screw is just a STOP for the throttle... so it doesn't idle too low and shut off.

When you remove the airfilter and look down the carb mouth, you should see a small gap between the throttle slide (or barrel in rotary carbs, or butterfly in larger engine carbs). Turn ON your radio gear and operate the throttle. You will see the gap getting bigger until there is almost nothing in the way for air to travel through the carb.

Put the throttle back to the idle setting. A properly adjusted radio (or throttle) linkage will actually have the servo move a bit past idle. There is a spring on the throttle linkage (at the servo end) that acts as an over-ride, so the carb isn't damaged by this (or when you put on the brakes.) The main point here is the servo pushes the throttle closed BUT the Idle Stop Screw keeps it from closing too far.

At idle, you want the gap to be about 1 mm wide at its widest point. A little less is OK, but not more. Some people get the gap down to 0.5 mm, but there LSN is usually adjusted very, very well for such a small gap to give a good idle. Final idle speed can be tweaked with the engine running, but generally the adjustment with the engine not running is sufficient.

To adjust the Idle Stop Screw, open the throttle a bit and screw in the Idle Stop Screw. Now put the throttle back to idle. The gap should be larger. The reason to do this with the throttle open a bit, is to take pressure off the Idle Stop Screw as it can bind otherwise. Unscrewing the Idle Stop Screw to make the gap smaller usually doesn't require you take the pressure off. Whatever happens, do not force anything.

The final position of the throttle at idle (the gap) is great for a warmed up engine, but as I mentioned in my first post, starting a cold engine is easier if you open the throttle a tiny bit using the throttle trim on the transmitter. Move it just enough you start to see movement of the rubber bellows. No more, or it may speed up too much when it starts, and that's bad for a cold engine.

There is a lot of video tutorials on You Tube that cover tuning very well. There are even videos specifically for adjusting the idle gap. Try a YouTube Search on RC idle Gap.

Not sure I like this one that much because he's talking about adjusting when the engine is running, and not an intial setting for getting started. Anyway, start watching at 1:50 for idle gap adjustments and you can see how it works:





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RE: ofna force 26 not getting fuel? - 1/16/2013 10:31 PM   
bikeordie092


 

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Status: offline 		ok, so i got it to start, but its almost like when the motor warms up it goes wide open! so of course i cut it off, but sometimes itll idle ok if i adjust on it enough.. but eventually, if i dont hold the throttle closed it will rev wayyy up... im stuck?

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RE: ofna force 26 not getting fuel? - 1/16/2013 10:36 PM   
bikeordie092


 

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Status: offline 		the guy at the hobby store recommended that i take the gas tank of and empty it and use new fuel as i dont know how long that fuel has been in it.. im about to do that and then see what happens

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RE: ofna force 26 not getting fuel? - 1/16/2013 11:08 PM   
Argess



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Status: online 		It's probably adjustments. Fuel is hardly ever an issue unless you leave the bottle uncapped in humid air for a long time..

With engine off, remove air filter, operate throttle back and forth and watch what happens. You need to look for consistency with the throttle returning to idle the same way every time.

It may be reving up once it warms a bit because 1/ you have an air leak, 2/ your LSN is adjusted to lean, or 3/ idle air gap is too large.

or other things..........

Do a lot of visual inspection to make sure all fuel and pressure lines are intact, exhaust is not loose, fuel cap is tight, glowplug is tight, radio operates throttle correctly, etc.

Now for good news. As you can now get it to start, don't be afraid to make small tuning changes (little bit at a time) to see how the engine responds.

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RE: ofna force 26 not getting fuel? - 1/17/2013 12:29 AM   
nitroexpress



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quote:

ORIGINAL: bikeordie092

ok, so i got it to start, but its almost like when the motor warms up it goes wide open! so of course i cut it off, but sometimes itll idle ok if i adjust on it enough.. but eventually, if i dont hold the throttle closed it will rev wayyy up... im stuck?

In the middle of the video that was posted, you'll notice a spring on the carb.  This spring acts as a throttle return.  Do you have a similar setup on your vehicle?  You shouldn't have to hold your throttle closed, it should always be able to go to idle down on it's own. 

Once you set the idle gap it should stay the same every time you let off on the throttle on the transmitter.

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RE: ofna force 26 not getting fuel? - 1/17/2013 12:32 AM   
bikeordie092


 

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From: Maryville, TN, USA
Status: offline 		lol well... i finally got it to idle. good lord it took ALOT of adjusting!!

now for the bad news.. i believe it may have the wrong glow plug in it... the glow plug itself says 8 on it... the actual ofna glow plug should say b4 if i am correct.. idk what this glow plug is or what its from... oh yeah and evidently it has a pipe from a 1/10 on it... i ordered a bunch of stuff for it from ofna warehouse since nobody around here keeps ofna stuff in stock.

i ordered a set of center dogbones for it along with a joint cap since it doesnt have a front one and with the "open differential" as the guy at the hobby store called it, it will go nowhere without the front driveshaft.

i also ordred the correct glow plug and the correct pipe for it (ordered the pipe off ebay since i found a NEW one for under $10), and i ordred a body for it since the guy before me killed the one that was on it (that im pretty sure wasnt meant for it to begin with) by cutting it with what looks like a can opener and putting tiny holes all thru it lol

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RE: ofna force 26 not getting fuel? - 1/17/2013 12:33 AM   
bikeordie092


 

Posts: 35
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From: Maryville, TN, USA
Status: offline 		yes, it does have that spring. i had to adjust on it too lol but its there.


oh yeah! on a different note the motor does sometimes rev up real quick and right back down to idle... too rich?? idk... seems like i can only make it better and not get rid of it....

< Message edited by bikeordie092 -- 1/17/2013 1:27 AM >

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