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Old 07-06-2008, 06:40 PM   #1
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Default OS 21 trouble (frustrated)

I have always been told about how reliable and easy it is to tune an OS engine.
I have 2 OS 21's an OS 21 tm and an OS 21 VG.
the TM has been very difficult to tune it runs hot all the time and sometimes very hot (300) if you get the temp down then the performance is very poor and has trouble idling.
The VG has a constant problem of flaming out. when you start it , it runs great good performance but, as soon as it temps up (210) it starts to not idle. very hard to get peolpe to work the pits for you when your vehicle is flaming out on ya.
I am very frustrated with these engines. i have an 18 tm which is very good is it the 21's or is it just me. i have had some very experienced people try to tune these engines.
i have pulled te carbs and put high temp silicone at any place i thought there may be a leak but still no cure.
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Old 07-06-2008, 06:44 PM   #2
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First of all, try some different fuel. Fuel problems can cause all the symptons you described.

Second, while 300 is a bit hotter then I would like to see, if it runs good there let it run. Some motors run hot, others don't.

The one that flames out when hot might be too lean on the bottom end. Richen the low end screw and try again.

Try another plug.

Other then that it is hard to tune by text. I would need to see and hear it to know for sure.
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Old 07-06-2008, 07:20 PM   #3
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Hey wingracer thanks for answering i am using werks 20% fuel.
the 21tm performs well but idle is irratic.
it uses a #8 plug
the VG has a #59 plug this motor is the most frustrating as it seem to change from lap to lap. i have richened up the bottom end almost 4 hours already as i mentioned when it is on load it performs good but as soon as it idles it wants to flame out.
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Old 07-06-2008, 07:57 PM   #4
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Raise the idle up some maybe on the VG. It also doesn't take overheating very well with a nickel sleeve, so keep that in mind. What is you compression like when the engine is hot? If it turns over easy, it may need a pinch.

I would suggest moving to a V-Spec if you get another OS engine IMO.
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Old 07-06-2008, 08:16 PM   #5
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I have raised the idle high enough that the clutch engages on the VG.
this engin doesnt run hot i had it out today and it was 85 F ambient temp and the engine was running at 204 F. not hot by any means.
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Old 07-06-2008, 08:42 PM   #6
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At 204F off the track, it may be a bit rich. Try leaning it a bit up to 220-235F
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Old 07-07-2008, 06:06 AM   #7
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I had a VG with the A8 plug on Odonalls 30% with a JP3, I NEVER had one flame out, well other than running out of fuel. But, I can't blame that on the engine. I would get comments about the fact of never flaming out. I will tell you though, at the end of the motors life it was very difficult to start. It's an incredibly realiable engine, I now run the V-spec with the same results. Now I do run on the rich side, about 1/2 hour rich. Some people run their engines at peak tune, but I'll gain 3 to 4 positions just from not flaming out.
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Old 07-07-2008, 10:50 AM   #8
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i would suggest going to factory settings and trying a new plug.. see what that will do for you
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Old 07-08-2008, 06:10 AM   #9
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i replaced the plug on the VG with an Odonnell 100 and added an extra washer. it once again ran very well under load lots of power and top end using factory settings. however would only idle for about 10 seconds. i did make it idle but so rich had no performance. temp on the track at about 240 F. the flame out stuff only happens after it cones up to temp. also have to feather the throttle to start.
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Old 07-08-2008, 07:09 AM   #10
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If you richen the LSN too much, it will not idle, it will stall. You have to lean it an hour or two each time when adjusting the idle and low speed mixture. At the same time, you may need to close the idle screw, as when you lean it, the idle may start to raise. This is when your getting close to proper tuning.
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Old 07-08-2008, 01:16 PM   #11
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Quote:
Originally Posted by Storm59 View Post
Hey wingracer thanks for answering i am using werks 20% fuel.
the 21tm performs well but idle is irratic.
it uses a #8 plug
the VG has a #59 plug this motor is the most frustrating as it seem to change from lap to lap. i have richened up the bottom end almost 4 hours already as i mentioned when it is on load it performs good but as soon as it idles it wants to flame out.

Swap the plugs around. Run the OS LC3 or the MC59 in the 21TM. This motor needs a long hot plug.

Run the #8 in the 21VG as it needs a med hot mid length plug.

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Old 07-08-2008, 01:24 PM   #12
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Darn, I just ordered the .21 VG today, heard it was a great motor for begginers, I am just looking for a reliable motor that does not have to much power as my 12 year old son would not be able to handle it. I was told this was a good choice, but maybe not! Any other suggestions or comments as my LHS just ordered it for me today!
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Old 07-08-2008, 01:33 PM   #13
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Quote:
Originally Posted by Storm59 View Post
i replaced the plug on the VG with an Odonnell 100 and added an extra washer. it once again ran very well under load lots of power and top end using factory settings. however would only idle for about 10 seconds. i did make it idle but so rich had no performance. temp on the track at about 240 F. the flame out stuff only happens after it cones up to temp. also have to feather the throttle to start.
Only idle 10 seconds? Sounds to me like it is pretty close to properly tuned. They should start to load up after 7-8 seconds with a proper tune.
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Old 07-08-2008, 01:40 PM   #14
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Once the .21VG (VD) hits 2 gals you might as well throw it in the trash. Mine and the 5 or 6 others that guys had at our track all wouldn't keep a tune once they hit right around the 2 gallon mark. If you're looking for a motor for your son take a look at the Novarossi 3 port. I picked one up for my girlfriend for her buggy. It's a little more expensive than the OS, but will last waaaaaaaaay longer.
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Old 07-08-2008, 02:02 PM   #15
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Loading up after 10 seconds is one thing, but shutting off is another. I'm pretty sure the VG works great when tuned properly, but I didn't have any luck with the one I had. I've seen one running at my local track and it worked fine. If I had the option to but a lower priced motor, I would try a Novarossi N21B 3 port or a RB S3 IMO.
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