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Old 05-27-2007, 06:15 PM   #1
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Default Nitro Problem, need help

Hey guys.

I went to fire up my CEN Matrix with its OS VG .21 engine today and it appeared to start ok, no issues, and i was planning on tuning it more for performance as I was getting alittle poor low end response. figure needed to lean that out slightly.

Power and response seemed to be fine, but about 3 quarters of a tank in (still had fuel) it died. Checked the glow plug, fine there. Engine seemed to want to fire if I pinched the fuel line, so I figure I was too rich somewhere, but after awhile, just wouldn't fire more than 1 second. Also, the whole drivetrain would spin. I took apart the clutch and all and still had the same issue.

No bubbles in the fuel line, so no air leaks it appears.

Any advice on what to look for is appreciated.

Also, to confirm, the metering needle as described by OS, that is the Low end needle correct?
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Old 05-27-2007, 06:24 PM   #2
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easy one, its one of the clutch bearings....
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Old 05-27-2007, 06:57 PM   #3
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set the motor to stock.. and yes it has a low speed needle and a hight speed needle .. then try to start it up again..
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Old 05-27-2007, 07:15 PM   #4
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Did ya try filling the tank all the way up again? If you've got some time on the buggy the tank or the lines could be sucking air. No bubbles in the line doesn't necessarily mean no air leaks. If the tank seal or pickup go bad it'll just quit sucking before the tank is empty.
Also after trying to start a car for a longer period of time, don't forget to recharge the glow igniter.
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Old 05-27-2007, 07:26 PM   #5
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let us know if anything work's....
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Old 05-27-2007, 07:58 PM   #6
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if you read closer cain said the entire drive line is turning when he tries to start the buggy, now if he took apart the clutch and it not a stuck shoe or a broken spring, its got to be a bad clutch bearing (just had this happen to me) making the drive line turn....
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Old 05-28-2007, 08:29 AM   #7
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Thanks guys. I am going to give all of these a try today.

Looking at the bearings, spinning them up, didn't see a binding issue. However, I did notice that the bearing was a real pain to pull out from the motor shaft. I think some threadlock got on it and bound things up. I am going to try new bearings to see if that is the case.

On there own however, the bearings spin fine.

I will be checking the fuel lines and tank for leaks as well.

What are you guys using for seleant. I was just going to JB weld the tank if there is a leak.
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Old 05-28-2007, 09:06 AM   #8
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Also check that the flywheel nut hasnt come loose. If it does it puts pressure on the bearing and causes it to feel like a blown bearing.

I like to change the clutch bearings every 45-1hour of run time no matter what. Its only 2 bucks if you buy A-Main, Panther, or Avid bearings. And its extra insurance the bearings are always good.

Other things to check are the clutch springs, they may have gotten weak and are letting the clutch engage at low RPMS, this can put enough drag on the motor to stall it at idle.
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Old 05-28-2007, 09:09 AM   #9
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And change the glow plug, just becuase it seems fine doesnt mean it is. I have had them glow on ignitor but had a broken coil up inside.
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Old 05-28-2007, 03:00 PM   #10
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I noticed the following as well:

1. Flywheel had backed out a bit. I am going to try another flywheel / collet combo, will unfortunately have to raise the engine up a tad but it should grab better when cranked down. Strange as the collet is the one that comes with the flywheel.

2. Some of the clutch springs were bent to broken. How often does this happen. I put in a new set and they seemed to have the same issue too right away. 1.0mm and 1.1mm's.
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Old 05-28-2007, 04:40 PM   #11
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this might be a stupid question, but do you have the clutch shoes going the right way??? they could be on backwards...
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Old 05-28-2007, 07:43 PM   #12
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shoes are the right way LOL. I don't think you could get the spring to stay the other way.
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Old 05-28-2007, 07:51 PM   #13
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Quote:
Originally Posted by Cain
I noticed the following as well:


2. Some of the clutch springs were bent to broken. How often does this happen. I put in a new set and they seemed to have the same issue too right away. 1.0mm and 1.1mm's.
That's the whole problem. As far as tuning, it sounds to me that you were on the lean side with your low setting. As a rule, if the engine is crisp and fast right when you start it, it's too lean. If the top end is good try richening the low needle. You can't hurt the engine with this if all else fails.
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Old 05-28-2007, 09:56 PM   #14
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Quote:
Originally Posted by Cain
shoes are the right way LOL. I don't think you could get the spring to stay the other way.
i meant pointed in the wrong direction....
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