posted
Hi everyone. I just got a new C12 with rotary carb and pullstart for my TMaxx. Just now I idled it through its first tank of fuel (Traxxas 20%). It idled nicely, much better than the original TRX motor ever did. It was a cool night with a slight breaze, but the motor seemed hot, even though I had it so rich it was almost ready to stall, there was plenty of oil spattering out the exhaust too. The problem came when I shut it off. I knew it was gonna be thight, so I immediately tried to get the piston to BDC, but apparently I wasnt fast enough, it stuck at TDC and I had to use pliers on the flywheel to get it to turn. After it cooled, I could finally turn it by hand at BDC, but it is still tight, and anywhere near TDC requires pliers to turn it. The pullstarter wont even budge it no matter where the piston is. I have no idea how I'm going to start this thing since the pullstarter wont move it and there is no way to get at it with a bumpstarter. Any ideas? Is this normal? Did I do something wrong? Also, if I ever do get it started again, where should I run the needle settings? I ran it on this tank with both needles slightly richer than what it was set at from the factory. I havent put any rpm's to it yet at all, just idling. By the way, Im currently running an Ofna 1/10 welded aluminum 3-chamber pipe and a Stinger header turned upside down and bent slightly to use with the Ofna pipe in the stock location with a Motorsaver .15 filter. What do you think of that combo? Is the Traxxas fuel good to use on this engine? I have only run the stock Traxxas engine before. Any help would be really appreciated. Thanks, -Glen.
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bmwz8
unregistered
posted
a problem could be that you began break-in at night were the humidity is higher and cooler than normal. i always do break-in in the early afternoon so its not to humid and not to hot. i know that new engines have tight tolerences. you may want to heat the head slightly with a hair dryer first before starting, this happened to me with my sbk. the tolerences were so tight that the starter which was connected to my car battery couldn't turn it over and i sherreded the starter wheel the first couple times.
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<Glen>
unregistered
posted
Yes, it has been rather humid here the last few days and it is foggy in the mornings. I will try the hair dryer method. Thanks.
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posted
I've had problems when letting the engine idle for the first tank. The fuel left a sticky deposit on the piston/sleeve wich siezed the engine. I hat to put WD40 inside to free things up and afrer that I changed fuel. That happened using Sidewinder Pro Star fuel that is supposed to be all synthetic lube.
I am now using byron 30% with no problems.
Try taking off the combustion chamber to see if you have deposits inside. :cool: :rolleyes: :rolleyes:
posted
Thanks for the ideas on the hairdryer and WD40. I've been soaking it in WD, rotating the crank by hand and with pliers and heating with the hair dryer. It has loosened up just a tiny bit, but not anywhere near loose enough to crank it with the pullstart. I'm wondering if maybe the one-way bearing has frozen??
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posted
If you are not sure about all this and do not want to do any damage to your engine we advice you to bring it back to your LHS and let him take a look at it to see if something is wrong or not.
Posts: 5412 | From: Allevard, FRANCE | Registered: Jul 2002
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Pontano
unregistered
posted
Try this, Remove the plug, take it to your starter and run it for a minute or two. Quickly insert the plug. You shouldn't have any problems starting it now. I have to use this method every time on my new engines.
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posted
You're right Rody, Maybe I should have added that you need to put a few drops of after run oil before going ahead with this proceedure. Do not do it without doing this or you could damage your engine. But the fact is that this procedure do work, and i have yet to damage an engine
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losidirtdevil
unregistered
posted
Yea, I would do what Pontano does. It has worked for me. Just take the glow plug out and put a drop of after run oil in the hole and then try and turn the engine over very briefly!!
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posted
I still prefere you just heat up the engine with a hairdryer before starting, especially when the engine is new. With this method the engine starts more easily and one it runs all turning parts are being lubrified while with your method you only have oil between the piston and liner.
Posts: 5412 | From: Allevard, FRANCE | Registered: Jul 2002
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Pontano
unregistered
posted
OK, I've tried the hairblower on my new engine. Ít works great i will keep this method in mind. Unfortunatly i do not have access to 220 V on the track that i run. So I will probably keep with the method that i used before. My neibours just hate me starting starting a new engine.
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