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Old 06-14-2010, 02:25 AM   #1
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Default sirio cl7b big problem !

Hi All,


I am new at this forum but I need a bit help. I own a sirio CL7b long stroke enigne. It has about 1.5 galon. It burns plugs all the time, I even add shrims (2x 0.1mm) to make it "looser" but it stil nothing, engine runs great for 10 minuts and cut off ( turn down) ale the plug is broken. It's perfectly set-ed up by a a-main guy here in poland, it keeps 110 C degrees all the time. I tried to use turbo plugs (OS P3, oS P4, Sirio 6, Sirio 7, SIIM 7, SIIM 8, Novarossi 5, Novarossi 6, RB 6) and after that i tried to use normal plugs ( have 2 buttons) - OS no.8, OS A5, OS R5, Novarrosi C5, novarossi C6 and others. INSIDE the enigne i perfectly CLEAN AND look great, it has great compression. The carbureator has been sealed really well, no leaks. I use ofna jp-3 muffer. I use power safe 25% fuel, 12% synthetic oil but i also tried byron 25% race fuel and it was the same story. Has been broken in by head cycle 9 tanks method. Need photos of inside? tell me i will send them here. Please give me some clue?

In addition I can say that for about half galon after breaking in it runed great. The problems start after that.
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Old 06-14-2010, 02:38 AM   #2
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it may be running too rich.
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Old 06-14-2010, 04:53 AM   #3
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nope, it runs good fuel mix. Not too reach not to low.
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Old 06-14-2010, 12:04 PM   #4
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new to nitro yet you are 100% sure the tune is perfect.

okay, assuming you are correct i would try the hottest plug you can find an os p3 would be a good start,

if it is still acting up i would look at the fuel. did the problems begin about the time you cracked open a new bottle of fuel?
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Old 06-14-2010, 12:09 PM   #5
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I would check the rod and crank for play, that can blow plugs.
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Old 06-14-2010, 12:33 PM   #6
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Did it start after you put a regular plug in it? you cant interchange turbo and regular you may need a new head button.
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Old 06-14-2010, 01:25 PM   #7
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Quote:
Originally Posted by RC-ZOMBIE View Post
Did it start after you put a regular plug in it? you cant interchange turbo and regular you may need a new head button.
The CL7B come with both turbo and standard head buttons.
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Old 06-14-2010, 01:55 PM   #8
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Quote:
Originally Posted by smittyusmc View Post
The CL7B come with both turbo and standard head buttons.
Sorry didnt know that sorry
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Old 06-14-2010, 02:19 PM   #9
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Almost every Cl7b I've rebuilt needed a new rear bearing. Look at the piston through the exhaust port and look for very small scratches.

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Old 06-14-2010, 04:03 PM   #10
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Sounds like a bearing problem
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Old 06-15-2010, 02:13 AM   #11
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bearing is gone ;/ incredible one of bearing balls "breake in 2 halfs " i have scrathes on piston and sleeve. Tell me now where I can get a bearing and rebuild set because that one is probably dead (scratches). Can't get it why it happend so fast ;| always get about 3 gallons before bearing change.


Tell me what to do, 1st option - new bearing and try to run it, 2nd- engine to waste paper basket, it doesn't make sens to rebuild it full ( piston, slave, conrod) because i payed (new one) 160$ for it. (50$ conrod, 120$ piston + slave)

photos of it : http : // wyslijto . pl / files / download / 98ypp4ceo1 (DELETE THE SPACES)
to download photos use your left mouse button and clic on " silnik.rar (rozmiar: 2,2 MB ) " !

Last edited by sialek; 06-15-2010 at 02:39 AM.
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Old 06-15-2010, 02:46 PM   #12
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I didn't look at the pics but if they are just small scratches just a repinch and it will run like a champ. If it has a big gouge it's probably toast.

I charge $28.95 for a Tko ceramic bearing and $37.00 for the rebuild, pinch etc. return shipping included. I think there may be a problem with the block machining on those motors causing it or just terrible bearings. I have seen at least 5 engines just like yours, one with chunks of the balls missing.

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