Backfired through the crankcase - Speedzilla Motorcycle Message Forums
 
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post #1 of 15 (permalink) Old 05-26-2014, 04:06 PM Thread Starter
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Backfired through the crankcase

Hi guys,
This could be a good one for you rc51 nuts.Took my sp2 out for a ride parked up for an hour turned on the ignition pressed the starter almighty back fire through the crankcase and split the front cam cover in half and blew out the rear cover gasket. Any ideas
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post #2 of 15 (permalink) Old 05-26-2014, 05:35 PM
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That sounds really abnormal. Did someone plug up your exhaust can tips with potatoes or something?


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post #3 of 15 (permalink) Old 05-26-2014, 06:10 PM Thread Starter
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No sir had similar issues last year but only used to blow the cam cover gaskets out. Ran injector cleaner through and it was fine after that. Third run this year it did this. Have a new fuel pressure regulater on as I heard these had issues.
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post #4 of 15 (permalink) Old 05-26-2014, 08:55 PM
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Ignition timing?
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post #5 of 15 (permalink) Old 05-28-2014, 09:02 PM
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i went through this issue a few years ago... to make it short... believe it or not it was the Alternator. At least in my case.

Jose
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post #6 of 15 (permalink) Old 05-28-2014, 09:06 PM
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i mean the Stator / Alternator... sorry not my nativ Language.

I hope you get what i mean.

Jose
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post #7 of 15 (permalink) Old 05-29-2014, 12:44 AM
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motero.. can you explain more. Very interesting.

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post #8 of 15 (permalink) Old 05-29-2014, 02:00 AM
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Litteraly blew your valve cover into 2 pieces? Never heard anything like that

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post #9 of 15 (permalink) Old 05-29-2014, 08:26 AM
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i will try to explain it a bit better how it was in my case. It backfired like 4-5 times to me but it was unpredictable, so if fixed the rear casket cover everytime ... went for a test ride and was getting all nervous to press the Start button. Either she startet fine or bang the deflagration happened it was like a lottery...
then on one of the Test rides the bike didn't want to start even the batterie was full charged and i thought great another problem... after checking all the responsible Electronic parts, i have found out that the Stator had a tiny faulty Spot and made a short circuit, good i thought at least i could fix that problem... but it also fixed my backfiring problem!!!

It never happened again after changing the Stator.

About the valve cover splitting in 2 pieces, that didn't happened to me but i think it is because the pressure of the deflaration searches the weakest point (gasket cover)... and when you fix the gasket cover maybe to tide with a lot of seal then the pressure can destroy more i.e. the valve cover ...


Hope that helps a bit more...

Jose
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post #10 of 15 (permalink) Old 05-29-2014, 08:39 PM
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I had the exact same thing happen a couple nights ago after too many Taco's and Tequila shots.


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post #11 of 15 (permalink) Old 05-29-2014, 09:18 PM
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Quote:
Originally Posted by LDH View Post
I had the exact same thing happen a couple nights ago after too many Taco's and Tequila shots.
+1!


On a serious note though, there is not a reason in hell the stator should cause a backfire inside the crank case.

A damaged pair system, piston rings, or valve stem seal could cause the system to over pressurize, but if your crank case breather is opperating properly blowing seals and braking valve covers wont happen, my starting point would be figuring out why the crank case isn't venting and work from there.
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post #12 of 15 (permalink) Old 05-30-2014, 04:19 AM
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Quote:
Originally Posted by LDH View Post
I had the exact same thing happen a couple nights ago after too many Taco's and Tequila shots.


+2. I hate when that happens.
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post #13 of 15 (permalink) Old 05-31-2014, 05:36 AM
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Sounds like a bad fuel injector! Smell the oil and see if it smells like fuel and if it is real thin. The fuel injector cleaner might have temporarily fixed the issue last time.
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post #14 of 15 (permalink) Old 05-31-2014, 03:47 PM
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Arrow Miles? Did YOU check Valve Adjustment? Cam(s) Timing

Quote:
Originally Posted by LDH View Post
I had the exact same thing happen a couple nights ago after too many Taco's and Tequila shots.

LMAO
Yeah Mike, but I bet Your "Back Firing Problem" wasn't through the Valve cover, Yours I willing to bet is like most other Back Fires,>>>>>....















OUT Your Tail PIPE!







My question to the OP/Mark is How many miles do You have on Her?

Have the CAM\Valve specs. been checked recently
IF So, did the Valves need adjusting.... YES Okay, You SHOULD check you Cam Timing...


Sounds like to me YOU have changed something recently and this is when the problem(s) started Yes/No?

Peace Jeff
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post #15 of 15 (permalink) Old 06-01-2014, 06:58 PM Thread Starter
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Thanks for all the replies guys. The bike has done 30,000 miles cam timing is spot on all clearances spot on. Had injectors cleaned and flow tested all ok. Just put on a new FPR started up today all seems ok just need to get her out on the road..
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