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Author Topic: RC51 woes  (Read 2330 times)

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Fast4fun

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RC51 woes
« on: April 09, 2003, 11:48:33 pm »
I replaced my exhaust with a Jardine 2-1 and pcIIIr. The bike seemed to run well for the day I took it out of storage before the changes. After... it backfires and dies regularly. I took it in for a custom map just to find out that the front cylinder is low on compression. The mechanic believes it is probably a valve that needs adjustment. No surprise, I am over the suggested mileage limit for a full tune-up. I raced regularly last season without any problems. Just trying to make mild improvements for this season. Does anyone have enough experience with the RC to diagnose!? the problem. I am quickly getting into a financial windfall. If it is just a valve adjustment then I'm OK. If it's more...? I guess no one said racing would be cheap. But it sure is fun!
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tzracer

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Re: RC51 woes
« Reply #1 on: April 10, 2003, 07:49:36 am »
Do a leak test to see if/where the cylinder is leaking (do this after checking/adjusting valves). I have not had any problems with my RC, but I only have about 2000 miles on it.
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tcchin

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Re: RC51 woes
« Reply #2 on: April 10, 2003, 03:03:31 pm »
Adjust the valves and do a leak-down test. Also, make sure the PC3r is properly grounded. For grins, remove the PC from the system and see if your stalling/backfiring is affected.
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unforgivenracing

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Re: RC51 woes
« Reply #3 on: May 12, 2003, 03:35:22 pm »
You said it your self that its do for a full service.  DO it.  while your getting the valves serviced, have them do a leak-down on the head when their done.  I dought its major.
Did you check to make sure the header bolts are still tight?
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timsotherrc51

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Re: RC51 woes
« Reply #4 on: May 25, 2003, 08:02:34 pm »
Had the valves checked... they're ok. Still not holding pressure in the front cylinder. Must consider whether or not to invest the dime to rebuild. Suggestions are welcome.
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wilbur

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Re: RC51 woes
« Reply #5 on: May 29, 2003, 01:38:36 pm »
Give it to me for free.

Seriously it can only be piston rings or valves. Pull the head and you'll know for sure.  But before you do that, a quick way to check rings is to squirt some oil in the spark plug hole and do a compression check.  If compression is up after squirting oil in the cylinder than it is a ring problem.  If compression dosen't change it is a valve problem.
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Fast4fun

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Re: RC51 woes
« Reply #6 on: May 29, 2003, 09:56:36 pm »
Pulled the engine. There is some scoring of the cylinder. Having it bored 1/4 over with genuine honda pistons and new rings. Since I have it in pieces, I am looking for engine modification suggestions (Cams, porting, etc). See related thread. I will post the results. Even with the loss in compression It was pulling 117 hp on one dyno.
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CCS Mid West EX #675
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