Fate of My Race Concepts Performance Parts
Yes you read it right!The odo now stands now at 51800Km that's nearly 16K kms on the Race Concepts power parts.Off late I was fed up with the irritating cam noise which was prominent with the Db killer plonked in and there was smoke on cold starts.So we took the bike to my mech outside the ASC who suggested to get the valve oil seals checked.Bought the necessary spare from Yamaha Spare dealer and went ahead dismantling the head.We also were ready to switch back to stock OEM
camshaft which was removed and safely stored in my home.My mech first drained the oil and there like 250ml less Mind this was when the oil was drained and replaced 900kms back
and the colour was dark black and had smell of gasoline and the mech suspected a leaking rings. We went ahead with the dismantling the head and thought we would check the condition of the bore.Up on inspecting the bore there were prominent vertical lines which shouldn't me there in any case.I asked my mech to take out the Race Concepts Cylinder kit and what i saw next literally gave me an heart attack
Attaching images of the so called Semi Forged Piston
The kind of wear on a Semi forged piston that merely run 16K kms is not acceptable at all and as a reminder the bike was extensively run in for first 2000Kms with 4 oil and oil filter changes in between.I have always used Motul 5100 15W50 oil after the build.
I bought new OEM
STD size Cylinder kit and replaced the RC Camshaft with stock OEM
camshaft .The bike is again being run in again.I have removed the Race Concepts Exhaust system for breaking in the rebuilt engine.Once done with rebuilt the moment we started the engine the bike sounded so refined and there was no cam noise unlike the RC Build.
Points to note
* The Piston was Supposed to be Semi Forged which I Highly doubt now.
* Race Concepts indicate a 500 km run in where as i have done extensive 2000 Kms run-in
* The bike did have 26mm carb upjetted to 117.5 and 15 pilot jet and later upgraded to 29mm carb with the same jet kit and had a good fueling which one could find from the head deposits reading a few pages back
*The build was done on Yamaha ASC under my supervision
* The RC cam make annoying noises and reverse cranks which was claimed to be reduced after clocking some km and till 16k kms i haven't seen the cam noise reducing Final Verdict
Does this kit increase power as advertised ?
Yes indeed the moment you switch between and RC build and stock bike you could feel the difference
Does the kit lasts like OEM
as advertised ?
From my personal experience the answer is NO since mine failed barley under 16K kms and if one make a bit a google search you could find out the large number of similar failures stories
Didn't I get to know about the horror stories about RC builds before my build ?
Yes I did know the stories and lot of biking friends have advised me against the RC build but I was kind of ready for it
Did I had some major engine damage?
As indicated we were able to examine and remove the kit at early failure stage so major damages to the bottom end was avoided Do I recommend these kits?
I definitely NOT!
So You might think that this thread is done? No Its just one finished chapter.The kind of knowledge i acquired and hand on experience i have gone through on this particular build has opened doors for in depth knowledge on engines.Now i do find time now and setup carb for close friends who have issues with it. I'm thankful for all people who have shared their knowledge with me. Next - DIY Hazard Lights