185 on a stock 4 speed with UNI is gonna be rich.

Put the UNI inside the airbox, you won't even be able to hear it. If you can't figure out how to do that, come over to my place along with pradeep some day.

Post some pix mate

RX 135 Spark Plug

Why do you say Mico instead of NGK for RX 135? I had some problem related to engine not starting or the spark plug faulting everytime I drive out for a day. The Spark Plug becomes think carbon. After changing them/cleaning them... could not take it any more. Then visited Yamaha Service and they suggested that to use NGK instead Mico as it won't last.

When I was running issues for some time... in between had changed once to Mico and found to be good. After the service now I have NGK stock one.

I'm currently going through agony

Its RX 135 - 1998 - 4 speed:

Changed to new bore/piston : The engine sounded like new after that.. I felt very happy.

It was going on fine... until I noticed that there was a considerable drop in mileage..

So went to Yamaha service guy.. he said would like into and asked me to come later so that he can devote spl attention..

In meanwhile, I was using my bike normally, suddenly one day while driving it stopped. Check fuel and it was there. Not sure what went wrong, took it to nearby mechanic and he said that there is a dense carbon deposit with oil on the spark plug blew up.

Then he changed to Mico as a standby I thought have no choice as it was getting late in the evening.

The engine roared back to life. Went home.

After few days again faced the same issue. Another mechanic in that particular area said due to excess oil flow the spark plug faulted. Again changed it.

Then went to Yamaha Service, he then checked and said we need to change the ignition coil, CDI and Spark Plug, oil seal etc. Spent 1.5K.

The bike started to behave properly and thought to my self finally misery ended.

Today, misery surfaced but this time the engine did not die, however, it kinda blocking when throttled. The area where I driving spotted the mechanic and aked him to clean the spark plug. He did, then took a test ride, he came back stating that we need to check CDI and starting coil.. I said boss Ignition coil and CDI has been replaced newly.

He said might be the starting coil or need to check the wiring for any earthing issue.

Then thought to myself, this is endless, I have been having this bike for 11 years and last few weeks battling almost every day. I was trying to think back as what on earth. I have invested so much that could not think of any reliable mechanics to leave my bike.

It is really depressing that I could drive anymore, went home parked the bike.

I would like experts to share thoughts on the issue faced and also suggest if W5BC can be used for my bike as against the yamaha Service's advise.

Help! Help!!

^^^ Because NGK India does not import non resistor spark plugs. If your bike's recommended plug is non resistor type, then stick to that. Which spark plug is recommended in your manual? Won't comment further until you tell me that...

Have you ruled out badly adjusted oil pump and carb?

Resistor or non resistor type plug cap doesn't matter raccoon.

Are you running the oil pump sriram?

I know some people say it dosen't matter, but that has not been my experience. For me it did make a difference. So I feel if there is an issue, its worth checking out with both kind of plugs.

I was only talking about the plug btw... but of course, that is worth considering too... if the stock cap has ever been changed.

RX King Block


Rx King block from Indonesia is a direct fit and not the Malaysian one.

Malay block has 20ps whereas the Indonesian (esp from Jakarta) is a 14bhp one.

Confirmed, coz my friend installed this on his RXZ 5 spd and with RDD kit and DTW chamber, the bike is running like a rocket (in literal rocket sense). If not handled properly the bike scarily does wheelie on every gear, 5th gear too .

That apart the block is a direct fit.

Malaysian blocks need 6 speed gearbox and crank so the whole thing has to be replaced which dosent make sense.

You sure? wheelie on 5th gear!! That bike sure sounds like a crazy rocket. Did you ride the bike yourself and see?

Btw.. there is a 18 bhp RX King block too.

Are you sure about the "3KA" barrel performing so well. wheelie in 5th gear !!!!!

Don't mind, but where exactly is this bike? If its in B'lore i would love to have a look at this bike. Not often do you come across bikes which pops wheelie even in top gear. Am wondering what may be the top speed of this bike, please tell me its more than 200 Kmph.

Doc, i really have no comment for this guy's post here. All i can say is, we ride some modified 2-strokes, but our friend actually seems to be running a jet engine with ATF.

No maybe he is new to 2 strokes thats why. Even a crappy RX seems faster after riding a 4joke. and there is no shortage of expert advisors/ boasters once you step into the 2stroke world and it doesnt surprise me people get carried away after listening to some 'technical' terms from a fellow owner and start thinking of him/them as an expert!

That was uncalled for sir !!.... coming from someone whom i consider a veteran in Yamahas, and i have a lot of respect for you Nitesh sir. Your valuable comments in RDD and Teambhp has made me your admirer. But wasnt expecting that from you.

Well that bike does feel uncontrollable at most times. Its shot with Rxk engine, Rdd kit, DTW chamber (and yet its a non ported bike), 17" rims. Pulsar 220 front assembly with disc (this stabilized the bike somewhat). The bike gives out immense power. Since you are the "expert" i humbly request you not to consider my statements.

I dont want to justify my knowledge or "expert advices" which i am not. Just an admirer and an enthusiast is what i am.

Happy Biking.

Oh and the bike is in mumbai.

I am not endorsing that the bike is good, neither does it have a top speed of 200 .

The bike does a lot above other bikes that i have ridden. With proper sproketing done this is surely a monster in a mini package.

Technicalities apart i wouldn't prefer my bike to be Dr Jerkyll, i love the saga of a bassy 2 stroke engine note with thrilling gear ratios.

I read somewhere in this forum.... "Happiness is knowing that there is one more gear remaining"

I've seen an RXK in person. It isnt that great so as to wheelie in 5th gear.

Oh, the P220 front end is bloody heavy, ~3 times heavier than the stock frontend. Must be running something like 12/40 sprockets

The RXK block does have the grunt to lighten the front up under good acceleration, and does let the piston rev madly, but i dont feel it will pop a wheelie, especially in 5th.

There was nothing personal so dont worry about it.. I appreciate the admiration but let me tell you i too am not an expert in anyway. Im still learning and i believe its a never ending process. I was a clueless fellow once and most of the knowledge ive acquired over the years is from DIY and some reading.

Cheers!