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Old 22nd September 2011, 22:45   #1
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Thumbs up First Timer- Restoring a Yamaha RX 135 4 speed

I am a big fan of 2stroke bikes , i have owned several bikes in the past, but i always wanted to pick a junk bike and restore it from scratch after a long search found a 2000 model in a bad condition, price quoted was 23k and after negotiation picked it up for 19k, could not wait for long to ride it, so stripped it completely ,there was lot of rust ,got it completely painted all, silver parts were painted grey the other parts were painted red there was on work on the engine so the build happened in 2 weeks, now i have a problem which i think the gurus will be able to help me

1. The bike is currently running on first oversize(.25) my mech told me the piston has been damaged and a rebore is needed, i want to know what will be the FE after that.

2. There is a another problem the bike starts to flutter in any gear i have changed the main and pilot jet and also float pin but no difference the FE now is about 20kmpl i want to use this bike as my daily ride so please help in resolving this issue. pic of the build will be uploaded shortly.


Pics of before and work in progress
Attached Thumbnails
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First Timer- Restoring a Yamaha RX 135 4 speed-19092011031.jpg  


Last edited by PowerPort : 24th September 2011 at 14:27.
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Old 29th September 2011, 00:17   #2
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

Quote:
Originally Posted by PowerPort View Post
I am a big fan of 2stroke bikes , i have owned several bikes in the past, but i always wanted to pick a junk bike and restore it from scratch after a long search found a 2000 model in a bad condition, price quoted was 23k and after negotiation picked it up for 19k, could not wait for long to ride it, so stripped it completely ,there was lot of rust ,got it completely painted all, silver parts were painted grey the other parts were painted red there was on work on the engine so the build happened in 2 weeks, now i have a problem which i think the gurus will be able to help me

1. The bike is currently running on first oversize(.25) my mech told me the piston has been damaged and a rebore is needed, i want to know what will be the FE after that.

2. There is a another problem the bike starts to flutter in any gear i have changed the main and pilot jet and also float pin but no difference the FE now is about 20kmpl i want to use this bike as my daily ride so please help in resolving this issue. pic of the build will be uploaded shortly.


Pics of before and work in progress
To your Point 1: - You can go for rebore, offcourse don't ask for mileage from RX, my bet would be around 30+ if it is tuned good. Remember lean mixture would give good FE however, would ruin your bore in the long run.

To your Point 2:- If I were you would go like this.
1. Check if the spark plug is good.
2. Clean the carb and ensure pilot and main jets are dirt free.
3. Clean/Replace Air Filter.
4. Air Fuel Screw tuning should be apt for flutter free.
5. Quality of fuel.
6. Right mixture of 2T oil to a liter of petrol ( 30ml is recommended by Yamaha)

Seniors please feel free to correct if I had missed out any for the thread starter should know.
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Old 29th September 2011, 08:26   #3
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

Thanks sriram for the suggestion the fluttering has stopped now.
The things I did were
1.changed the spark plug to NGK recomended by many bhpians.
2. Changed the airfilter.
3. Replaced main jets to the old one which was in the bike earlier.
After all these changes the bike is running well, FE has also improved.
FE is abt 35+, as I don't have a spedo one the bike do not the exact figures.
There is another concern, I have replaced the rings and the is a strange sound, my mech told me that the sound will reduce after some time,well is it true? If yes how long will it take?

The after pics will be posted shortly.
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Old 29th September 2011, 16:53   #4
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

Finally found time to click some pics, would expect you all to comment one the final outcome, also some suggestion will be of great help.

Regards
Attached Thumbnails
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Old 29th September 2011, 17:35   #5
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

Nice colour on the machine. The typical red!
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Old 30th September 2011, 06:38   #6
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

Nice restoration, painting looks good. Any reason why you have taken off the speedometer console? Appears a bit gross in that area coupled with the non standard head light stays
Job seems to be well done and congrats for your ride.
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Old 5th October 2011, 23:15   #7
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Angry Re: First Timer- Restoring a Yamaha RX 135 4 speed

Quote:
Originally Posted by PowerPort View Post
There is another concern, I have replaced the rings and the is a strange sound, my mech told me that the sound will reduce after some time,well is it true? If yes how long will it take?
I still have not been able to sort this issue, any suggestions?

Regards
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Old 6th October 2011, 03:03   #8
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

^^^
What exactly was that strange sound? After the rings replacement you could hear humming noise for around 1k km. Try changing the engine oil after 1k km.
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Old 6th October 2011, 08:47   #9
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

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I still have not been able to sort this issue, any suggestions?

Regards
Where is this noise originating from? Is it from the Engine Bottom or the Cylinder? If its from the cylinder, then problem would be the clearance that would be given during the reboring. This will not impede much except for a irritating ride.
If its a noise from Engine Bottom need to isolate the source which is causing this noise.
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Old 6th October 2011, 10:31   #10
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

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Originally Posted by SriramEfunds View Post
To your Point 1: - You can go for rebore, offcourse don't ask for mileage from RX, my bet would be around 30+ if it is tuned good.

6. Right mixture of 2T oil to a liter of petrol ( 30ml is recommended by Yamaha)

1. RX135 4 speeders are known for their good FE. With controlled riding, u can expect as much as 40-45 kmpl. I have known bikes to deliver 47-48 under careful riding using the very accurate reserve to reserve checking method.


2. Yamaha NEVER recommends premix ratios coz the bike is always expected to be run on the autolube system.

30ml/lit is the approximation used by rx riders using oilpumps with the fact that 1000 ml of 2t oil is used up every 1000 km. So assuming the rx has FE of 30kmpl, 30 ml oil will be used per liter.

That is just an approximation.

Please stick to the oil-pump.

Last edited by alok_balsekar : 6th October 2011 at 10:32.
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Old 6th October 2011, 22:30   #11
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

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Originally Posted by ku69rd View Post
Where is this noise originating from? Is it from the Engine Bottom or the Cylinder? If its from the cylinder, then problem would be the clearance that would be given during the reboring. This will not impede much except for a irritating ride.
If its a noise from Engine Bottom need to isolate the source which is causing this noise.
The noise is from the cylinder , as my mech had told me that piston is damaged and said that the sound might reduce after some kms(carbon deposit), but I have used the bike for more than 500 kms but no difference.
Is it advisable to rebore and put a .50 piston, and what will be the expected FE? As I intend to use the bike as my daily ride.
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Old 8th February 2013, 14:21   #12
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Default Re: First Timer- Restoring a Yamaha RX 135 4 speed

PowerPort,

Can you please let me know where you have do the restoration ? Is thisMch still available ? I recently accuired a Rx 135 4 speed and it needs a Pait job

Help much appreciated
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