Performance mods for RX135? (In Pune)

[RX135]

For quite some time, I am toying around with the idea of either souping up good old RX135, or exchanging it with another powerful bike (No ZMA or P-180 for me, but something from Yamaha stable like Fazer 250). I am still not decided on it, but what possible modifications can be done on RX135?

I need your inputs on following:

1. Is it worthwhile to modify 5 year old bike?
2. My RX135 is 4 gear, so does it make sense to do just perf mods and no gear box change?
3. What all modifications can be done and cost for each? (I don't care about cosmetics).
4. More importantly, who can do it in Pune? Contact number? I don't want a road-side garagewalah to screw up the bike.

[typeOnegative]

Err, make it a favour for two.

[autozealot]

Ooops! Three I guess.........but in Mumbai pls

az

[mail4ajo]

Originally Posted by RX135

For quite some time, I am toying around with the idea of either souping up good old RX135, or exchanging it with another powerful bike (No ZMA or P-180 for me, but something from Yamaha stable like Fazer 250). I am still not decided on it, but what possible modifications can be done on RX135?

I need your inputs on following:

1. Is it worthwhile to modify 5 year old bike?
2. My RX135 is 4 gear, so does it make sense to do just perf mods and no gear box change?
3. What all modifications can be done and cost for each? (I don't care about cosmetics).
4. More importantly, who can do it in Pune? Contact number? I don't want a road-side garagewalah to screw up the bike.

Yet to quench your desire, you could do the following regular stuff:
1. Port and polish the Chamber
2. Put high performance Fibre REED Valves
3. Power air filter
4. Custom Expansion Chamber
5. Quick Throttle
6. Upjet your CARB
7. Get smaller sprockets up front

[RX135]

Originally Posted by mail4ajo

Yet to quench your desire, you could do the following regular stuff:
1. Port and polish the Chamber
2. Put high performance Fibre REED Valves
3. Power air filter
4. Custom Expansion Chamber
5. Quick Throttle
6. Upjet your CARB
7. Get smaller sprockets up front

Do I not have to replace whole gear box to 5 speed one? What would be approximate costs per each modification?

[mail4ajo]

Originally Posted by RX135

Do I not have to replace whole gear box to 5 speed one? What would be approximate costs per each modification?

Gear box replacement is really tough and expensive, stick to the stock.
1. Port and polish the Chamber - 2 -3K depending on machinist
2. Put high performance Fibre REED Valves - 750Rs
3. Power air filter - 1000-3000 depending on the brand
4. Custom Expansion Chamber - 1000-2000 based on make
5. Quick Throttle - 800Rs
6. Upjet your CARB-200-300rs
7. Get smaller sprockets up front - change entire kit-500Rs

[airfoil]

This is what I'd recommend:

* Buy a new 5 speed bore kit and head (the 5 speed bore revs out much better than the 4 speed bore) - this will cost about Rs. 4000 in all

* Polish the new bore and get a street port (mild) done on the bore by a
reputed tuner (cost can vary between Rs. 500 and 4000 depending on the tuner)

* Upjet the carb to match the new bore

* Install a UNI or K&N air filter - this will be a conical sorta filter which attaches directly to the carb and will necessitate the removal of your existing airbox (about Rs. 2500)

* Resprocket to the 5 speed sprocket kit (I believe it is 16/34 as opposed to 16/36 for the four speed) (~Rs. 500 for a new kit)

* Try to get your hands on an expansion chamber from a reputed tuner (PM me for details) (costs vary between Rs. 1500 and 4000)

* Install a Pulsar disk brake kit for the front - this is probably the best upgrade one could make for an RX (~Rs. 4000)

* Get the CDI unit replaced - a reputed B'lore based gentleman makes some awesome CDI units (~Rs. 2500)

* Replace the entire gearbox to that of a 5 speed - expensive route and not much recommended - it is probably better to sell your 4 speed 135 and buy another 5 speed instead (~Rs. 5000)

Do all of these performance mods and your bike will easily better the Pulsar 180s and the like.

Other optional upgrades include replacing the carb with a flatslide carb, & installing performance reed valves/spacers. You may also want to get your bike kitted out with a 100/90 lighting kit.

[Technocrat]

I know a guy with whom two of my friends have got their RXs(RX 100 & RX 135) ported. One of them also owns an RD & has got all his stuff on his RD done by the same guy.

Both of them are extremely happy with his work. I have seen some good bikes at his garage.

But some how people\member of RD Dreams call him Fake. i guess one of the RDD members was duped by him. Well for RD i cant say much because the parts are always an issue. But I think RX should be just fine.

So if you are interested I will let you know his workshop details.

[RX135]

All those mods are exciting, but without 5 speed gear box, I can't really use all the performance enhancements. And looks like 5 speed gear box costs a bomb (~5000 Rs.) I feel, instead of spending 15-20K on modifications, I might as well buy a new one. (Yamaha sucks big time. They still are going to launch F250).

[speedsatya]

Originally Posted by airfoil

* Get the CDI unit replaced - a reputed B'lore based gentleman makes some awesome CDI units (~Rs. 2500)

*.

details please .....

[mail4ajo]

How will changing the CDI unit help in making the performance better?

[Viju]

Hey RX135,

The 5 speed gearbox costs almost 8000/- brand new. But Yamaha does sell what they call a 'conversion kit' in which you change a couple of gears and a few components - you can get that for around 2200/-. The ratios will not be exactly the same as a 5 speed box, but you still have 5 gears to play with and it will benefit performance.

It's not necessary that you change to a 5 speed cyl-piston kit to get good performance. Ported 4 speeds can deliver good initial acceleration. Go for the 5 speed kit if you are more interested in the top-end.

@Speedsatya : The Bangalore-based tuner that airfoil has mentioned is none other than Mr. R.D. Chinoy who runs RDDreams. He sells a digital CDI for the RX series for approx. 1950/-.

@mail4ajo : It lets your bike rev out much more, the engine runs cooler, emissions are lower and if you have a light wrist on the throttle, will improve F.E. drastically. I have used this CDI on my RX135 and it resulted in a F.E. of 58.2 kmpl 'cos I ride very carefully. Have posted the review in the customer-feedback section of RDD. I think getting this CDI should be the first step for anyone looking to increase performance of their RX's.

Hope this helps.

[RX135]

How much of performance boost do these mods give out? In terms of torque and in terms of BHP?

@Viju: I was not aware of conversion kits. I'll check if it is locally available.