AKHILJAIN

Hi there,

I have a pulsar 150, 2003 model, one of the oldest variants of Pulsar (With self start). I have been using it for quite some time and I feel the need to do some modifications to enhance it's output.
Right now, I have set my bike on a mixture which is neither lean, nor rich, and it does give me a very good response. The changes I am planning are for an even better experience.

1: I am planning for a re-jetting of the carburetor.
2: Increasing the size of the rear sprocket for better pick up.

I am not much interested in the cosmetic changes as such, but what I need to know is:

If I don't go for re-jetting and run my bike on a lean mixture, provided I do change the rear sprocket to a bigger size, I'll have a better pick up, but my top speed will go down, is there a way i can manage that?

If I re-jet, the pick -up and top speed are maintained, but the engine efficiency goes down.

Please tell me if I can somehow manage to cut a better deal, not loosing too much on one particular thing.

Noor

Query approved

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revvhard

sprocket changing is a process of trial and error, you will have to find the sprocket setup that works for your needs and that could take quite a lot of time,
rejetting of the carb will allow more fuel to enter the engine but you would also need mor e air for combustion, and truthfully, the gains from freeflow airfilters and rejetting are not really that much,try sprocket changing but be prepared to spend some time and money on it :-)

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Samarth 619

Are you currently running lean? What are the effects? Does the engine overheat?

I think you're confused, so I'll just repeat the basic rules:

Lean burning increases efficiency and performance of an engine, but it will make it hotter than before. This heat, on long trips will decrease performance/ mileage too and might even stall the engine. Long term problems may occur.
Slightly leaner burning is ok though.


Bigger rear Sprocket will undergear and increase acceleration, but highway mileage will go down. City mileage may remain almost constant, or maybe increase a bit with good & peaceful "top gear only" riding...
Top speed is not always affected, as under-gearing makes you reach good speeds in lesser time...

parminot wahlang

you can use a bigger sprocket like every one says,it may help but using it may unable you to fix the chain cover which is not wise when you have to do a long a long distance travel everyday coz i have tried it myself and atleast once a week i'll have to adjust the chain slack which is hectic.