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**Aryan** · 10-07-2009, 11:19 PM

Query Approved.

**johnjojo08** · 10-07-2009, 11:27 PM

U can definitely install UCAL UCD 32 carb in ur P200. It will give u more fuel flow. Go ahead with it.

**jd666** · 10-08-2009, 12:56 AM

As per losing performance. how many kms has the bike done. Did u get the air filter replaced. Has the existing carburettor been cleaned properly?? Any extra vibes or anything else from the engine? What tyre pressure are you running currently? There are a lot of factors that can cause this. Eliminate each one, one by one, and see why your bike is not giving you the top end that it used to.

The carb can be fitted, and it will increase mid range and top end performance by improving the fuel flow for sure. But before doing that, i suggest increasing the main jet of your carb, and checking if the performance boost is worth it, rather than spending 3-4 k on a new carb.

**Bibhu** · 10-08-2009, 03:47 AM

Try changing your main jet with a 180 main jet. If that doesnot do for you then go for the 220 carb.

**abdelazeez** · 10-08-2009, 01:10 PM

Originally posted by jd666 View Post

As per losing performance. how many kms has the bike done. Did u get the air filter replaced. Has the existing carburettor been cleaned properly?? Any extra vibes or anything else from the engine? What tyre pressure are you running currently? There are a lot of factors that can cause this. Eliminate each one, one by one, and see why your bike is not giving you the top end that it used to.

The carb can be fitted, and it will increase mid range and top end performance by improving the fuel flow for sure. But before doing that, i suggest increasing the main jet of your carb, and checking if the performance boost is worth it, rather than spending 3-4 k on a new carb.

Hey JD666, well aware of the risk of sounding a bit too naive :- ) I ask this: How does upjetting the main jet (is there an 'upjetting' for another jet as well, or does the term 'upjetting' refer to only the main jet? How many jets are there in carb anyways -I do know of a 'slow jet' and a 'fast jet' being present in my dad's Bajaj Chetak; are motorcycle carbs the same?) increase the performance? Also, wouldn't doing that keeping with stock air-filter, cause the engine to run too rich? I've got a stock P180UG3 with me, and was considering a K&N coupled with upjetting to improve its perf -more specifically 'speed'- however the hard grunt-ish sound of a filter doesn't somehow go down well with me, and so I've kept the whole idea on the back-burner for now. Would simply upjetting the carb give me better performance? I did tune the fuel screw on the carb about 1-1.5 times causing my FE to come down between 25-30Kmpl, but the speed's increased quite a bit; if I reset that setting I lose out on the speed (of course, as expected)

I hope I haven't asked too many questions for one single post; but trust me, these are genuine queries. Your answers will be appreciated.

**jd666** · 10-08-2009, 02:00 PM

^^ the jets are the same in bikes, pilot and main jet, what upjetting does is it will increase the fuel flow, but the ratio will be determined by the carburettor.

When you unscrew the air:fuel mixture, it changes the AFR ( air fuel ratio ) to a richer mixture throughout the rev range of the engine. By upjetting, you get better control on the fuel flow. Yes a free flow intake will enhance this by allowing more air to flow into the carburettor. Especially when the throttle is fully opened, in the higher rev range, the fuel flow is restricted by the jet size. Upjetting ensures that the fuel flow is adequate even then.

Pm me your email id, ill mail you some tech info on mikuni slide carbs and tuning and upjetting.

**abhijeet080808** · 10-08-2009, 11:01 PM

Originally posted by Rajat Bhanti View Post

Hey guys i asking your opinion that will UCAL UCD 32 carb which is fixed in P220 canbe installed in P200 n can it provide me the best performance specs than the current carb in P200 n yeah can it be fixed in P200.

Hey there is one more help from you is that my bike is losing its pickup majorly in @ 5k - 8k rpm so what could be the problem coz earlier my bike was managing 130-134kmph speed but now it is hard to strech her to 130kmph. Soo guys help me out that what precaution should i take for it.

A new carb is not the way to solve such problems. How about giving the bike a general tune-up? Adjust valve clearance, clean spark plugs, oil the chain, clean air filter and replace engine oil. These are the things that should be done.

Originally posted by jd666 View Post

^^ the jets are the same in bikes, pilot and main jet, what upjetting does is it will increase the fuel flow, but the ratio will be determined by the carburettor.

When you unscrew the air:fuel mixture, it changes the AFR ( air fuel ratio ) to a richer mixture throughout the rev range of the engine. By upjetting, you get better control on the fuel flow. Yes a free flow intake will enhance this by allowing more air to flow into the carburettor. Especially when the throttle is fully opened, in the higher rev range, the fuel flow is restricted by the jet size. Upjetting ensures that the fuel flow is adequate even then.

Pm me your email id, ill mail you some tech info on mikuni slide carbs and tuning and upjetting.

The screw controls only the pilot jet fuel flow. It affect only the lower end. The mid and the top end is affected only by the main jet and the needle clip position.

And, the AFR ratio need to be correct. Too much fuel will not make any bike go faster!!

**jd666** · 10-09-2009, 01:55 AM

^^ then how does the bike run so rich, just by unscrewing the mixture screw???

**abhijeet080808** · 10-09-2009, 04:35 PM

Originally posted by jd666 View Post

^^ then how does the bike run so rich, just by unscrewing the mixture screw???

It will run rich only at the lower end. The top end is not affected by the tuning screw. That is the reason the main jet is there.

**abdelazeez** · 10-09-2009, 05:04 PM

Originally posted by abhijeet080808 View Post

It will run rich only at the lower end. The top end is not affected by the tuning screw. That is the reason the main jet is there.

@JD666: Thanks for your email man. It is indeed a good read and has some very interesting information on carbs and tuning.

@Everyone on this thread:
From the above few posts, would it be correct to infer that:
1) If one 'unscrews' the fuel screw (0.5 to 1 rounds, of course) in addition to 'upjetting' the main jet, the bike's performance in terms of speed will improve?
2) Additionally, coupling this setup with a good free-flow intake (i.e. say a K&N or some other good Filter), will add to the improvement?

Now (if both points are correct, that is), suppose someone only performs step 1. described above, without going in for a free-flow filter (i.e. step 2, above

**abhijeet080808** · 10-09-2009, 05:09 PM

Originally posted by abdelazeez View Post

@JD666: Thanks for your email man. It is indeed a good read and has some very interesting information on carbs and tuning.

@Everyone on this thread:
From the above few posts, would it be correct to infer that:
1) If one 'unscrews' the fuel screw (0.5 to 1 rounds, of course) in addition to 'upjetting' the main jet, the bike's performance in terms of speed will improve?
2) Additionally, coupling this setup with a good free-flow intake (i.e. say a K&N or some other good Filter), will add to the improvement?

Now (if both points are correct, that is), suppose someone only performs step 1. described above, without going in for a free-flow filter (i.e. step 2, above

A petrol engine gives best performance when AFR is around 13:1. Running richer than this will simply waste petrol and cause carbon deposits and damage engine oil. So, as bikes come properly tuned from factory, there will be no benefit from making the mixture any richer.

But, if a K&N is added, this ratio becomes leaner. In that case, fuel flow should be increased too.

**abdelazeez** · 10-09-2009, 05:28 PM

Originally posted by abhijeet080808 View Post

A petrol engine gives best performance when AFR is around 13:1. Running richer than this will simply waste petrol and cause carbon deposits and damage engine oil. So, as bikes come properly tuned from factory, there will be no benefit from making the mixture any richer.

But, if a K&N is added, this ratio becomes leaner. In that case, fuel flow should be increased too.

Hmm... Now that makes sense.
* Carbs are default tuned so fiddling with screws wont be of much help. (I wonder how it seems to work for my P180UG3. Guess Ill try undo-ing the change and and check if the performance changes)
* Adding a free-flow air-filter (giving MORE air to the carb) will cause it to run lean, but additionally if you upjet the carb (which jet do you increase BTW, just the _main jet_ I presume now), the AFR ratio will be corrected resulting in the bike giving out better performance.

**abhijeet080808** · 10-09-2009, 05:49 PM

Originally posted by abdelazeez View Post

Hmm... Now that makes sense.
* Carbs are default tuned so fiddling with screws wont be of much help. (I wonder how it seems to work for my P180UG3. Guess Ill try undo-ing the change and and check if the performance changes)
* Adding a free-flow air-filter (giving MORE air to the carb) will cause it to run lean, but additionally if you upjet the carb (which jet do you increase BTW, just the _main jet_ I presume now), the AFR ratio will be corrected resulting in the bike giving out better performance.

The screw helps a little because the bike is tuned for a balance between performance and fuel efficiency. The ratio is kept at something like 14:1. So there is a little scope for improvement at the cost of fuel efficiency.

If you fit K&N, you will have to upjet the main jet, and screw out the tuning screw. If the screw can be turned for more than 5 turns and performance still keeps on improving, you will need to upjet the pilot jet too.

**rookster** · 10-09-2009, 06:50 PM

Got it !

Guys even im keen on upgrading the performance of my unicorn. My top notch has gradually decreased to 110 (and yes iv done evrythng from clutch plate change to carburator setting to change of filter etc etc but nothing seems to be working)
So can you'll help me out here.

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