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**sunilg** · 02-03-2011, 12:41 PM

Query approved.

**aargee** · 02-03-2011, 01:00 PM

@Bhibu - What's the venturi size of your DSlide carb? If its anything more than 24 mm, then ditch the carb & get yourself a regular or OE. I've been struggling with a TM28 for over a year now. I'm sure none of the AFR screws, jets will do the magic, even if it does, you'll not be able to idle. Its a pain unless the cylinder is ported.

**Bibhu** · 02-03-2011, 06:41 PM

@Sunil: Thank you.

@Argee: It is a 26mm Carb. On the pulsar we fixed the problem by jamming a wire in the main jet, but the same approach is not working for the rx. There is no problem with idling but the bike flutters a lot and as mentioned before the engine flooding.

PS: Now I understand your hunt for for the oe carb. I am sill on it though.

**abhimanyu31** · 02-03-2011, 07:06 PM

Originally posted by aargee View Post

......I've been struggling with a TM28 for over a year now. ...

Even with a ported cylinder you are going have a problem... a TM28 will flow 20% to 40% more than a conventional VM28... that is why you will normally find that as a practice a smaller venturi flat slide is used compared to a conventional carb... you should have selected a TM24... it is the ideal size...

**aargee** · 02-03-2011, 07:11 PM

Originally posted by Bibhu View Post

It is a 26mm Carb. On the pulsar...mentioned before the engine flooding

What's the current jet size? It should be ideally 165/17.5 with VM22 carb. Now, being 26mm, I'm assuming that the main jet would be 190 & pilot to be 22.5, pls correct otherwise. Now what would happen is, even if you buy the jets separately (assuming Mikuni models that are compatible), the venturi size is something that literally has a curse (don't ask me the theory). If you idle it, you'll not have a good response when you wrist the throttle (move to main jet), otherwise, sacrifice the idling & you'll get a good response from the mains. Now it is when you try to make a balance on both, you'll experience the flutter.

Originally posted by Bibhu View Post

PS: Now I understand your hunt for for the oe carb. I am sill on it though.

Lol; I'm not trying anything more with TM28 & Rx unless the cylinder is ported.

**aargee** · 02-03-2011, 07:14 PM

Originally posted by abhimanyu31 View Post

Even with a ported cylinder you are going have a problem...

Bet you beer to dollar, if the cylinder is ported (not sure at the intake or at the exhaust & by how much), this WILL NOT OCCUR. I once had a ported cylinder & that is when TM28 came into picture. Since that cylinder was a sleeved (the damn mech) I'd to switch to stock cylinder after which all the issues started. BTW, one cannot use a stock airfilter as well as AM filters such as UNI too. The stock has to be altered for it.

PS - With the ported cylinder & TM28, the ride on Rx is a dream. I've kicked the ass out of several P200 on both pickup as well as top end. If the job is done properly, trust me, its a serious game altogether.

**SriramEfunds** · 02-03-2011, 08:24 PM

@Bhibu - Nice you see online after a long long time. I'm watching this thread would post appropriately. This is the first time I'm seeing your post after you left Chennai. Sorry for OT.

**Bibhu** · 02-03-2011, 10:33 PM

Originally posted by aargee View Post

What's the current jet size? It should be ideally 165/17.5 with VM22 carb. Now, being 26mm, I'm assuming that the main jet would be 190 & pilot to be 22.5, pls correct otherwise. Now what would happen is, even if you buy the jets separately (assuming Mikuni models that are compatible), the venturi size is something that literally has a curse (don't ask me the theory). If you idle it, you'll not have a good response when you wrist the throttle (move to main jet), otherwise, sacrifice the idling & you'll get a good response from the mains. Now it is when you try to make a balance on both, you'll experience the flutter.

Lol; I'm not trying anything more with TM28 & Rx unless the cylinder is ported.

Spot on with the jet size. unfortunately the Mikuni jets are not compatible with the Keihin as they physycally do not fit in to the needle jet. I have tried with jets from my old carb.Regarding the idling, well idling is not at all a problem. as I have stated before it is the flooding that has me worried. Today fuel started coming out of my exhaust also. I am thinking about trying to get the carb fixed at the local carb shop.

Originally posted by aargee View Post

Bet you beer to dollar, if the cylinder is ported (not sure at the intake or at the exhaust & by how much), this WILL NOT OCCUR. I once had a ported cylinder & that is when TM28 came into picture. Since that cylinder was a sleeved (the damn mech) I'd to switch to stock cylinder after which all the issues started. BTW, one cannot use a stock airfilter as well as AM filters such as UNI too. The stock has to be altered for it.

PS - With the ported cylinder & TM28, the ride on Rx is a dream. I've kicked the ass out of several P200 on both pickup as well as top end. If the job is done properly, trust me, its a serious game altogether.

Port the cylinder with BIG exhaust duration, Massive transfer setup and big a$$ reeds with a rd piston, then may be this damned carb of mine will work.

Originally posted by SriramEfunds View Post

@Bhibu - Nice you see online after a long long time. I'm watching this thread would post appropriately. This is the first time I'm seeing your post after you left Chennai. Sorry for OT.

This is the first time I am posting after nearly a year as I was busy a bit. Sure missing u guys.

**aargee** · 02-04-2011, 03:32 AM

@Sri + 1

Originally posted by Bibhu View Post

Spot on with the jet size.

WTH??? Sry Bhibu, if your reply is for 190 & 22.5, then, sry my friend, you're killing the cylinder as such & no wonder the fuel is coming through exhaust. Do not even idle it pls.

Originally posted by Bibhu View Post

Regarding the idling, well idling is...out of my exhaust also.

How about the 1/8th & 1/4th of throttle responses? Those are little more than idle & when MJ & PJ are put to work.

- When you open up the throttle, are you getting a bog down followed by roar of the engine?

- Also how is the response when you close the throttle after opening the throttle full? Does the roar (read high pitch engine noise) come to idle as quick as possible (read almost a second) or takes a 2-3 seconds or even more?

- Are you able to ride? If you're able to, are there any jerks at any point, like when you close or open the throttle?

Originally posted by Bibhu View Post

I am thinking about trying to get the carb fixed at the local carb shop.

Well, IMO, no matter how much ever the local guys are knowledgeable, DO NOT try any juggad, you never know when it conks off or its still in the head that something is not put it in the right way & had to be deviated. But that's just me.

Originally posted by Bibhu View Post

Port the cylinder with BIG...carb of mine will work.

Port the cylinder just because you don't want to change the carbs

? Wouldn't half the cost of it get you another std carb?

**Bibhu** · 02-04-2011, 01:01 PM

Originally posted by aargee View Post

@Sri + 1

WTH??? Sry Bhibu, if your reply is for 190 & 22.5, then, sry my friend, you're killing the cylinder as such & no wonder the fuel is coming through exhaust. Do not even idle it pls.

How about the 1/8th & 1/4th of throttle responses? Those are little more than idle & when MJ & PJ are put to work.

- When you open up the throttle, are you getting a bog down followed by roar of the engine?

- Also how is the response when you close the throttle after opening the throttle full? Does the roar (read high pitch engine noise) come to idle as quick as possible (read almost a second) or takes a 2-3 seconds or even more?

- Are you able to ride? If you're able to, are there any jerks at any point, like when you close or open the throttle?

Well, IMO, no matter how much ever the local guys are knowledgeable, DO NOT try any juggad, you never know when it conks off or its still in the head that something is not put it in the right way & had to be deviated. But that's just me.

Port the cylinder just because you don't want to change the carbs

? Wouldn't half the cost of it get you another std carb?

Changed back to the oe carb today. Bike is running fine.

I will ask the local guys find smaller jets for the carb. The Porting thing was just frustration talking.

The bike was starting fine but bogging down at full throttle and fluttering at half.

**aargee** · 02-04-2011, 01:42 PM

Originally posted by Bibhu View Post

I will ask the local guys find smaller jets for the carb.

Well, even if you find smaller jets, I doubt if it would solve the issue. On 28 yes, it WILL NOT, but on 26, I'm still doubtful as I haven't tested to say something concrete. My experiments with 28mm lead me to believe that the venturi is the culprit no matter what size of jet you use. So that might be appliacable in your case too.

Originally posted by Bibhu View Post

The Porting thing was just frustration talking.

Sry my friend, but that's just the Rx on bigger carbs

Originally posted by Bibhu View Post

The bike was starting fine but bogging down at full throttle and fluttering at half.

Precisely my problem too

**Bibhu** · 02-06-2011, 12:22 AM

I am not giving up on the carb issue. However I have decided to go for some other ways to increase the overall performance of the machine which include the rdd cdi, magnet and coil kit, fiber reeds and the soup bowl. Any other suggestion guys?

**psr** · 02-06-2011, 12:54 AM

Originally posted by Bibhu View Post

I am not giving up on the carb issue. However I have decided to go for some other ways to increase the overall performance of the machine which include the rdd cdi, magnet and coil kit, fiber reeds and the soup bowl. Any other suggestion guys?

Good fiber reeds will give you the most bang for bucks than the others.Carburetors are a pain to adj and setup.There are many parameters which need not follow set principles.Venturi Velocity is one of the terror to strike any tuning.Better to stick to stock Carb and do mods like jet,needle position,AF ratio adj...This may be a tame proposition,but will save you from banging your head against the wall.Just my thought.

**aargee** · 02-06-2011, 02:00 AM

Originally posted by Bibhu View Post

rdd cdi

This will only ensure clean burn, no performance improvement

Originally posted by Bibhu View Post

magnet and coil kit

Again no noticeable performance, but only to increase the output to get better lighting

Originally posted by Bibhu View Post

fiber reeds

Ok, but again, you'll need to improve the intake manifold completely which includes...CARB & upjet + Unifilters, sprocketing, 5 speed gear box, head mod if possible & finally when you're unhappy, start playing with cylinder

Originally posted by psr View Post

Carburetors are a pain to adj and setup.

Lol!!! True, learned the hard way

Originally posted by psr View Post

Venturi Velocity is one of the terror to strike any tuning.

Appreciate some light on this pls?

Originally posted by psr View Post

Better to stick to stock Carb and do mods like jet,needle position,AF ratio adj...

PERFECTO!!! and this is what I too suggest strongly. If one still insist on bigger carbs, then, leave it to a competent mech with the downfall being no matter what happens, that guy should be trusted even for a washer change

Originally posted by psr View Post

This may be a tame proposition,but will save you from banging your head against the wall.Just my thought.

Not only your thought, I too agree on this front.

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