This guide is posted by MACHO. I think he will answer this query.

MACHO pls answer

Yup GSR and Fiero sports similar carburettor, its the Mikuni BS26.
Sure the tuning method would be similar,but truly speaking without a Tacho it would be difficult.
I never tune my Dad's bike(the thought never crossed my mind-it seems to go on forever ),he too rides the original Suzuki Fiero

What you must do,is warm the bike up by riding it for 15 minutes prior to the tuning session.
Next,since the Tacho is absent,I would suggest,u turn the fuel screw to lock,with the engine on-if the engine nears stall,raise the idling only a bit(as much required,not to stall) by the idling screw.Then turn the Fuel cock to almost 3.5-4.0 revolutions anti-clockwise from the closure point.If the engine seems to be at high idle at this point,lower it so that the engine beats sound regular.Enjoy the Fiero then

Definitely not,you are running a too rich mixture...........tune the carb soon,
or you would be awarded with an over heating and thirsty engine.

i really appreciate that ill do tuning according to your guide soon, n write about it
n yes engine has became thirsty in this condition its giving abt 45kmpl

I did a Pune - Shrivardhan - Pune ride spread over two days. Both days, I was riding for 2 hours in dark night, with my HIDs on. The light output given by HID is superb, and the halogens don't even hold a candle in front of them! I was riding at 4.5k RPM or above, so the battery charging was not an issue at all. I never had to use horn, because the cars n trucks n bikes would automatically give way to the light source approaching from behind! Really guys, if you are into touring, then HID is one upgrade worth saving for.

Sounds great if any then please post some photos

I have already posted pics of HID in this thread.

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Thanks MACH Bro... I've tried similar methods & Carb is OK at the moment ... I'm gonna try your method too ... until I tune it to perfection and be able to do it blind-folded. I guess it is a tria and error method.

I took all courage yesterday night to tune the bike myself... Here is what I did...

1. Started to tune as soon as I reachd home (to have warm engine)
2. Raised rpm to 3000 using the idle screw...
3. turned the fuel screw clockwise to bring down the rpm. It got locked with 2 turns itself and rpm still at 2000 rpm ... Guess it was a very lean mixture.
4. Using the idle screw, brought it to 1000 rpm where it was about to stall.
5. Now turned the fuel screw anti clockwise 4 turns and got rpm around 1400 rpm. This time the engine was running at a constant rpm.
6. Took her out for a ride... did not feel any difference.
7. Came back and repeated the steps. Again no difference.
Guess I did not mess it up because I did not get any problem riding. Today morning idling was about 1100 rpm and was constant at 1400 rpm when I reached office. So thought tuning was OK and there was some other problem.

My engine gets rough after 4.5K rpm after 20 mins of ride.. just now changed engine oil... I think I should ask the regional manager to take a look. Is there any other problem that could cause engine roughness.... Or am I having too rich mixture ???

Even the new GSR's carb is Mikuni?? I heard its Padmini make..

Hi everyone
IS the MOTUL 3000 4T 20W40 or the MOTUL 3000 4T PLUS 20W40 mineral oil.Since i am going to buy mineral oil for my GS which has completed 3.7k.

Motul 3000 4T Plus 20W40 thats what i got

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Is the Padmini different from the Mikuni ones. Could anyone confirm the shape and size etc. I'm sure it must be cheaper than Mikuni. what about the internals... are those different too??? I suppose one has to open the carb to see the insides, but any info would be appreciated. Mikuni BS26 = Padmini what??? what is the model? and what about the price. I'm also sure that the newer GS isn't having problems (carb related problems).

Is it mineral buddy.

yes I think new GSR too have same MIKUNI BS26 carb..
i own new model GSR
buddies my carb have vertically upward idling screw supporting throttle..on opposite side it has fuel screw near some wiring connected to carb