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dt36

Bike Carbs (Fireblade) - Running Lean on Pinto

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Recently bought an RS2000 that has had a set of 42mm Fireblade carbs fitted. However, in fairness to the lad I bought the car from, he did not have the means to set them up properly whilst driving the car due to work committments etc.

 

Soon as I had the car, I took it to a rolling road, as the carbs were running really lean, no power, spitting back and popping at around 3000rpm. The main jets were tried with 160s, 175s and 190s, but all to no avail. When I drove it from the rolling road, the car was still running sh1tty and i was £150 out of pocket.

 

So, today I had a day off work and had my first proper play. :-D

 

My main goal was to just get it running right, so I targeted the Air Correction Ports first. Basically, I made up some blanking plugs and filed them to length so that they sat comfortably in the port and also behind the plastic plate holding the trumpets in place. Then, I got the strobe gun out and with the engine running and the distributor vacuum blocked off, I set the timing to 12* as opposed to the standard 8*.

 

Took the car up the road for a run and it is now running totally different. No spitting back and is way way sharper. Got dark before I had the chance to check the plug colours and adjust my needle jets, but I don't think they are much off.  Will probably have another play on the weekend to check them out.

 

After that, I am thinking of fitting a Lambda Sensor to my exhaust downpipe, so I can plug it into a Wideband AFR meter for that final bit of tweeking at home.  Then, hopefully I can get it down to Inter Pro in Bristol as I hear their chap knows his onions on the rolling road down there...

 

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Good info there chap,more information needed about bike carbs/ ITB set ups they do seem to be a "black art", going to fit GSXR throttle bodies to my Zetec over the winter, lets how that turns out :dope:

Let us know how you go.

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Good info there chap,more information needed about bike carbs/ ITB set ups they do seem to be a "black art", going to fit GSXR throttle bodies to my Zetec over the winter, lets how that turns out :dope:

Let us know how you go.

Cheers Old Skool Nutter.  My plans for a bit more tweaking this weekend have gone out the window. Painting down my daughters house all day today and just picked up a fastball from work tomorrow in Denmark. Customer has a brand new truck delivered and it's not playing right. Got to be on site first thing Monday morning to meet their engineer to hopefully sort it out.  However, I will now get 2 lieu days for this in the week, so if it's dry...

 

My carbs originally came off a Zetec engine and they were running fine on that engine according to the lad who owned it. He took them off for a Manta he was buying, but he never used them on it in the end.

 

So, on the Zetec, the air correction ports didn't cause any running issues. Maybe this is because the engines sensors report to the ECU and make the necessary adjustments.  My Pinto though is running a standard distributor and they were running like an absolute bag of sh1te.  So much so, I was thinking of taking them off.

 

However, I am pleased with them now as they sound really nice on induction, coupled with a single box exhaust. :D . I think you'll love the sound when yours is set up.

 

My next plan is to get the car out on a long open road and run it just above 3000rpm. Then, as I am holding the revs I will dip the clutch and switch off the ignition and cruise to a stop.  This will then allow me to pull a plug out straight away and read the exact colour of the plugs at this rev range. From this, I can then adjust the needle valve height to tweak the fuel/air mixture.

 

The other option is to fit a Lamda sensor and read it with an AFR Wideband gauge reader.  The adaptor plug for these is fairly cheap and you can get a sensor from the scrappies.  http://www.ebay.co.uk/itm/121115094630?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 

When the carb mixtures are set up to the best I can get them, I'll look at tinkering with the timing and cam vernier. This might be best done on a rolling road though by a professional.

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Gonna be running an Omex 600 for my set up this has a basic Zetec map so once the parameters are loaded it should run fairly well, then it will be off to Redline Tuning in Basildon for a RR session .

Wideband would be a good idea as i can feed this into the Omex and keep an eye on the mix. Enjoy Denmark, are work footing the bill £££

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Gonna be running an Omex 600 for my set up this has a basic Zetec map so once the parameters are loaded it should run fairly well, then it will be off to Redline Tuning in Basildon for a RR session .

Wideband would be a good idea as i can feed this into the Omex and keep an eye on the mix. Enjoy Denmark, are work footing the bill £££

 

I think that will run really sweet and Omex will give you good tech support I reckon.

That 600 series ECU has an input for a Lamda (02) sensor, so maybe get the boss fitted to your downpipe thats on ebay.  Additionally, they will also take a coolant sensor that you can wire into the ECU to assist cold starting, then you can then wire the output to a radiator fan.  Win win...

That is going to sound lovely when done :tongue: 

 

Yes, work always foot the bill, so I can't grumble at that.  Sat in the airport now waiting for my flight home. Truck was a quick fix after, which was a bonus.  The throttle pedal has 2x potentiometers fitted for safety and one of them had slipped outside of its parameters.  Quick calibration to the software map to bring both pots back to 100% on its  axis and job done.   It's always nice when you get a quick easy fix, plus it makes me look like I know what I'm doing...

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Trumpets are getting sent off tomorrow to DanST Engineering. 

For some reason, the carbs have 2 long and 2 short pairs. Going to get them cut and then Tig welded to 90mm lengths. 

Should help to get a better balance across the carbs and hopefully improve the torque curve. 

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New trumpets back and fitted. 

Recommend the service by DanST Engineering. Very friendly and helpful. 

Just need a black heater hose to manifold now and get rid of the blue. 

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4 hours ago, John escort mk1V6 said:

Will this gives higher revs or is this the goal ?

My main aim was to get all 4 trumpets at the same length, as 2 of them are intentionally shorter when fitted to a Honda Fireblade. 

However, longer trumpets should now give me a better torque curve. 

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😀You need jenveys ITB .I think you have maxed them bike carbs out and of course the jenveys would generate some more power from your new engine.

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36 minutes ago, preacherman said:

😀You need jenveys ITB .I think you have maxed them bike carbs out and of course the jenveys would generate some more power from your new engine.

I need more money... :-)

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3 minutes ago, dt36 said:

I need more money... :-)

That quote should be a logo on every throttle pedal !...lol

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  • Haha 1

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That quote should be a logo on every throttle pedal !...lol
That quote IS the motto for every ford owner!!!

Sent from my SM-G900F using Tapatalk

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We'll see if I've got any money left after building my other engine on which way I go. 😀 

The bike carbs are actually OK, but I think they're on their limit now. 

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