13 replies to this topic

[micrawavewindow]

hi my mate has a 998 and it was doing 16mpg which is not good so he took it to a guy whi tweeked with the carb and now he is getting 45mpg just from a 10 minute tune.now my 1275 is doin about 15-20 mpg which is not good but i cant really afford to get it tuned by the same guy i wish i could, but is there any way i can just set the carb to a certain setting. i was thinking like screw all the screws in and then screw one out one turn and the other out 2 turns now is this possible i hope this makes sense also if you have any advice could you give a quick description of where the said screw is
thanks in advance

[micrawavewindow]

anyone please help

[mars red mike]

To be honest mate that sounds like a recipe for disaster. If you dont know what you are doing save yourself the aggro and leave it to someone who does.

[micrawavewindow]

i know what you are saying i do have quite a bit of mechanical knowledge as i am second year student on motorcycle mechanics but as for cars i am not as sure but with a little guidance i think i will be fine but thanks for the view anyway

[Twincam]

Have a read into the Colourtune kits which are available from places such as MiniSport - Never used one myself though!

[Twincam]

To be honest mate that sounds like a recipe for disaster. If you dont know what you are doing save yourself the aggro and leave it to someone who does.

^^ I'm with him.

[Pooky]

There is no magic set number of turns that give best economy/power etc. There are lots of factors to take into account when tuning a car and they all have to be set up together. Whereas your mate only needed 10 mins work on the carb (?) you may need a full service and timing set up etc etc.

[bmcecosse]

Forget colourtune! It's not necessary with an SU carb. What carb is on the car ? If it's an HIF - the mixture screw is at the ~ 10 o'clock position - screw it in/out until you get the best/most even idle. Then adjust the idle speed -then tweak the mixture again etc etc until it's smooth and steady. Surely on your course - there is someone (maybe even a lecturer?) who have a look at it for you! Note - you also need to optimise the idle timing - and that may affect the best mixture setting - so you may have to reset them a couple of times to get it just right!

[Blitzman]

What are your mods and what carb do you have?
Have you tried the "Haynes" approach of pushing up the pin below the dashpot to see how it reacts?

[Blitzman]

What are your mods and what carb do you have?
Have you tried the "Haynes" approach of pushing up the pin below the dashpot to see how it reacts?

[micrawavewindow]

all mods are to the bodywork not the engine which is 1275 metro with a su carb

[micrawavewindow]

they have a full rolling road but i cant get to college at the mo due to the snow but it will be goin in next week i just thought i could try and set it up because they like you to try yourself instead of justing dumpin it on them is the procedure the same for the su carb

[bmcecosse]

They are all SU carbs - you probably have an HIF 44. google it!

[micrawavewindow]

will do ta