Australian Karting Forum
fitting of my fireball.
hey guys im just in the process of the install of the engine and accessories im bout to get a engine mount plus drill my own aswell.....after bit better measuring i am able to use it. now what has me bit stumped is the radiator. the mounts are there as well as mounting points on the chassis (ax6 28/30) but when the radiator is lined up the outlet at the top right of the radiator (looking from back) looks like its gonna go straight into the seat. unless i lay it right down im not sure how im sposed to mount it. can i please get some pics of owners to show how im meant to set it up.
ive also dont something lil different with the water pump s i dont have the lug to mount it behind the seat ive mounted it infront of the brake caliper (see pic) pluses of this are i wont need to remove axle to fit and replace water pump orings.
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water pump.jpg, 1.4 MB
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Replies to This Discussion
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Permalink Reply by paul nehme on -
was the only way i could get the ax9 bars to fit properly it still has full function n all. the ax6 ones come out of the chassis on an upward angle and the ax9 ones come out square,
on a different note engine mount showed up today im about to drill it b4 i finish lunch so hopefully have it fired up this arvo. -
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Permalink Reply by paul nehme on
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finished yay
well 95% done, engine fired up just gotta change my fuel tank to my new one and couple little bits n pieces. just a question is there a better low speed needle with a tee piece on it, its a bitch to try and adjust.
was a bit of a bitch to fire up, primed fuel up easy enough with the plug out but starter didnt wanna engage properly for a little bit then when it did turn over it was struggling b4 it fired, so i took the battery off and am giving it a charge now. will see how it goes after a charge.
heres couple pics too.
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finish1.jpg, 1.1 MB
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finish2.jpg, 1.1 MB
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Permalink Reply by Rishi Sabesan on -
you never really adjust the low speed or high speed needles while on track. if you really want to, some people braze small home-made t's onto the jets to extend them...
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Permalink Reply by paul nehme on
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sweet as, thanks heaps for that.
now im just itching for a drive lol
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Permalink Reply by paul nehme on
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hey guys is a return spring needed between the throttle cable and the throttle shaft on the carby....like i used to run on the clubby??
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Permalink Reply by Michael Hazelton on -
...ummm... not my advise to "not" use the adjustable jets... you can silver solder a washer (or similar) onto the jet when its removed from the carby, or get the pre-made italsport units from stgeorge kart centre (CRG).
Rishi Sabesan said:you never really adjust the low speed or high speed needles while on track. if you really want to, some people braze small home-made t's onto the jets to extend them...
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Permalink Reply by Michael Hazelton on
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Yes there is one available. You can also use a light tension spring (similar to trottle pedal spring) from the lever to the cahssis and hold it with a cable tie.
paul nehme said:hey guys is a return spring needed between the throttle cable and the throttle shaft on the carby....like i used to run on the clubby??
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Permalink Reply by Rishi Sabesan on
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so michael do you adjust on track? what are the advantages? and what do you adjust it according to?
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Permalink Reply by Michael Hazelton on
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The low and high speed mixtures balance the tune throughout the rev range to provide the ability to gain maximum power off the turns and down the straight. You are correct in a way, as most water cooled engines are "set-and-forget", but (at a pro level) adjusting the jets can make your starts better, engine temp management throughout a race and also change the power band to suit certain tracks or race conditions.
Personally, I am on the jets whenever i feel the engine needs it. But i first learnt to tune 100cc reed valve rocketships, with the assistance of one of the best engine builders, when i was 12 (that was more than 20 years ago). Others who I assist at the track will mostly leave them alone during a session (race or practice), check the plug on return to the pits and adjust accordingly for the next session
Different tracks types (eg; long straight / short straight), different altitude, different weather and even different engine build setups can change the desired tune of an engine.
My recommendation for anyone new to Fireball's (or any engine) is send the carby to Ken Mitchell (RKS at Stgeorge kart centre) and run it as he says as he is the carby king. I would then talk to everyone I could to understand reading the plug and tuning the jets.
Units like Easytune and Alfano oxy meters can be very handy and aid this process greatly.
60% of drivers wont feel the difference of any tune (good or bad). 70% of drivers will never figure it out or even want to. 80% of drivers will not be good at it. 50% will blame the tune being wrong (especially in a rotax) for their bad performance.
I am sorry but the is literally not enough time in the day to try and explain all the theories and practices to tuning carburettors.
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