6 replies to this topic

[jam2005]

I now have a HS4 carb and standard air filter fitted in my mayfair. Im wanting to get a K&N tapered air filter to start to help make up a stage 1 kit. Which carb (HS4 or HIF38) would I get the best performance out of and which K&N filter (Pancake, Tapered) should I use? I here that the HIF38 carbs with a tapered K&N air filter is best, but will this suit my mini? Please help. jam2004! :grin:

Pik of a HIF38 carb with pancake style K&N air filter and water heated inlet manifold posted.

[cowboy]

depends on the size of your engine, if you've only got a 1000 or smaller i'd go for the hs4 with cone shaped k&n, (my carb has an AAA needle fitted on a 998 engine), and maybe a differant needle. you could use the HIF38 on the smaller engine also, but the larger engines, I would say yes use the HIF44, again with a cone filter. :wales:

[jam2005]

It's a 998cc! :erm: Wots the best needle to use n-all?

[TimS]

HIF carbs are later carbs and use a bi-metalic strip so work better at different tempretures. On a 998 i would use a HIF38, the 44 would just be too big unless the rest of the enge was modified. Filter wise the taped cones have more surface area than the pancake so i would go for these... as for needle it take it to the local rolling road to have it set up and get them to machine you one

[Dan]

I agree, definitely the HIF38. It is the same size as the HS4 anyway just a more modern improved design. The cone filter will flow more air than the pancake but you might get some icing issues with it due to that. Cone for ultimate power and induction noise, pancake for less roar and still good, usable road power.

[Bluemini]

Go with the smaller carb for a 998. I spoke to my mate who works at the rolling raod and he says the oval pancake filters are better than the round pancakes and the cones for air flow into the carb.
What does HS stand for? I know the IF bit of HIF stands for 'Internal Float' Anyone know the other??

[Dan]

HS Horizontal, Side float chamber

HIF Horizontal Integral Float chamber

And I think KIF is for K-series Integral Float, 'because it was only fitted to the K-series Metro AFAIK.