Harley carb upgrades?

**awayatc** · 11th August 2010, 00:38

I am thinking of getting a Mikuni HSR 45 for my 88 TC Heritage...
According to the write ups it increases HP a fair bit....
if used with free flowing pipes 25% over stock is claimed.
Just wondering if anybody here has any experience with with any of the carb upgrade options...

**admenk** · 11th August 2010, 12:57

Thought about this as well for my '91 Softail. Either a Mikuni or S & S. Problem is that it's not' cheap, and in the end, with me being a tight arse, I thought I'd just keep standard carb and change the air filter. Mind you, I'm no Harley expert and I only potter along anyway, and if I wanted performance, I'd buy a different bike for a lot less ! Be interested to hear how you get on though.

**BIG DOUG** · 11th August 2010, 18:31

I presume your bike is still 1450cc's if so a 42mm would be good I only use the 45mm on motors over 1550 with good heads and exhaust, filter and cams and ign on my 100ci dyna I run a 45mm my mate jason has a 131ci mtr and runs the 48mm mikuni.

**awayatc** · 11th August 2010, 21:21

Yes, motor is still stock 88......
Just that there is a 45 for sale at the moment for a reasonable price on Trademe
If not I would indeed go for the 42mm .......
I have only put a K&N filter on mine, and the exhaust isn't standard, but not sure what it is.
The Airfilter livened the old girl up a bit, and I wiouldn't mind a bit more umph without spending ridiculous amounts.....
So the 42mm or 45 mm would be worth my while you think?

**Crasherfromwayback** · 11th August 2010, 21:24

Originally Posted by awayatc

Yes, motor is still stock 88......
Just that there is a 45 for sale at the moment for a reasonable price on Trademe
If not I would indeed go for the 42mm .......
I have only put a K&N filter on mine, and the exhaust isn't standard, but not sure what it is.
The Airfilter livened the old girl up a bit, and I wiouldn't mind a bit more umph without spending ridiculous amounts.....
So the 42mm or 45 mm would be worth my while you think?

Boring your stock carb is a good mod for the $'s too. We do that at WMCC for you. CV carbs work well for most street applications.

**bsasuper** · 12th August 2010, 19:06

I dont understand why HD owners want to get more HP. If HD cant get a decent amount of power from 96 cubes, or rev tec etc etc, then just give the motor development back to AMF motorcycles (aka kawasaki) and they will sort it.

**BIG DOUG** · 12th August 2010, 22:24

because they are the small bock chevy of the motorcycle world

**Headbanger** · 14th August 2010, 08:55

I imported a Mikuni from the states, had it in my grubby paws for approx $300 NZD. Bought the setup without the mounting kit.

Bastard mechanic told me I was a cunt but he still installed it, it was like night and day. Bike really came to life.

**Hortz** · 18th August 2010, 20:37

I put a 42mm mikuni for my 87 fatboy. Mikuni cabs do cough a bit until it warms up.... mm couldd just be mine (damm)

**MeHigh** · 19th August 2010, 16:53

Dynojet the old CV carb for a stage 4 ( I have on my bike stage 7 but I wanna bore it to 95) ! Nothing less comparing with Mikuni 45 or S&S, except the $.

**MeHigh** · 20th August 2010, 14:39

Originally Posted by Hortz

I put a 42mm mikuni for my 87 fatboy. Mikuni cabs do cough a bit until it warms up.... mm couldd just be mine (damm)

Had problems with Mikuni 45 as well... running rich, running lean twick the shit out of it for ages... changed it back to my ol carb, rejet it and good as gold - like Mikuni when was running perfect( i have a high flow filter and V&H on it)

Crasherfromwayback - what's with the boring the carb? Where , how $ and what's the deal?

**awayatc** · 21st August 2010, 09:56

ordered new 42 mm for just over $400.
Wait and see now.
Screaming eagle airfilter made noticable difference.
so am hoping carby will be similar at least.....

**porky** · 21st August 2010, 21:05

Originally Posted by MeHigh

Dynojet the old CV carb for a stage 4 ( I have on my bike stage 7 but I wanna bore it to 95) ! Nothing less comparing with Mikuni 45 or S&S, except the $.

Whats stage 7 ?