RD350LC Carb choice

A place for LC enthusiasts to hang out!

Moderators: rztom, 2smoke

Post Reply
Message
Author
AZRD350LCGUY
Posts: 58
Joined: Sun Feb 21, 2016 6:53 pm
Location: Gilbert, az

RD350LC Carb choice

#1 Post by AZRD350LCGUY » Wed Jun 28, 2023 6:24 pm

I have been looking to replace the original crab on my 1982 RD350LC. It's bored to 375 cc otherwise stock. Would Banshee, RZ350, or are there better low cost carbs that would well?
Suggestions!
1982 RD350J aka RD350LC Canadian
1971 Kawasaki F5a Big Horn
2013 NC700X

Judge people by what they do and not what they say they will do.

75RD350rider
Posts: 607
Joined: Thu Jun 19, 2014 9:52 pm

Re: RD350LC Carb choice

#2 Post by 75RD350rider » Wed Jun 28, 2023 10:51 pm

Is there anything wrong with your stock carbs? Are you running stock pipes or expansion chambers? The stock carbs work very well on stock motors. That being said, I am running TM32 flat slide Mikunis on my aircooled 75 RD350 with Moto-Carrera pipes, stock porting and a good set of single petal reeds and it improved the performance and gas mileage considerably.
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA

(F5)
Posts: 630
Joined: Mon Sep 27, 2010 7:21 pm
Location: Wellington New Zealand

Re: RD350LC Carb choice

#3 Post by (F5) » Thu Jun 29, 2023 4:13 am

Many people put Keihin PWK28 crabs on thier RZ350s. Must better than Mikuni. Dont see why shouldn't fit on the earlier LCs.
KR1 used to provide donors but hens teeth now. KX85 used them and still available new.

Of course there are lots of knock off Chinese versions of the PWK. Oh you will be tempted.
I've spent enough time trying to settle them on mates bikes. I'd only ever buy the Japanese originals. As I have more than once.
496 Cheetah. TSS PVs, PWK35s, Ignitech, RGV(ish) chassis

Darrell
Posts: 184
Joined: Thu Feb 22, 2018 6:21 pm
Location: Crab Orchard, TN

Re: RD350LC Carb choice

#4 Post by Darrell » Thu Jun 29, 2023 8:10 am

I'm running the stock carbs on my Canadian-spec RD with Toomey pipes and mild porting. They work great and flow all the fuel I need for my set-up. Back in the late 80's I raced an RZ with a full Spec II set up (carbs, pipes, porting, crank) and the Spec II modified Mikuni 32's gave me no trouble at all.
89 Canadian Spec RD-350
2013 BMW R1200RT
2007 Harley XL1200C Sportster
2008 Ducati 1098R
2015 Gas Gas 300 Trials bike
1972 Turbo-Charged 240Z
Zastava Black Arrow .50 BMG

AZRD350LCGUY
Posts: 58
Joined: Sun Feb 21, 2016 6:53 pm
Location: Gilbert, az

Re: RD350LC Carb choice

#5 Post by AZRD350LCGUY » Thu Jun 29, 2023 8:30 pm

I have been thinking of the Kawasaki KX85 but they do not have a fitting for the oil pump and I want to keep that.
Frank
1982 RD350J aka RD350LC Canadian
1971 Kawasaki F5a Big Horn
2013 NC700X

Judge people by what they do and not what they say they will do.

75RD350rider
Posts: 607
Joined: Thu Jun 19, 2014 9:52 pm

Re: RD350LC Carb choice

#6 Post by 75RD350rider » Thu Jun 29, 2023 10:04 pm

It is easily done. I bought 3MM ID brass tubing for the TM32s on my RD and drilled a hole slightly smaller than the OD of the tubing where I wanted the oil injected and drove them in with a little red loctite. If you want to get more fancy threaded barbed oil injection fittings are available as well.
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA

75RD350rider
Posts: 607
Joined: Thu Jun 19, 2014 9:52 pm

Re: RD350LC Carb choice

#7 Post by 75RD350rider » Thu Jun 29, 2023 10:07 pm

Here is my thread for the TM32 conversion
https://www.2strokeworld.net/forum/inde ... 0#msg24916
I love the smell of Blue Marble in the morning!
Tim Steele in Front Royal, VA

robakun
Posts: 43
Joined: Tue Jan 09, 2007 5:46 pm
Location: Torrance CA

Re: RD350LC Carb choice

#8 Post by robakun » Fri Jun 30, 2023 11:38 am

I use the Air cooled VM carbs which are 28mm vs the 26mm stock ones. they work pretty good with the Dale A mod
Official LC whore.

(F5)
Posts: 630
Joined: Mon Sep 27, 2010 7:21 pm
Location: Wellington New Zealand

Re: RD350LC Carb choice

#9 Post by (F5) » Sat Jul 08, 2023 5:53 am

Yeah my PWK had brass tube for oil injection. Pwk are in another league to mikuni flat slide and 2 leagues from round slide.
496 Cheetah. TSS PVs, PWK35s, Ignitech, RGV(ish) chassis

Bare
Posts: 1197
Joined: Sun Jan 29, 2006 2:18 am
Location: vancouver

Re: RD350LC Carb choice

#10 Post by Bare » Sat Aug 19, 2023 5:33 pm

As above; PWKs are FAR superior to Mikunis. No ifs ands or buts.
Jetting a PWK is Dead easy as even close works better than Perfect jettings on a Mikuni.
Kawa kx85 intended PWKs from a Kawa parts counter Were Far cheaper than any other source.
Likely not anymore though ?
As for oil feeds.... God gave us 1/8 drill bits :smt003 :-)

User avatar
Smoker
Posts: 4785
Joined: Sun Mar 23, 2008 8:08 pm

Re: RD350LC Carb choice

#11 Post by Smoker » Sat Aug 19, 2023 10:57 pm

The standard Keihin PWK 28 has two vent tubes, one for the left vent hole and one for the right. The KX100 Keihin PWK 28 has two vent tubes for the right vent hole and ZERO vent tubes on the left. The left vent hole is blocked.

Very easy to install oil injection fittings on PWK28s.

Bare
Posts: 1197
Joined: Sun Jan 29, 2006 2:18 am
Location: vancouver

Re: RD350LC Carb choice

#12 Post by Bare » Thu Aug 24, 2023 11:55 pm

One can even :-) fit oil injection points into the Carb Intake Rubbers OR the Reed valve rubbers.
Oil feed only needs to be in the intake air flow / stream.

thumper580
Posts: 89
Joined: Sun Jul 24, 2016 3:02 pm
Location: Virginia USA

Re: RD350LC Carb choice

#13 Post by thumper580 » Wed Sep 20, 2023 12:04 am

AZRD350LCGUY wrote: Wed Jun 28, 2023 6:24 pm I have been looking to replace the original crab on my 1982 RD350LC. It's bored to 375 cc otherwise stock. Would Banshee, RZ350, or are there better low cost carbs that would well?
Suggestions!
If you are in the US contact Ed Toomey in South Carolina. Ed Toomey Designs on Facebook. Great guy and he has a PWK28 complete setup for RZ350's. Pretty much bolt on and fly!!!
1985 RZ350
2000 Ducati 996S
WERA V2 National Champion

Post Reply