Are there any special mods I would need to do other than bolt it up?

Is it the same size as the 32/36 as far as fitment and (chrome)air cleaner clearance?

TIA,
Mike
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74-02...Polaris/Navy Sweet car

Excuse me, but carbs that "run kinda cruddy" are usually dirty, worn or maladjusted. The nature of your question leads me to jump to the conclusion that your present carburetor is not properly set up or some of the other common components are not adjusted properly.

The answers to ALL of your questions, including the ones you did not think to ask, are answered in the archives and various FAQ articles found on linked cites.

An M10 engine equipped with a 32/36 can be made to run quite acceptably for most folks. This is not to say that the 38/38 carb is worse or not a performance upgrade, but since you do not even know the difference between the two carbs you sound to me like you are just chasing your tail. If you cannot get your engine to perform even fairly well on the 32/36, you may be in for more of the same with a different carb. Search the archives, discover the advantages of both carbs.

flynbimmer wrote:

Are there any special mods I would need to do other than bolt it up? Is it the same size as the 32/36 as far as fitment and (chrome)air cleaner clearance? TIA, Mike

no mods needed...it's a plug-n-play swap
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i would recommend spending the small amount to get the carb tuned and jetted properly

drove w/ the same carb for 3 years and it was great for a daily... enough to have fun with and easy on the gas when you drive normally
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1969 2002 Automatic w/ Sunroof "pumpkin"
1974 2002tii #2782677 (being assembled)

excuse me but the 38/38 WEBER requires larger,
accurately machined mounting throat holes in the manifold
to work properly. It aint plug-n-play easysimple.

As the above state, get what you got optimized and repaired
correctly before you venture down another blind alley.
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1976 BMW 2002 #2743711(sorry I sold it 12/25/06)
1986 BMW R65 650cc twin 19k miles
1964 BMW R27 250cc single 15K miles
2002 BMW 325xiTouring 29k miles
1984 MERCEDES-BENZ W123 300D Turbodiesel-188k miles fein-DIESEL

Before ya go out and spend $$. Go to your local Auto store. Get some Carb. Cleaner,Gasket Roll,Razor blade. Take the Carb. off. Spray the Piss out of it.
2/3 cans. and what ever else that is dirty/nasty in the bay. Trace the bottom of the Carb.For a templet.or what I did, little bit of oil around the bottom of the carb. Placed that on the corner of my Gasket roll.Then Razor blade Your new Gasket. Razor blade manifold,and Carb. Clean all. Gray gasket sealer. Replace in Car.. Spent $10

But if ya got Money to burn. Have at it.


Last edited by rc02 on 7-19-08 07:33; edited 1 time in total

c.d.iesel wrote:

excuse me but the 38/38 WEBER requires larger, accurately machined mounting throat holes in the manifold to work properly. It aint plug-n-play easysimple.

i disagree...i have run 38/38's on intakes that were not hog'd and enjoyed the benefits of the 38....the difference, in my opinion between a stock manifold and one that's been hog'd is negligible...

at any rate....the 38 is without doubt a plug-n-play swap and will out perform a 32/36 regardless of intake mods

sometimes, some of us may rather buy a new carb than futz with the old one...it's possible that not all of us have the know how to rebuild a worn out carb and we don't have anyone that we can take it to that will reliably get the job done

take it to some unknown mechanic, spend $300 to have him spray some carb cleaner and replace a few gaskets and you coulda come very close to buying a new weber 38 without the aggravation and down time
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Thanks to all who replied....

I am rather new to the site....So, please forgive me for not heading directly to the archives.....I thought some chiming in would be nice....

All for the information is valuable to me, and appreciated.

Mike
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74-02...Polaris/Navy Sweet car