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Carb Rebuild Follies - Newbies take heed

livinginthepast

Jedi Trainee
Offline
Well, it doesn't run any worse than it did before, so there's that!

My first SU rebuild experience.

Rebuilt the bugeye's H1s last night and learned some valuable lessons (not in this order):

1. Rebuilding your SUs is extraordinarily easy - unless you are working in a cluttered area. Drop a spring, add 30 minutes. Drop a brass washer, may as well use the old one. The lesson - work in an uncluttered area.

2. Be careful to push your float bowl out of the way of the front throttle linkage/spring assembly when you reinstall. If not, you may scratch your head for a while trying to figure out why returning to an even idle is inconsistent.

3. Prime the float chambers before trying to start for the first time after reinstalling.

4. If it's after 11pm and you're getting pi**ed off cuz nothing is going back together as you remember it, stop and wait until the next day. I did in 20 minutes on Saturday morning what I struggled over an hour with Friday at around 11:30pm.

5. Those little black donut shaped things in the jet assembly taht look like hard rubber washers were actually cork washers once. After scratching my head for while, I finally figured out this fact.

Now to figure out how to tune the carbs.
 
AMEN Brother. Same thing with a clutch slave cylinder one night. I had my son AND my wife out there with me. Loads of fun!
 
Yes, good suggestions.

Ever see a watchmaker working? He'll have a soft pad covering the work area--that prevents little parts from bouncing if they're dropped. Good idea to work over a soft cloth when you're doing something like rebuilding a carb or anything else where there are a lot of tiny parts.

Also helps to have a book showing how it all goes together. The Brooklands book, "SU Carburetters Tuning Tips and Techniques" is pretty good and covers a lot of types. You can find it pretty often on ebay.
 
Good advice all - now to follow it - ah well, next time I will I promise!

was listening to Car Talk on NPR on saturday and they made the point that if you take apart and rebuild your carb enough times, eventually you end up with two complete carbs.

they weren't sure how many times though -
 
And I expect they are correct, lol.
 
That's funny. When I picked up my midget it came with a box that contains three other carbs and the PO did say he rebuilt the one currently installed, I wonder how many times to get 3 extra, lol
 
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