High Performance Dellorto carb found!

Oooohh.. VERY good question.

Didnt even think to pull the float bowl and look.

***Goes to pull carb apart***

The main jet that came with this one is a 70. What did your generic come with?

I'll need to get an assortment of jets to try once I get the tuned pipe on my bike. Tuning will be an adventure in and of itself.

70 I think as well. I will confirm tomorrow.

I ordered a 60,65, 75 and 80. Just for fun, when I ordered the air cleaner and stuff. I was tempted to get the $15 tuning manual but didn't pull the trigger.

Are you 100% sure the screw on yours is for mixture? Mine is only slider height.

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Not 100% sure on the screw. I will pull it out of the carb and look at the end of it and the internals of the carb it interfaces with to figure out what it does.

This flat-slide carb type is a newer technology.. The 2 stroke tuning guide I bought off Amazon which was written in the 90s doesnt even cover it in the carburation section of the book.

The tuning manual from dellortodirect, I found is ONLY for the cylindrical slide carbs Dellorto makes.. It does not cover the flat slide carb at all.

tonight, I'll see if I can find a tuning guide that covers the specifics of flat slide carbs. There's got to be a book out there somewhere on them.

SHA Carburetor Parts [SHA Parts] - $0.00 : Dellorto Carburetors, And parts for you.

In that parts breakdown, they label that particular screw (#41) as "Mixture Screw". The spring (#40) is labelled "Mixture screw spring"

I'll take mine apart and see what it is exactly. Pretty easy to tell if its a metering screw (ie mixture) due to the sharp point and fine machining on them.

One other really cool thing about these carbs over the stock HT carb, is that these carbs have a built-in fuel filter (item #15 in the pic above), so theres really no need for an additional filter.

For what it is worth, I ended up with a 85 jet in my 18mm Mikuni, on my 48cc. I was wondering the same thing on the screw Datz, it is listed on their site as " mixture screw" but if it were the air screw then it looks like the only idle adjustment would be thru the cable. #43 is also listed as a "mixture screw". The flat side carbs on motorcycles I have had provide for a "sharper" throttle response. I dont believe there would be much difference between tuning a round slide versus a flat slide...

Took a closer look at my SHA carb and yes, that screw DOES run the plate up and down, thus would just be an idle adjustment screw. Definitely mis-labeled on the Dellorto site. My fault for not checking it before answering a few pages back. I'll go back and edit my prior posts to correct the info.

Ok.. I'll take a good look at the tuning guide Dellorto sent me and see what info it provides. Might be a few useful tables I can scan in and post up if anyone is interested.

In the tuning guide, there is some useful information on proper choke selection. The SHA carb, you can change out the choke to match the engine's choke requirements. There is a nice table, but is more oriented to higher hp output engines.

I'll scan it in and post it up.

Here's the tuning guide. Managed to get it into a PDF format. It is about 10 megs. Has some good info on tuning tapered-needle carbs like the stock on the HT motors:

Right click and "Save As" for viewing locally
Dellorto Manual

If the admins have any problems with me posting this info up, please delete this post.

Found a link to a ton of Dellorto manuals and parts diagrams if this helps anyone:
Greg Bender - Dell'Orto carburetors

Good stuff - do SHA carbs even have needles?

Looks like to me, the way to change midrange is the second jet, I think it comes out as one piece with the two atomizer holes

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