Author Topic: Weber carb set-up (Read 151874 times)

johno · « **Reply #475 on:** April 11, 2014, 02:02:55 AM »

Just bumpin up the thread for Medyos

Medyo Bastos · « **Reply #476 on:** April 19, 2014, 05:01:17 PM »

ty johno

slikwilli420 · « **Reply #477 on:** May 14, 2014, 07:09:20 PM »

Manifold is complete and the carbs are mounted! There is still a laundry list of items before the bike is ready to breathe through them but progress is being made. They are a tight fit to be sure, but will be one of the most distinctive parts of my project.

johno · « **Reply #478 on:** May 15, 2014, 01:38:51 AM »

Lovely work Slikwilly, Scottly will be loving it.

seriously that is nice machining and fitting, you have done good things on the frame, its shaping up to be a very nice project bike mate.

Tintop · « **Reply #479 on:** May 15, 2014, 04:10:19 AM »

+1 very nice work.

Are the lever arms & links from Pierce??

Make sure you have a support for the carbs (from top usually on 750's). Otherwise they will droop significantly on the rubber boots.

slikwilli420 · « **Reply #480 on:** May 15, 2014, 06:53:18 AM »

Tintop, the whole linkage kit is from Pierce. I used them based on your recommendation and they are stellar. Im replacing the shaft collars and rod ends with stainless units but the levers and all else are staying. I put the carbs super close together so they would like up better with the ports in the head. Im really hot on water-jetting all kinds of stuff right now, and will probably design a plate the hold the carbs from the top attaching to a lug welded into the backbone. The plate will also have a provision welded on that will serve as the mount point for the throttle cable adjustment screw/nut. My build with all the other water-jetted goodies is in the project forum.

Tintop · « **Reply #481 on:** May 15, 2014, 01:02:48 PM »

Just read through your build thread, some very nice things going on.

Love those AP calipers. I'm really into the water-jet thing as well. Check out my 550 build, and vintage sidecar (links in my signature). What CAD program are you using??

With your oil cooler your going to want to keep vibration away to prevent cracks, so you'll want to 'soft' mount it.

slikwilli420 · « **Reply #482 on:** May 15, 2014, 01:54:33 PM »

Im using Proge2009. Its a free version but my water-jet guy can convert to DXF and run whatever I need. I will definitely be doing some type of soft/rubber mount for the cooler.

Tintop · « **Reply #483 on:** May 15, 2014, 07:09:20 PM »

slikwilli420, so this Weber thread doesn't get high-jacked I'll post comments to your build thread.

Tintop · « **Reply #484 on:** July 01, 2014, 03:26:12 PM »

OK looking for some suggestions from the Weber guru's. I need to add some fuel at the top end because with the new head & cam the old jetting has leaned out quite a bit. Don't want to add much, and idle is good. Current jetting is as follows:
Mains - 135
Airs - 175
Tube - F11
Pump - 135
Discharge - 50
Idles - F950

I have the following to work with: Airs from 175 to 190 / Mains from 135 to 145 / F9 & F16 tubes / 140 pump jet.

Figure the equivalent to what I currently have would be - 140 mains & 190 airs, so looking at 140's with 185 airs as a start. Comments??

scottly · « **Reply #485 on:** July 01, 2014, 06:24:27 PM »

Sounds like a good place to start.

Tintop · « **Reply #486 on:** July 01, 2014, 07:06:04 PM »

That's my feeling scottly. Been going through my books but haven't found the part I'm looking for - tube comparison. I know the F16 & F9 bracket the F11 eg. one is leaner on top & the other is richer. I'm going to keep looking, but do you happen to know? That would be my next change if the jet change gets me close.

scottly · « **Reply #487 on:** July 01, 2014, 07:25:22 PM »

I think the air has more effect solely at the high end than the emulsion tubes?

Tintop · « **Reply #488 on:** July 02, 2014, 02:31:06 PM »

Quote from: scottly on July 01, 2014, 07:25:22 PM

I think the air has more effect solely at the high end than the emulsion tubes?

That's my feeling scottly. Was checking through my notes, and I did try 185 / 140 / F11 before, but it was to rich, and was with a 50 pump jet (now a 35). However, with the better flowing head, and cam might be the sweet spot now.

Did find the info I was looking for on the tubes. I need to do some measuring, and check hole placement, but sounds like the F16 would be the one to fine tune top end fuel delivery.

BPellerine · « **Reply #489 on:** October 01, 2014, 05:15:54 PM »

bump for bill benton

jaguar · « **Reply #490 on:** October 01, 2014, 07:27:06 PM »

Bill going to swap to webers?

BPellerine · « **Reply #491 on:** October 02, 2014, 12:24:51 PM »

going to get them running to try them,bill

jonnycakes · « **Reply #492 on:** March 17, 2015, 03:42:43 PM »

I bought the weber/rc off the sales section and am running it on a stock CB750A..... They have a 32mm choke. Is 32 way too big to start with?

BPellerine · « **Reply #493 on:** March 17, 2015, 05:29:24 PM »

most are running 30s and I run 29s,but I think you have a bigger engine ,you should list your current jetting and go from there.bill

jonnycakes · « **Reply #494 on:** March 17, 2015, 06:37:46 PM »

32mm chokes
4.5 Aux Venturi
F16 Emulsion Tube
125 main
45F8 Idle jet
60F5 starter jet
35 pump jet
Pump Spill 55 (what is stamped)
.200 needle valve
150 AIR CORRECTOR JET

scottly · « **Reply #495 on:** March 17, 2015, 07:48:35 PM »

My feeling is that 28mm chokes would be a better fit for a stock auto, but since you have the 32's you might as well give them a shot.

You may have to go up on the main jet to compensate for the over sized chokes..

Bill/BentON Racing · « **Reply #496 on:** March 18, 2015, 05:28:27 AM »

Mine will be on a 915-1080 bore. 327 cam, Mike Rick Stage III or IV.

All input welcome, Bill

jonnycakes · « **Reply #497 on:** March 18, 2015, 06:57:46 AM »

I can get 28 or 30s on eBay for $50. It's really hard to start.

BPellerine · « **Reply #498 on:** March 18, 2015, 10:30:24 AM »

any idea what size engine your carbs came off?my bike is stock right now and running an ard that I got from you,2 pumps on throttle and kick until it tries to fire and another one then kick and it usually fires up ,have to warm up before good idle.my mains are 115 and my airs are 200,pumps 35,make sure that your pump jets are working as that is what you are using to prime the engine,having extra chokes on hand is not a bad idea as they can be changed in a minute.I might be wrong but I think of the chokes as changing the size of your carbs say from 32 to 28s etc.ie if your pumps are not working bike will be hard to start ask me how I know!bill

jonnycakes · « **Reply #499 on:** March 18, 2015, 11:21:50 AM »

no idea what size bike.....I'm thinking I might go with 28s or 30s to work better with the low range needs of the matic

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Author Topic: Weber carb set-up (Read 151874 times)