Author Topic: luders new 750 project (Read 28040 times)

luder · « **Reply #175 on:** July 18, 2009, 11:50:45 AM »

Another month gone by I better start working on this again. Started out quick but now we are slacking. I am putting the carbs back on this afternoon, just seems like I am getting to much fuel. I have the air screws out 2 turns and never touched anything else but cleaning (3 times) so she seems real clean. Had her running decent after we static timed her, put a timing light to her and now I am at the end of the plate adjustment(marks do line up), any ideas. The big mda ride was today should of took the harley but I have a few issues with that as well, and I want to get this cb on the road and see what I have, keep you posted...luder

luder · « **Reply #176 on:** January 31, 2010, 11:20:45 AM »

Wow 6 months without working on this thing (Now I know I have ADD) I still come to the forums often and check up on you guys and gals. I think its time to uncover the girl and continue on. As an update I never got her running good and never got to ride her. I started out hell bent but I petered out. So with my reintroduction to the build, I will keep you all posted on the progress, and of course all my newbie questions......later luder

fastbroshi · « **Reply #177 on:** January 31, 2010, 04:32:15 PM »

Alright, you're back at it again. You were so close before. I read through this and no one mentioned checking the float levels - you did that, right? Sounds like you got good spark. How's the air filter? Did you check the valve clearances? The last two things won't alter the whole running rich thing, but I'd do it just to make sure.
Oh and what oil did you put in? jk

Inkscars · « **Reply #178 on:** February 01, 2010, 11:26:40 AM »

Luder!
Why'd you give up?! Maybe it's because I didn't etch a mirror for you?

luder · « **Reply #179 on:** March 10, 2010, 09:12:06 AM »

Well we finally uncovered the bike again after a year, now I will have forgotten things that I tried to learn last year. I put the tank back on and tried to fire her up. She ran on # 3 and 4. Pulled the 1 and 2 plugs blasted them and check for spark-ok there. Put them back in and they immediately fouled again-fuel even coming out of the exhaust (as that is why the rag is on the floor) I will be reading again and see if I can find something I missed. Still been reading the boards as this is a great forum. So we will continue on at a slower pace than last year and the quest to get her on the road this year is important.......later luder

hoodellyhoo · « **Reply #180 on:** March 10, 2010, 04:23:44 PM »

Now that the weather's nice we should get all the wisconsin members together at your place and figure your bike out! Glad to see that you are sticking with it.

Little_Horse · « **Reply #181 on:** March 10, 2010, 04:27:09 PM »

sounds like a float needle problem. The needles are not seating allowing too much fuel into the bowl creating an ultra rich condition and considering the fuel leaving the tail pipe. So a simple cleaning in there should take care of it. Make sure the needles are free and that there isn't gunk in its passageways to keep it blocked open.

Inkscars · « **Reply #182 on:** March 10, 2010, 08:05:46 PM »

Luder, don't expect to set them and forget them. That's just not the way they work.
On the brighter side, you got interested again, and that counts for something.

maybe we can exchange some liquid inspiration again sometime?

luder · « **Reply #183 on:** March 11, 2010, 07:14:39 AM »

Corn-there new float needles as I had 1 carb overflowing- will setting them wrong let to much gas in before they shut close? Hood-gotcha Wisconsin members at the shop (beer and brats) now that would be interesting. Talk to Johnie about this problem last year-He is up by you I believe-Oshkosh. And Ink I could probably come up with something for you and yes we will get her on the road this year. Sometimes I think why not just get rid of the shovel and the cb, Then just get a newer cruiser and get rid of the problems but not yet. I will pull the carbs today and take pics of a few things and ask you all a few questions, thanks luder

Little_Horse · « **Reply #184 on:** March 11, 2010, 07:21:39 AM »

well they can get stuck if they sit for too long even if the needle is new. (Too long can vary but usually problems start within a month or two). And yes to answer your question if you inadvertently changed the setting on the float so more fuel enters the bowl it would cause the same issue. Float/fuel height is super critical in that you really don't want it to be to much. I am not sure about your specific carbs but in the manual it should specify float/fuel height and what procedure to adjust them. I only didn't mention that before because it sounded like you had it working right before.

luder · « **Reply #185 on:** March 11, 2010, 08:37:00 AM »

Ok t

here off again-this needle I set 1 turn out

luder · « **Reply #186 on:** March 11, 2010, 08:39:50 AM »

14.5 mm

luder · « **Reply #187 on:** March 11, 2010, 08:41:34 AM »

14.5

luder · « **Reply #188 on:** March 11, 2010, 08:45:15 AM »

I will read some info and see if I can find a solution, What angle are the carbs sitting when you measure them ,upside down and even......thanks luder

Little_Horse · « **Reply #189 on:** March 11, 2010, 09:07:20 AM »

well the little needle has a very tiny spring in it. You need to set the height when the spring is fully out but the float is still making contact with needle assembly. So usually I have the carbs more sideways with a slight angle to get the float to rest ever so slightly on the needle. Then take the measurement and adjust if needed. I would pull all the needles and clean in its passageways since you already have it apart.

traveler · « **Reply #190 on:** March 11, 2010, 09:07:32 AM »

Stagnant fuel can definitely cause problems....that is why before I started by cafe build, I added a full bottle of carb cleaner to the tank with a bit of fresh 91 octane fuel.....with 1 gallon of fuel and a full bottle of carb cleaner in the tank, I started and rank this "mix" through the carbs, and then turned it off and let it sit like that. After a week, I started the bike back up and burned out all the crap gas, and then turned it off with my clean mix sitting in there, keeping things nice and clean. Any grime/sludge in the carbs is now gone.

My suggestion, is that you do the same, and let her sit for a awhile and once every week or so, start her up and burn out the crap.....after 1-2 times, you will have some clean carbs on the inside! It's also a good idea to add some Sta-Bil, as it staves off gas degeneration, which coincidentally starts as soon as the gas hits your tank.

Anyhow, just my .02

~Joe

luder · « **Reply #191 on:** March 16, 2010, 02:27:58 PM »

Had a chance to play with the bike yesterday, cleaned carbs again, set floats so she would shut of fuel sooner, cleaned the plugs,soaked the boos so I could soften them up again,reinstalled carbs,fired her up and quess what fouled out 1 and 2 again. This is frustrating to say the least. Well maybe its ignition,wires, something out of the box, I ll keep you posted. 60 in Wisconsin and the bikes are out................later luder

fastbroshi · « **Reply #192 on:** March 16, 2010, 03:23:23 PM »

Luder I think Corndp pointed it out. I think you're measuring your floats incorrectly. I'm not sure about what model carbs you have, but the measurement should be taken from the base of the carb to the top of the float as the brass bracket is just making contact with the needle.

The way you're measuring in the pic, it looks like they are resting on the needle. So the needle is full open in other words.

luder · « **Reply #193 on:** March 31, 2010, 11:19:55 AM »

Since my last post I took my carbs off and set the floats wrong on purpose to shut the needles early. Started her up and still rich and fouling a plug or to and rough running. In fact it seemed to be starving and when I would give her throttle it would hesitate then catch on, so I think I was giving her a boost with the accelerator pump (because when I took the carbs off again they were almost dry. So here I sit again with the carbs off 70 degrees in Wisconsin and my thumb up my a$% wondering whats wrong here. Idle screws 1 1/2 turn out, stock clean filter,ready to buy some new plugs and go at her again. Any thoughts would be appreciated. If I new how to video this thing I would post the rough running if at all girl.....Keep you all posted,,luder

Little_Horse · « **Reply #194 on:** March 31, 2010, 01:24:51 PM »

well put the float height back to the correct height, blow air through every opening big and small, check to make sure the jets are the right size and in the right place. Once on the bike make sure all the boots are sealing correct at the intake. Keep at it, don't get too frustrated you will figure it out.

fastbroshi · « **Reply #195 on:** March 31, 2010, 01:40:23 PM »

You have carbs with accelerator pumps? Maybe that's the issue. Don't they have those rubber diaphragms that are prone to damage? Just a thought, don't know much about them.

luder · « **Reply #196 on:** March 31, 2010, 02:49:35 PM »

new accelerator pump

Little_Horse · « **Reply #197 on:** March 31, 2010, 04:26:38 PM »

do you know what looks wrong to me is your main jet holder looks too long, like it is from a latter model 750 the ones that use a vacuum slide. I can't tell you for sure here, as I have never been in 750 carbs like those, they are the same carb body as my 500 though and I can tell you that part does not look at all like mine, but like I said before looks like my dads 81 750 jet holder. I don't know how you would go about verifying maybe someone else can chime in, what year 750 again?

luder · « **Reply #198 on:** April 08, 2010, 01:33:19 PM »

Ok 1 more time, reset the floats, cleaned again, readjusted my valves (Im bad I believe that was one of the bigger probl<a href="http://s445.photobucket.com/albums/qq173/deltonab/?action=view&current=oil004-1.jpg" target="_blank"><img src="http://i445.photobucket.com/albums/qq173/deltonab/oil004-1.jpg" border="0" alt="Photobucket">[/url]ems) A new set of plugs and I can now get her to at least idle when warmed up. The airbox is not on yet as I may take the carbs off again-this was yesterday job on her.......

luder · « **Reply #199 on:** April 08, 2010, 01:36:28 PM »

Sorry about that. This pic show a hose that I do not believe gets hooked up to anything-am I wrong? The fitting in front of the screwdriver goes to my petcock-OK?

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Author Topic: luders new 750 project (Read 28040 times)

traveler