Topic: 74 750k carb question

[excerpt]

Is there any way to change the needle clip position without having the re-sync the carbs?

I'm trying to tune my carbs with pod filters.

I wanted to put the factory airbox back on and rejet to factory specs, but it seems my friend threw the airbox and filter in the trash. I really don't want to spend close to $100 on a new box and filter (just to get a benchmark).

ugh. plugs are sooty, and I've changed the main and pilot jet a few times, but it doesn't seem to have an effect at all.

I have the airscrews turned in all the way. If I back them out, the bike bogs down a lot.
The choke seems to have very little effect.

suggestions?
anyone have an airbox and filter you want to sell for cheap?

I think this afternoon I'm going to install 105 main and 40 pilot jets. That's the stock setup for this bike.

I've tried running open pipes, and I have a muffler. It seems to have little to no effect as well. I'm almost to the point of saying backpressure is a myth.

Pretty sure I fouled plug #3, and #4 seems like it's about to go. Started it up last night, and ran it for about a minute. Sounded like a tractor and had to give it throttle the whole time. Turned it off and #3 pipe was room temp. #4 was slightly warm (I could hold it). #1 and #2 were hot.

I know this is a little scatterbrained. sorry. lol

[excerpt]

Anyone with some advice after reading this frustration filled half rant half question?

I'm pretty sure I set the needle clip one position up from center (by "up" I mean towards the "non-pointy" end)

[yozuri54]

Before messing with the carbs anymore, I suggest the following first:

1. Adjust the valves (.002" intake / .003" exhaust) and cam chain per Honda manual.
2. Adjust/clean points and static set timing (you can strobe later once it's running OK).
3. Remove plugs and do a compression check - the readings should be 120-150 and not vary much between the cylinders.
4. Has the oil/filter been changed recently? (using 4 cycle bike oil - not car oil!)
5. Clean and check/adjust gap on plugs - make sure they are the corrrect type for your bike.
6. Once these tasks have been performed and all checks out, you may indeed have a carb problem. I had one set of 750 carbs where the previous owner decided to drill out the pilot jets (they were marked#40 but were probably about 80 after he was finished!) Very sooty plugs on that one. Of course there are about a  dozen more carb or electrical issues that could be the culprit.
Let us know what happens......

[octagon]

i've got a couple of airboxes - one pretty good, and one scratched up - just pm me if you're interested

[octagon]

here are a couple of pictures of the beat up airbox - it's missing the top brackets - you can have it for shipping.

[Rigid]

Bench synch is fine until you get things closer to being sorted out with your jets.  Moving the needle is more effective, within the range of the jets ability to flow a given amount of fuel, than just changing jets up and down. I leave the pilot jets alone on mine and work with the mains in the range of 110-130 depending on the intake or exhaust situation.