shark/brozz carb help

[tarote9025]

OK i joined awhile ago after purchasing a shark from alan tang per members suggestion. excellent referral very professional and fair. I was in NC and adjusted the carb to perfect nice amber color on the plug.

I then moved to dc for a few months and kept the bike in storage i recently moved to the Florida panhandle and have not been able to get it stable since. i bought a vm26 clone and its fouling the plug. bought 30 pilot and 110 main and its worse wont run for more than 10 seconds i know it is to rich does anyone have this bike in Florida that can tell me what pilot and main jets i should be using so i don't keep dumping money into it.

I would like to ride it before summer ends I've had it a year and it only has 200 miles on it because of me having to relocate out of state twice in 9 months. any help would be greatly appreciated. i really love this bike but work 2 jobs and live in a condo now without a garage so i cant really work on it but once every week or two plus humidity here is almost 100 percent all the time so its not as fun wrenching on it.

The bike is completely stock motor wise
and will be riden anywhere fron 25 to 200 feet above sea level daily once its fixed

[Weldangrind]

Have you dismantled the carb and cleaned it? I just cleaned two carbs yesterday that had goo in the pilot mixture screw passage. That prevented either machine from idling.

[tarote9025]

In the past month ive dismantled that carb about 12 times wiped it out sprayed it down changed jets everything just ordered a 25 pilot gotta wait til it gets here and see if that one works

[Weldangrind]

I can't imagine that your bike will idle on anything less than a 25 slow jet. I'd be inclined to also consider a 27.5.
The exhaust that you're running will impact jetting as well. Most of us have ditched the cat that's in the stock exhaust. Are you still running a cat?

[tarote9025]

Yeah i am everything on the bike is stock.
I had it running so good in nc i didnt want to mess with it. Also its only idling with the buttrfly on the carb opened up a little. I saw something about modifying the airbox but not really sure how to do it. Id appreciate any advice to get better performance and reliabilty out of the bike you might have. Your posts were actually a major help when deciding between the shark and a hawk of i remember correctly.

[Weldangrind]

I doubt that was me, but I'm happy to help however I can.
By butterfly, do you mean the choke? If it will only run with the choke mostly closed, it needs more fuel. Let's see what the 25 slow jet does and go from there. I recommend against modifying anything else right now; try to make only one change at a time.

[tarote9025]

Yeah i do mean the choke im an idiot when it comes to carberators honestly and ive been trying to get it to run with the choke all the way up but im guessing it should be the other way where the choke lever is all the way in its furthest down position i had the first one perfect in the up position so i was trying to replicate what worked for me before

[tarote9025]

ok so now it doesn't want to run at all.
i installed every combination of jets i have tried it with choke on/off installed new plugs and it just dies i usually work on the bike around noon but i did it early this morning to try and beat some of the heat. i dont know if the air weight is so different between the morning and afternoon here that it would cause it to run one hour and not the next but i cant get it to idle at all with what worked on it previously for at least 5 minutes. im really lost as to where to look at this point and about to sell it and get a klr. any advice on things to look at before throwing in the towel?

[JerryHawk250]

Have you checked the valves and adjusted them? Most of these bikes come with valves set with zero clearance. Tight valve will make it hard to start and tune.

[tarote9025]

i adjusted them when i first got the bike but it probably does need to be done again ive read anywhere from .02 to .04 clearance is optimal its been sitting for a year and only has 200 miles on it.

just spent 2 more hours playing with jets and a 20 pilot with 100 main gave me the best idle time still under 5 minutes and its not steady it keeps surging which is frustrating cause i go put up my tools and the bike dies then wont start without readjustment. luckily im off til wednesday so i have time to play with it.

[JerryHawk250]

Even with only 200 miles I would check them again. I know I had to adjust mine a few times in the first 500 miles.

[tarote9025]

just redid the valves at .004 for intake and .005 for exhaust and it sounds so much better not whining and pinging but still cant get a good idle the 20 pilot and 100 main lasted long enough for me to ride around the block in 2 gear and then died immediately after i let off the throttle switched to a 25 pilot and it wont idle for more than 5 seconds still having a problem with surging though not as bad

[Ariel Red Hunter]

Originally Posted by tarote9025

just redid the valves at .004 for intake and .005 for exhaust and it sounds so much better not whining and pinging but still cant get a good idle the 20 pilot and 100 main lasted long enough for me to ride around the block in 2 gear and then died immediately after i let off the throttle switched to a 25 pilot and it wont idle for more than 5 seconds still having a problem with surging though not as bad

Sounds like a vacuum leak to me. Take the o-rings to the hardware store to match them up and get new ones. Be careful about over-tightening the nuts both on the intake tube/engine interface, and the intake tube carb joint. Check the cap over the slide, and the rubber around where the throttle cable goes in the cap. If you are between sea level and 1000 feet, 25 to 27.5 pilot and 115 main with good exhaust system will work. Don't forget or mix up the two idle screws. The one on the bottom edge of the carb body is the idle mixture screw. The screw on the side of the carb is the idle speed screw. Binding throttle cable will also cause this trouble. Throttle valve (slide) HAS to shut instantly you release the twist grip...ARH

[tarote9025]

could be the throttle cable it feels different and it was super rusted when i took off the old carb. could i use regular oil or chain lube for it? Also, the 20 pilot jet with 100 main was 1.5 turns out on the mixture screw and needle clip in middle position thats honestly the best combo ive gotten for it to idle at. im worried 100 will not be enough for the higher gears and speed though. my plugs are covered with carbon the inside sleeve is completely black but one of them was only in the bike for 10 minutes. should i wait til i get it running to get new plugs or will plugs that black cause the idle to be off?

[Weldangrind]

Buy a cable luber and shoot a little carb cleaner through the cable housing to get rid of the rust. Follow that with whatever cable lube you like (I like Maxima Chain Wax on cables).
I'd focus on the 25 slow jet and 110 main jet as a starting point.