Back at it again

xadmp

O's and Boh's
Messages
62
Reaction score
0
Points
6
Location
Maryland
Hey all. Been having some issues with my bike lately that I thought I fixed myself but now I'm just at a brick wall. So I have had issues with my carbs in the past however I thought I became an expert at fixing these suckers. I took them apart and cleaned them earlier this year when I got her out and running and did all the normal maintenance needed. Didn't have any issues at the end of last riding season. Been "ok" so far this year until a few weeks ago. Bike runs however it starts on full choke revving way high (don't have tach) enough so that I have to go half choke and it calms down. Occasionally/most of the time I need to constantly give some throttle to keep the bike running. I have 145 main and 42.5 pilot and I'm 3 and 1/2 turns out on idle mixture screws. Running pods with open headers. Sparks are normal. Went out today started her up and it was idling fine for a while then I gave a little gas and it just died. Any ideas on why I'm having any of these issues? Thanks all!
 
I would think to go up on the pilot jet size to a 45. you could also raise or shim the needle height which should be done if you have to go to 4 turns out on the pilot screws then start back at 1 and 1/2 to 2 turns after raising or shimming. I would go by what your plugs are telling you for starters.
 
If you didn't have any issues at the end of last riding season with the same jet setup, its most probably not the jets. I'd guess vacuum leak as noted by Scorpio1963 and also check the carb diaphrams for holes.
 
had to look it up but will def check thurs for any leaks. can never go wrong with a ton of jets will keep you guys updated
 
is it ok to use the carb cleaner to check for the air leak? Will it rot the intake boots?
 
Checked for air leaks yesterday and found that the engine bogs on the left side. Ordered new manifold boots for cheap on eBay and will update you guys on whether it fixes the issue. Thanks for the help all! Plan on syncing the jets using the measuring stick post someone posted on here. Not sure if it will work without the vacuum on the petcock. Anyone have an idea how this works with vacuum petcocks and the two plugs on the boots?
 
Put your fuel tank on a bench next to the bike. Set the petcock on prime and run a hose to the carbs.
 
Finally had enough sunshine to get some things done to my bike. Replaced the air leak and she runs perfect. What a completely different bike already. Couldn't believe the smallest air leak causes such an issue but lessoned learned. Still have to figure out how to sync the carbs but it runs and sounds so good right now it can wait a few days. xschris said to run a hose to the carbs from my petcock (on prime) but still not sure how i can sync the carbs off of one carb if the other is hooked to the petcock...am i missing something?
 
I assumed that but I've never done it before and your last post got me confused. Will keep you guys updated. Thanks for the help
 
Synced my carbs today. Worked pretty well. Bikes running awesome for now. Very stoked on it all. Thanks for the help all.
 

Attachments

  • IMG_2791.jpg
    IMG_2791.jpg
    299.8 KB · Views: 235
So, stupid question: when syncing with a setup like you're using there, you're adjusting the idle control screws to get the fluid in each bottle at roughly the same level, is that right?
 
yea that was my first time doing it but it was fairly simple. I got the bike warm first. then hooked everything up and just let it run for a minute to settle itself. With this set up i didn't have any issues with anything sucking up so i could let it sit even if it sucked all the fluid out of one bottle. I just kept barely tweaking the screw in between each carb butterflies until it either was fairly even or was at a somewhat decent stand still. Im thinking I'm going to take the carbs off and just bench sync it one more time just bc I used to have to mess with the idle screw a ton so idk if i messed up my previous bench sync but theres a link somewhere on here i saw to do that. the system i used to today worked awesome and i barely had to mess with it too too much which was awesome. not used to how my bike sounds right now bc I've been riding it for a season and a half with an air leak that i just fixed. hope it helps!
 
This is the only screw you turn when syncing the carbs.
 

Attachments

  • DSC02575.jpg
    DSC02575.jpg
    234.7 KB · Views: 227
Agreed! DO NOT BENCH SYNC! Bench syncing is only visual and does not take into account the slight imperfections between the two carbs. The only way to ensure the carbs operate exactly the same is to test the vacuum pressure (i.e. carb syncing with the bottles).
 
Back
Top