xj will not start after replacing air filter and float needl

i cleaned carbs set float levels and replaced float needles float needles were bad i had gas in my oil but now it wont start it will only start in choke position and do i screw butterflie screws all the way in and start from tfere or wat can some one plese tell me wat to do and in wat order

 

Well it is hard to tell from what you wrote ,but I will take a crack at it. First you have to make sure to clean the carbs perfectly. While you were in the carbs did you do a clunk test? Also did you bench sync the carbs. I would start there and when finished try it. If it still doesn't start we will go from there.

Also, welcome to the site.

 

Re: xj will not start after replacing air filter and float n

wat is cluck test? i cleaned carbs inside and out how do i bench sync? im new to all this

 

Read these:

carb cleaning
http://xjbikes.com/Forums/viewtopic/t=2 ... n+own.html

clunk test
http://xjbikes.com/Forums/viewtopic/t=1 ... clunk.html

Oh and make sure you've changed the oil if it had gas in it.

 

Re: xj will not start after replacing air filter and float n

im gona do the clunk test and recheck float levels and try syncing carbs because i had a friend mess with the sync screws

 

Re: xj will not start after replacing air filter and float n

[quotei had a friend mess with the sync screws[/quote]

There you go. :roll:

 

Do you mean it will start with choke on then runs ok after some warm up and runs ok with choke off?

Or starts ok with choke then will not run with choke off?

Or will start with choke on then runs ok after some warm up and runs ok with choke off BUT after stop for a short time will not restart unless choke on?

ab

 

Re: xj will not start after replacing air filter and float n

Firstly, you need to stop that leaking petcock. Do a search on that. IMHO the synching is all about smooth running and not easy starting. Get those float levels right, get new plugs and confirm fuel is getting to the plugs. We'll get to the smooth running bit later! Welcome aboard!

 

Well when you are cleaning out the fuel enrichment circuit. You might as well do clunk test and synch them while you are there. Do I need to get my DUH! sign out?

 

Rkjjdj, first- - Welcome.
Next, if you had a running bike before you cleaned your carbs, you would want to get back to that set-up first.
Some points of interest on your carb clean- -
Did you remove the 4 "O" rings and washers that are in the Pilot screw wells??
Did you find the "Beenie Screens" in the needle/seat area??
Did you clean the 4 jets in the float bowls??
How did you set your floats??

These are just some of the finer details of the carbs.

 

Re: xj will not start after replacing air filter and float n

i cleaned screens and i did not remove any o rings and i only seen two jets in the bowl

 

I just posted this in another thread and it completely applies here:

The carbs on these bikes are complex instruments that are very susceptible to getting gummed up from sitting and being clogged by rust particles from the fuel tank.

This isn't something that's going to be fixed by halfway "tinkering" it's got to be done right or it won't get fixed, you'll just keep fighting with it.

The carbs are going to have to come off; get broken down and carefully cleaned and any worn or deteriorated parts replaced. Then the float levels will need to be correctly adjusted using fuel and a clear metering tube.
The carbs will then need to be bench sync'ed; and once back on the bike, vacuum synced and their idle mixtures adjusted.

Then and only then will the bike run properly. Short cut the process and it won't work. You'll need a shop manual.

To that I'll add: everything you might have questions about has most likely been covered and probably argued over more than once in this forum. Use the search function, and look under "FAQ Suggestions" for some very helpful posts, with photos and everything.

 

Re: xj will not start after replacing air filter and float n

it will run with choke on at very high rpms and i turn choke off and it dies before i replaced float needles it would set and run bout 2000 rpms but couldnt get it any lower

 

It's possible that you just moved the "dirt" around inside the carbs, and you further plugged the pilot system, and you'll never get your idle back until you research and do a complete tear down.

You must remove your pilot screws, the 4 "O" rings and the 4 washers, then clean completely the Pilot passages.

You must clear the tiny jet in the BODY of the float bowl.
It will be an OMG experience when you find it.

The thin brass tube, run a wire thru it. That's where I found some crud.
There's also a tiny transfer port on that tube- - 4 of them.
Your new tool will be a single strand from a wire brush.

Welcome to at least the fifth circle of hell !!

 

Re: xj will not start after replacing air filter and float n

Did you remove these are any other jets?
If yes ARE YOU SURE YOU PUT THEM BACK WHERE THEY BELONG?

bikerbandit is an excellent resource PLUS they have LOTS of good stuff at a good price.

This is a link to their site with an exploded view of a 81 Seca 750.
http://www.bikebandit.com/houseofmotorc ... ca/o/m8225

You can access this info at SEVERAL outer sites, your favorite Yamaha shop for one.

Speaking of 750’s could you fill out your profile it will be very useful in the future as you get your ? up to speed.

ab

 

Re: xj will not start after replacing air filter and float n

i got some tip cleaners for a welder and more carb cleaner im going back in i found 2 jets on top and 2 on bottom i did clunk test and it was good i think it just needs a good deep cleaning i cant just half ass it wish me luck ill let yall know how it goes let me know if yall have any more suggestions please

 

Re: xj will not start after replacing air filter and float n

i had a stuck float i got in running will not having filters on effect idling ? i can get it to idle at 2000rpm but when i try to get it lower it cuts off