start up problem. help needed

hey folks

i pulled the carbs and cleaned them. they were dirty!!!
put everything back together. set petcock to
prime to fill up bowls. when i try to start gas comes out from the hose thats attached to bottom left of the air box ( bottom left when sitting on bike)

what did i mess up?

on a side note, i have fouled spark plugs but cant find ones bp only bpr and the bpr dont fit into my ngk caps.

 

ok so i noticed when the bike is in park and i turn the petcock to prime then the gas flows from the airbox hose.

does this mean i messed up my floats while i was cleaning the carbs? if so what should. specifically check for when i pull them out.

also is this the reason why my bike is not starting?

 

one more update.... when the petcock is on position it still flows gas from the air box filter and bike will not start

 

There are float needles in the bowls which are rubber tipped things... they are driven up by the floats into a brass (bronze, I am not sure) seat as the fuel flows in... they are either bad or you put them back in incorrectly.

 

ok i pulled the carbs back
out and all four floats were upside down! hey what can i say its my first time.
lets hope it start now.

my plugs were very wet from seafoam because i sprayed seafoam direct into carbs and ran the engine until it stopped. should i change the plugs?

 

Yes new plugs, but only after you put the carbs back on to ensure you won't again flood the cylinders -- and you may have contaminated the oil

 

Go slowly, methodically -- look at and check all things twice

 

ok carbs are back on and there is no gas leaking. the bike turns over and not starting and back fires. so meanings sparkplus are not sparking?

next is to chang plugs and oil?

 

backfire is bad plugs -- yes good job

 

lol ok guys here is new update

1. i cannot find bp7es plugs anywhere local and they cannot even find it in thr system to order it. i tried the bpr7es but the dont fit in my spark plug caps. i have the ones that say ngk 5k

2. while pull off one of my caps the wire broke off. can this be repaired or a new wire

 

http://www.amazon.com/gp/product/B004SK ... 02_s00_i00

new wires will be the smart way to go...

 

ok not sure if i am making a fool of myself here. i am new and just learning this

is the spark cable supposed to come apart? because i checked the rest and its same. so its not broken? i wish i can upload a picture with iphone to show u folks

 

No dumb questions -- but answers have no guarantee

Having siad that:

Spark cables coming apart will significantly inhibit or encumber ignition of fuel in the cylinder

I believe if they are OEM and have never been changed, and if where they "come apart" is showing bared or frayed core conductor wire, you've got a problem.

 

ok so
what is a way i can test the spark on the plug
and
what us a way i can test spark coming from the cap.
this will clear everything up

 

Look in the plug cap where the wire should be located, you will see a prong with a scewed thread on it.
These spark plug caps are a "screw on" type.
If you have pulled a cap off, just trim off a small amount (1/8"), & screw it back on till it's tight.
You might want to do this to all 4.
To check spark, install a spark plug in the cap, & rest it on the head. Crank the bike & you should see a spark at the electrode of the spark plug.

Good luck,

Tim.

 

ok i am not sure if i understood this. you want me to trim off the rubber around the wire? you mean kind if like stripping off speaker wire to expose it? and then with more of the the new wire exposed push it back in to the boot?

 

and if i were to buy new wires and caps where do i find them?
i did a search on ebay for 1981 xj750 spark plug wires and nothing came up

 

No. Just cut the end of the wire clean across. Then thread the plug cap back onto the wire. DO NOT strip the plug wire.

What has happend is that the threaded prong in the cap has lost its bite on the plug wire. Cutting the wire will give it fresh material to bite into again.

You will need to cut approx 1/4" to 3/8" to get past the point of the old bite position. Doing it on all 4 is highly advisavble/

Ghost

 

so i am cutting off including the exterior insulation? essentially shortening the spark plug wire. not just the live wire inside insulation.

 

The supporting vendor here Chacal has all that stuff...

 

That is correct.

Ghost

 

ok so here is my next update guys .. i will go back and recap
1. bike was running
2. i sprayed seafoam direct into fuel line and ran bike until it stalls
3. took out carbs and cleaned them
4. put fresh gas in
5. plugs were fouled changed them from bp7es to bpr7es
and confirmed spark in all plugs. be it a small spark not sure how strong these spark should be?
6. noticed gas pissing out of my air box drain. pulled carbs back out i noticed i put the floats upside down. fixed that and the pissing gas stopped
7. i clipped the spark cables 1/8" like u guys said confirmed spark the same small weak spark
8. try to start the bike. nothing! pulled plugs and they are dry and new. no gas is getting in there. i cannot check bowls because the drain screws are stripped.
9. i confirmed gas coming out of thr petcock in prime

so i am guessing i messed up the carbs putting it together and this time no fuel is getting in? why else would the plugs be dry?

what should be my next step?

 

You have no choice but to pull your carbs and recheck every thing.

 

ok but what could be the culprit here? what would make no gas go
in the cylinder?

 

Float level too low... pilot passages blocked... inadequate air flow from air box... enrichment circuit not working.