open circut secondary ,high primary coil

[dirtydownunder]

hey!,

i was tuning the bike and could not shake this hestitation at high gear, low speed, wot and mid rpm (before it gets on the pipe) it felt like ignition but i thought i was there and should try jetting anyway. so i went from 155main and all the clip position to 158 and 152 mains.

the bike takes off awesome if you go 1,2,3,4,5,6 and is great when your on the pipe but say you cruising and hit some boggy sand and go wot (high engine load situation) it sorta misses and hesitates (doesnt backfire or pop), enough for me to get off the throttle asap.

 

tests came back

coil primary .5 - .9 (.28 - .38) factory ohms

coil secondary O/C- O/C ( 4,700 - 7100) factory ohms

 

coil plug 5.19 ohms

coil plug and lead 5.22 ohms

 

pickup coil 117 (94-140) factory ohms

pickup gap .19 thou

 

charging coil 18 (13.7 - 20.5) factory ohms

 

spark plug gap .6mm

 

 

so it appears to be the coil, and whats worse is that it was wired up backwards from the dealership !! that may have caused its short life, it also sucks that im trying to tune a new setup with this happening.

 

i did a plug chop to see what its burning like but when i took off 1,2,3,4 i had to stop so i pulled clutch/shut off and did it again (on the same new plugs). ( due to loose dirt it did not take long to get though the gears so not much engine load)

 

chop was done on 155mains clip in middle position on oko 30s avgas/94 mix

 

 

what is a good coil to get ?? and does 141/141psi comp on 20 cc domes, ASL with dune/play port sound normal ?

 

thanx guys.

[blowit]

hey!,

i was tuning the bike and could not shake this hestitation at high gear, low speed, wot and mid rpm (before it gets on the pipe) it felt like ignition but i thought i was there and should try jetting anyway. so i went from 155main and all the clip position to 158 and 152 mains.

the bike takes off awesome if you go 1,2,3,4,5,6 and is great when your on the pipe but say you cruising and hit some boggy sand and go wot (high engine load situation) it sorta misses and hesitates (doesnt backfire or pop), enough for me to get off the throttle asap.

 

tests came back

coil primary .5 - .9 (.28 - .38) factory ohms

coil secondary O/C- O/C ( 4,700 - 7100) factory ohms

 

coil plug 5.19 ohms

coil plug and lead 5.22 ohms

 

pickup coil 117 (94-140) factory ohms

pickup gap .19 thou

 

charging coil 18 (13.7 - 20.5) factory ohms

 

spark plug gap .6mm

 

 

so it appears to be the coil, and whats worse is that it was wired up backwards from the dealership !! that may have caused its short life, it also sucks that im trying to tune a new setup with this happening.

 

i did a plug chop to see what its burning like but when i took off 1,2,3,4 i had to stop so i pulled clutch/shut off and did it again (on the same new plugs). ( due to loose dirt it did not take long to get though the gears so not much engine load)

 

 

chop was done on 155mains clip in middle position on oko 30s avgas/94 mix

 

 

what is a good coil to get ?? and does 141/141psi comp on 20 cc domes, ASL with dune/play port sound normal ?

 

thanx guys.

 

 

 

Secondary must be tested lead to lead. Remember to add the wire resistance if you test with them in the circuit. I will bet your coil is fine. They rarely actually fail but the lead terminations do need fixed up every now and again... If your engine runs, your secondary sure is not O/L

 

Did you put your leads together and deduct that resistance to your measurement?

 

 

Mull Engineering

[dirtydownunder]

i have two different multimeters and they both read the same (both digital, one is autorange auto that n this and the other is manual and is only .4ohm when wires r crossed.)

 

with testing lead to lead i get 16.01ohms

with testing lead to neg on coil i get nothing

with testing - + of coil it flickers from .5 to .9 ohms

 

 

thanx.

[sleeper06]

your testing with boots off rite,if not try that next I usually get 5.5 ohms

[AKheathen]

x2 on blowits' post. you have to subtract the meters' resistance. they have an ohms zero adjustment, but not usually marked and inside, but the needle meter may have it external. even so, .1-.5 is not right, and neither is 16. just testing the coil secondary without the caps should be more like 5k area

[dirtydownunder]

testing lead to lead with no plugs caps gives me 5.8ohms.

 

i tested my mates coil and that was exactly the same, as well as the mixed polarity wiring to the coil. (both 08 banshee's)

 

im running outa things , trying to find a dyna coil, but as my work is closed on holidays i cant get it delivered.

 

 

thanx guys.