2 Strokes Down Under

ok just fitted a sh engine to the rgv-pv shit itself and the cylinder

have the bottom cylinder not firing strong and top cylinder firing strong - exhaust pulses coming out of the end pipes

i have fuel dripping out of the exhaust port of bottom cylinder onto the ground

what i have done to check
replaced plugs with new
replaced bottom coil
replaced carbs

bike starts first kick
engine will run strong with bottom plug lead removed
engine will run not strong with top plug lead removed

it looks like something wrong with compression me think but i dont have a tester

will a 4 stroke compression tester work on a 2t and is the procedure the same me ask

cheers mike

yes, same tester, same procedure,

are you getting a decent spark on bottom cylinder?

I guess thats your first question which you need to ask yourself to determine whether you've got a fuel/compression issue or an electrical issue

cheers for jeram

changed the coil and plug so iam confident thats eliminated

would be looking at the CDI (not SAPC) unit , I would be swaping that to begine with. Seek out anyone who has installed a Ignitech/Zeel as that become redundant then

2TInstitute wrote:would be looking at the CDI (not SAPC) unit , I would be swaping that to begine with. Seek out anyone who has installed a Ignitech/Zeel as that become redundant then

ok

thanks for that
just done a ct and got 140psi out of the weak cylinder and 120 out of the firing cylinder

work that out!

next track down a cdi for testing

cheers all

ok
replaced the cdi unit and pick up coils with no change in the situation

are you using resistor plugs and caps?

thanks for the reply and help

2 plugs ive used are BR9ES and BR9ECM
so yes they are resistor plugs but the caps are standard suzuki so i dont think they are resistor caps

though ive changed the bottom coil with another with no effect i might swap the top coil over to see if it makes a difference

cheers mike

try non resistor plugs as every rgv plug cap I have measured is 5k Ohms

thanks for that
i will order a new plug

cheers mike

OK I FEEL LIKE A RIGHT DICK

sorry for not giving the full story but i forgot to say i fitted a set of pipes i had lying around i picked up with a project bike and installed them as they had some nice stingers fitted

so after thinking for a bit that was what the problem was

blocked stinger-just imagine all that backpressure

shall fit another pipe on the next day or two and should work well

oh well, atleast you got it sorted mate

bit of wasted money on your part though, I guess youve got a good pile of spare parts now

Your 'expert stroker' status might be revoked

2TInstitute wrote:Your 'expert stroker' status might be revoked

trouble is i got that from posting not diagnoising

different pipes on now and runs a dream

lucky i had all those parts lying around

thanks for the support
cheers all