Supercharged Apex will not start!!! help

[nate007]

Please add your location to your profile as well, thank you.
Might be someone in your area here that would be glad to help!

 

[Yamaharider74]

Same problem with my 06 Yami with mpi supercharger

Hello I thought I was the only one with a sled that I parked last year startedit once last summer , went to start it this fall and same thing no start
Checked and have done all the same things you have tried , I have only 60 pounds of compression all across its strange why it would run fine before but not start now

 

[Geminijoe]

Re: Same problem with my 06 Yami with mpi supercharger

Hello I thought I was the only one with a sled that I parked last year startedit once last summer , went to start it this fall and same thing no start
Checked and have done all the same things you have tried , I have only 60 pounds of compression all across its strange why it would run fine before but not start now

what did you (or didn't you) figure out?

Here is where i am at now..
after soaking with a combination of snake oils
I have the compression to 130-140lbs
bought a leak down tester and cyl are #1 20% #2 20% #3 35% #4 25%

still no start (changed plugs multiple times!!)
checked injectors again (how i did it, (correct me if this is wrong way), fuel rail pressurized no fuel coming out of them (meaning far as i am concerned they are not stuck open) pulled throttle wide open looked in the throttle bodies and can see mist of spray from each injector while cranking over )meaning they are opening and closing)

cleared out the cyl (cranked it with no fuel pressure and disconnected the ignition coils) put in new plugs, sprayed either in the throttle bodies (I know thats bad to do, but getting desperate!!) and nothing! not even a hint of turning over. I think even with poor compression either should have made it want to start.

new development was/is the 10amp fuse that controls the fuel pump (and i believe the injectors) keeps blowing. it will hold fine when cranking the sled but as soon as i touch the throttle it blows (not sure what that is about!!)

someone is telling me maybe a crank position sensor?? anybody have thoughts on this? not sure what it will do.

I also checked my ignition coils (on my meter they are way out of spec, so i suspected this maybe yet another issue, however as not o meter are exact i checked a known good one and it was the same, so that can not be it)

I am still wondering why after holding the throttle down 1/2 to 3/4 while cranking for a good long time i can get it to start (sometimes) (runs like crap and not on all 4) and i can get it to live for a while just holding the trigger a touch but once i let it go it stalls and will not start again (also after a couple min trying to hold it and keep it running it will stall on it own). and when i do this and pull plugs they are black!

 

[Yamaharider74]

Mine still not running

Hello my sled won't even try and start even holding the throttle ,I have fuel and spark but no go compression is down to low to run , I am pulling the motor next I must have cooked the rings in it last run of the year check pistons and rings out , go from there will keep you posted on what I find

 

[rxrider]

How did you store Your sleds over the summer?
Inside or outside?
The exhaust and intake valves may have rusted and will not seal. Loosing compression.
If it runs it will clean out after a while, the rust just wears off. It's possible.....

 

[Geminijoe]

How did you store Your sleds over the summer?
Inside or outside?
The exhaust and intake valves may have rusted and will not seal. Loosing compression.
If it runs it will clean out after a while, the rust just wears off. It's possible.....

Stored inside, unheated garage.
did leak down test and it appears there is no leak from valves (can not hear anything thru throttle bodies or exhaust when piston is at TDC