|Posted on Wednesday, March 31, 2010 - 09:22 pm: ||
So here's the deal, I put a NRHS 150 kit with thunderstorm heads with NRHS stage 2 light work, mikuni hsr42,SE 536 cams,.060 shorter fixed pushrods,stock lifters,stock rockers,stock intake,force street fight exhaust and an ultima programable single fire ignition on my 98 S1.
I have good vale to piston clearance, squish band is good(.028-.038), My cams are properly timed( all the dots line up)
I was told by NRHS to use a#30 pilot jet #165 main jet and to set the c-clip in the center groove of the needle.
I installed the ignition as per the instructions using their coil and the stock voes switch. The ignition has a led for static timing the motor and it says turn the motor over by hand until #1 cylinder is at TDC on the compresion stoke then rotate the ignition clockwise just until the led goes off and tighten down the ignition which i did.
Now when I try and start the bike all I get is back firing out the exhaust.
I've checked for spark its good at both cylinders, rechecked the static timing,then I thought the back firing might be from a rich condition, so after stepping down from #30 to #27.5 to #25 starting the mixture at 2 full turns out for each and going leaner half a turn at a time all I get is more back firing.
CAN SOMEBODY PLEASE TELL ME WHAT I AM DOING WRONG?????
|Posted on Thursday, April 01, 2010 - 09:51 pm: ||
|Posted on Friday, April 02, 2010 - 01:10 am: ||
Well, if you had a stock ignition module, it should start right up. But you have an aftermarket ignition module, so I don't know what problems that brings to the table. You said it is programmable, so how do you know if it is programmed correctly?
Why don't you borrow a stock ignition module and see if it starts?
|Posted on Saturday, April 03, 2010 - 07:58 pm: ||
well here's what i found so far, have poor compression on rear cylinder i used a modified compression tester and my air compressor to presurize the cylinder on TDC on compression stroke,front cylinder was good just a very litte air going by both valves and ring but just blowing out exhaust valve on rear cylinder.
so after a testing cylinders with compressed air again with rocker boxes off no leaks or rear any more so no bent valves.
after removing exhaust I visually inspected exhaust valve on BDC intake stroke and TDC on compression stroke and the exhaust valve is being held open on both.
I visually inspected both exhaust pushrods seem to be the same not enough to hold the valve open .030 or so.
Then I reinspected cam timing and all the dots line up, so as best I can figure I have a bad cam or cams brand new SE out of the box I plan to measure #1 and #4 cams tomorow and compare.
If anybody else has any other ideas please share.
|Posted on Saturday, April 03, 2010 - 08:02 pm: ||
I was told by NRHS that i couln't use a stock ignition withe those cams because the intake stroke is starting when you would get the wasted spark so I have to use single fire,otherwise I would have.
|Posted on Saturday, April 17, 2010 - 05:44 pm: ||
Well,called NRHS sent me shorter pushrods, problem solved,started it this morning and ran it through all 4 heat cycles today, Stillonit,Sparky, thanks for your replies