Woops my post was for an other thread.

I have a RedMax EBZ8001 backpack blower that exhibited similar issues. Granted, it's a 2-stroke.

Would NOT start no matter what I did to it. I eventually tried pouring some motor oil (whatever was laying around) in the spark plug hole and it started RIGHT up. Ran like brand new. If it sits for any length of time, though, it acts up again.

Weird, right? I was going to suggest trying some motor oil in the cylinders to see if it would make it start up.

Quote from: Kijona on March 29, 2012, 09:47:07 PM
I have a RedMax EBZ8001 backpack blower that exhibited similar issues. Granted, it's a 2-stroke.

Would NOT start no matter what I did to it. I eventually tried pouring some motor oil (whatever was laying around) in the spark plug hole and it started RIGHT up. Ran like brand new. If it sits for any length of time, though, it acts up again.

Weird, right? I was going to suggest trying some motor oil in the cylinders to see if it would make it start up.

2 strokes can do this because the rings get carbon-ed up. The oil you put down the cylinder broke them loose and they started to seal again. This is not an inherent problem with 4 stroke engines unless your valve seals are so bad your burning lots of oil.



Compression test can be done on a cold cylinder, and your results should show that you are on the lower end of the service limits. When warmed up you should be on the upper end of the readings.


Definitely try to put some motor oil in the plug hole (about 2 tablespoons), crank it a few times to distribute then redo the compression test. As stated if the numbers improve you need to rebuild the top end, if not, it's your valves.

let us know the results.

Quote from: Manaenrc on March 30, 2012, 05:46:03 AM
Compression test can be done on a cold cylinder, and your results should show that you are on the lower end of the service limits. When warmed up you should be on the upper end of the readings.

My manual said 114 psi was the low end of serviceable, and only if the other cylinder is 142 psi or above with a maximum 28 psi difference between cylinders.  These are numbers for a warm compression test.

Tomb is becoming a gs engine guru by trial and error, sweat, tears and blood. I feel sorry for ya buddy. 

hahaha its all good.

I am fairly confident 1 of 2 options will pan out.

1. I hear good news on Saturday and get $2K for this sucker. (already have an SV650 picked out if its still there and worth it)

2. If problems continue to point to the top end, swap over every single better part from the old engine into a freshly clean and honed top end.

No gas hooked up right now, but I will go out and do another compression test with oil down the plug holes.
Not worried about that as I know ALL the internals and head on the old engine are 100%.
So I can swap if I keep it and have it going.

and I will be getting some fresh gas later on today as the tank was pretty low and it looked a little cloudy from a little bit of surface rust.
and see how that goes.

kk out I go.
results in a min.

results are in.

and sorry drop, no tears for anything that isnt flesh 
everything else tho! hahaha

kk right side about 85 PSI now vs 60ish before.
left side 90 PSI vs 60ish before.

with about 3/4 an oil cap full of oil down the plug holes.


I had those numbers on a freshly clean, honed, and rebuilt top end with the old engine prior to it starting tho.
and that was running GREAT!... minus the dang oil leak!!

so...
only going to try some fresh gas next and if that doesnt do it.
then im taking the head off and inspect the valves and then look down into the cylinders.

anything appearing to be off in the Slightest will be replaced with working parts from the other motor.

if it doesnt sell.
and im actually half and half on that now that I've had a few days to rest, relax, and unwind.

if it sells, great.
if not, it wont bother me in the slightest.
at least not until I do all the work I plan and have more problems. hahaha

Sounds pretty low. And the oil made a big difference in pressure. I'm willing to bet rings are worn.

Quote from: dropitlow88 on March 30, 2012, 08:20:39 AM
Sounds pretty low. And the oil made a big difference in pressure. I'm willing to bet rings are worn.

yeah but I dont think it wouldnt start because of those numbers.
because as I said, I had those low numbers on my old engine when I redid everything prior to starting it for the first time.

I guess when I get some fresh gas later today, i'll put some oil down the holes again and see if it starts up finally.

im fairly confident if I put my old head on it, that it will be Golden.
as this problem didnt start until I messed with the valve clearances.
tho I didnt do anything wrong except for forgetting to fully tighten down the one cam shaft half moon thing.

UGH!
now im getting back into the mood to work on it!
but I just cant pass up that offer, so I will be patient until tomorrow.

kk time for a nap after workin all night

UGHHHHHHH   

Predicament now!!!!   

Got it started!

I honestly dont know HOW I did it.... but I had the intake valves at .013mm each.
Maybe I mixed the shims up between them... hahahaha

Put the correct shims in and then it took me like 4 friggin tries to get the timing and cams set right! haha
front one kept poppin one link when I went to the back one because I didnt pull enough slack from the front. haha

Then I forgot to let the tensioner loose when I cranked it by hand, so it jumped a few... haha UGH was I mad!

Idle still hangs a bit.
and sometimes I need to give it a little more throttle from a start to keep it from stalling.
Also some slight popping out of the exhaust with no slip on yet.

took it around the block and REALLY opened her up after letting it warm up properly.
no complaints on the power again.
and didnt bog down when I gave it gas this time.

but it just doesnt "Sound" right.

About to go out and make a quick video of it running.

but I would GREATLY appreciate it if anyone who knows what to listen for watches the video ASAP after I upload it.

as I wanna know if anything is wrong, what to do to fix it...

and then the Predicament of, if I really wanna sell it now!
(still leaning towards yes, but if its 100% now... thats ALOT to think about)
aka: my hard work being finished and able to be ridden is worth more then $$$$

kk out i go to make the video

ugh stupid thing!
meant to edit, not reply!!

So, if I understand right, you found valves too tight causing poor sealing and resulting low compression. Not clear to me but also possibly found cams slightly out of phase (chain skipped a tooth?)

Congratulations on sticking it out and finding the problem(s)!  Next let's get that thing tuned up. For 'not sounding right' be sure to put fresh crush washers on the exhaust pipe at the head...an exhaust leak can cause the hanging idle and different noise you hear.


Sent from my T-Mobile G2 using Tapatalk

hopefully it is just the exhaust thats sounding off and causing the hanging idle.

video taken!

took one but when I initially started it up again it sounded good.
minus 2 little pops out of the exhaust with no slip on.

then tried to ride with it around my wrist and it banged around too much so I stopped the video where half of it was me adjusting the camera. haha

then started another one with it safely wrapped around my wrist and went around the block.

as for the view, got no idea but should have gotten pretty good sound.

uploading now

(edit)
nah, the intake valves were too loose at .013mm instead of between .03mm and .08mm
Pretty sure I simply mixed the shims up between the 2.

kk video is uploading now

(edit)
stupid photobucket!
gave me an error.
uploading it to facebook now.
meanwhile, back outside to put the gimbel headlight cowl together.         

(edit)
kk heres the video.
http://www.facebook.com/video/video.php?v=3581821105393

sounds like it could be an exhaust leak, hard to tell, your camera muffles alot of the mechanical noise, it sounds alot like mine riding down the road. kind of a sputtering at low throttle inputs at 3-4k rpms. I'd like to hear the input of others around here

The idle is hanging because it is running lean on the idle. Get your exhaust back on there and it will probably settle down. The lack of restriction will cause a major lean condition. If you are going to put a better flowing muffler on there you may need to go larger on the pilot jet. I'm actually surprised it isn't popping more on deceleration.

It's hard to hear the engine noises with the loud exhaust since your phone will reduce the volume to the loudest noise which is your exhaust. But I couldn't hear anything that sounded awful.

How in Gods name are you holding the phone and shifting at the same time LOL

HAHAHAHHA
its my digital camera.
I have the carry cord wrapped around my wrist twice.
otherwise it bounced around TOO much.

and just got done putting it together and the pipe on.
its actually poppin more now.
might even up when I take it for a ride if it doesnt rain in a few mins.

and I have 40 pilots so I should be good.

(edit)
just took it for a ride down the main road (wanted to go around town and give it a good run)
but a mile or just less it started acting like it was fuel starved.
then it stalled and wouldnt start otw back and when I would crank it, would just backfire.

restarted after I pushed it about 150 yards. lol