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Post by dragono on Aug 11, 2014 13:46:01 GMT -5
The above posted is the video I just took. Accompanied by the slightly lower RPM's that you can hear is a slight pop that cant be heard in the video. I've tried different carbs and I have put different gaskets on there. Even tried different jets. I had read on another thread that this guys engine cylinder head had cracked. Hopefully thats not my case any other way to tell? Its only at about 7/8 to full out WOT.
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Post by alleyoop on Aug 11, 2014 14:03:51 GMT -5
It is LEAN the rpms are going up and down needs more fuel also the thinny sound indicates a lean condition. What size pilot and main jet are in that carb.
If it pops coming down to idle it needs more fuel at low rpms, IF the idle is to low you can raise the idle a little.
Alleyoop
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Post by dragono on Aug 11, 2014 14:12:44 GMT -5
I tried a #105 and a #110 maybe I should keep going up?
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Post by alleyoop on Aug 11, 2014 14:15:48 GMT -5
Yes try a 112 and a 115.
how about the PILOT JET what size is it. Also is the motor bored out or stock and what motor is in there, the motor sounds strong.
Alleyoop
How many turns out from the closed position is the Fuel Ratio Screw?
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Post by dragono on Aug 11, 2014 14:36:36 GMT -5
It has a newish top end on it. (150cc) I Just tried a #120 (didnt have anything else in between)jet and it does the same thing but is now bogging at the top end also. Like I can hear the bog and the pop. I dont quite know what the pilot jet is as there is no writing on it.
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Post by alleyoop on Aug 11, 2014 15:46:06 GMT -5
Yea if its popping with the 120 that is to much fuel. If its a stock 24mm carb it probably has a #35 if you did not change it.
Have you checked for AIR LEAKS?
How many turns out do you have the Fuel Ratio Mixture? Just shut the motor off and turn it clockwise until it stops and count the number of turns it takes to stop. Then you can turn it back out the same number of turns. I am trying to see if the pilot jet is to big or to small.
Try this:
Try the throttle at lower rpms and see if the RPMS bounce there as well or only near WOT.
Alleyoop
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Post by dragono on Aug 11, 2014 17:09:35 GMT -5
Wow it was 1 and a half turns out only. Found out intake manifold O ring was completely gone. Replaced that, still no change. With exhaust off I still get back fire aswell. I dont know where any other air leak could be .
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Post by alleyoop on Aug 11, 2014 17:21:28 GMT -5
The Exhaust Bro, it is sucking in a lot of air without the muffler on. You need to put the exhaust on otherwise you will burn the exhaust valve and do more damage.
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Post by dragono on Aug 11, 2014 17:41:33 GMT -5
I know I was just seeing if there was any noticeable difference. It will run just fine until I'm almost to WOT. Then it's back fire city. I have already taken the head off to check for a crack. And while doing so I made sure everything was times correctly while reassembling.
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Post by dstenersen on Aug 11, 2014 18:36:51 GMT -5
What about the exhaust gasket? Was there one when you took the exhaust off? Mine didn't have one when I did mine off.
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Post by dragono on Aug 11, 2014 18:39:05 GMT -5
Yep Gaskets the little donut one. Sitting right in there.
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Post by geh3333 on Aug 11, 2014 18:50:08 GMT -5
When was the last time you changed the exhaust gasket . Those gaskets don't hold up that good if you keep removing the header from the head . You should always change them after everytime you break the seal.
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Post by dragono on Aug 11, 2014 19:07:07 GMT -5
I had actually got that one today because I thought the gasket I had in there was not good anymore so i replaced it only to run into the same problem.
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Post by alleyoop on Aug 11, 2014 21:58:44 GMT -5
So your sure you have no AIR LEAKS? Have to go by what you say.
If no air leaks then I have to suspect the timing is off if it starts backfiring getting up to speed.
So take a couple of pictures or a video of the Cam with the two little holes even with the head as if your going to adjust the valves and a shot of the flywheel to see where the case pointer is pointing to on the flywheel. You may think you lined it all up right but you can be off 10-20 degrees or more.
Alleyoop
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Post by dragono on Aug 11, 2014 22:38:39 GMT -5
I will take pictures tomorrow morning. To pour salt in the open wound my transmission belt seems to be slapping now.  And sliding on the clutch bell and somehow I sheared all the teeth on the variator fan. (i think thats the name of it. It sits directly opposite of the unit that houses the roller weights.) Luckily I had another Piece out back. But i'm still getting a screaching noise. |
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..BAD TO THE BONE..
