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Dumbfounded

  • Thread starter Thread starter Anonymous
  • Start date Start date
I stopped and bought "o" rings at my local dealer. The reason that I didn't have a clue was because there weren't any on my carbs. I now remember seeing the grooves on the carb outlet. Bells and whistles went off in my head. I wonder why the previous owner never reinstalled them!

That will make things easier.

Thanks for all of the help,

Dave W.
 
I imagine most people dont know there are supposed to be "O" rings there and when they look at the old one, theyre normally aged, hard and mashed flat. They dont recognize them as "O" rings. (they should be round and pliable) :-) :-)

Earl

herco said:
I stopped and bought "o" rings at my local dealer. The reason that I didn't have a clue was because there weren't any on my carbs. I now remember seeing the grooves on the carb outlet. Bells and whistles went off in my head. I wonder why the previous owner never reinstalled them!

That will make things easier.

Thanks for all of the help,

Dave W.
Click to expand...
 
One word,

VARRRRRROOOOOOOMMMMMMM!!!!!!!!!

Its like having a new bike. I cleaned all of the jets and cleaned the bowls. I blew air through every opening I could find. I installed the induction "O" rings (thanks Earlfor), set the fuel mixture screw at 1 3/4 out, and the side air screw at 1 3/4 out. I thought that might give me a good baseline. I used to feel hesitation at low RPMs, now there is none. All there is to do yet is to replace the exhaust gaskets.

For those of you that dont know when your induction "O" rings were replaced, take a few hours and do it. I paid $1.11 for each. Probably the best $4.44 I have ever spent. It really is like a new bike, and wasn't hard at all. If I can do it any one can.

I have 102.5 main jets and a 15? idle jet. Does that sound right for a 79 750e with a 4-1 exhaust?

I'll have to do a little tweaking with the air screw until its perfect, but OH what a feeling.

Thanks to all,
Dave W.
Mount Joy, Pa.
 
I'm happy youre up and running now. Way to go guy...good wrenching. :-) :-) A 102.5 and a 15 are stock sizes. Apparently the fella that put the 4 into 1 on it did not rejet. However, if it runs fine, I wouldnt change anything just yet. I would watch the plug colors and keep an eye on the center ceramic color for a bit to check mixture, You should be burning about a midrange darker tan to light brown. I have my fuel pilot set to 1 1/2 turns out and my airscrew set to 1 3/4 turns out. Again, if youre running fine, I wouldnt change it. The idle mixtures on my bike with those settings are such that starting is pull half choke, engine turns over once or twice and starts, hold choke for 5 seconds, push choke all the way in and slightly crack throttle. Another five seconds and I have full throttle available and can ride away. :-) :-)

Earl


herco said:
One word,

VARRRRRROOOOOOOMMMMMMM!!!!!!!!!

Its like having a new bike. I cleaned all of the jets and cleaned the bowls. I blew air through every opening I could find. I installed the induction "O" rings (thanks Earlfor), set the fuel mixture screw at 1 3/4 out, and the side air screw at 1 3/4 out. I thought that might give me a good baseline. I used to feel hesitation at low RPMs, now there is none. All there is to do yet is to replace the exhaust gaskets.

For those of you that dont know when your induction "O" rings were replaced, take a few hours and do it. I paid $1.11 for each. Probably the best $4.44 I have ever spent. It really is like a new bike, and wasn't hard at all. If I can do it any one can.

I have 102.5 main jets and a 15? idle jet. Does that sound right for a 79 750e with a 4-1 exhaust?

I'll have to do a little tweaking with the air screw until its perfect, but OH what a feeling.

Thanks to all,
Dave W.
Mount Joy, Pa.
Click to expand...
 
Dave/Herco wrote:

I paid $1.11 for each. Probably the best $4.44 I have ever spent. It really is like a new bike, and wasn't hard at all.
Click to expand...

Well, don't get all happy yet..............you haven't received Earl's bill yet :lol: :lol: :lol: .............the man ain't cheap :lol: :lol: :lol:
 
Great big GRIN :-)

Earl

frosty5011 said:
Well, don't get all happy yet..............you haven't received Earl's bill yet :lol: :lol: :lol: .............the man ain't cheap :lol: :lol: :lol:
Click to expand...
 
herco said:
I stopped and bought "o" rings at my local dealer. The reason that I didn't have a clue was because there weren't any on my carbs. I now remember seeing the grooves on the carb outlet. Bells and whistles went off in my head. I wonder why the previous owner never reinstalled them!

Dave W.
Click to expand...

I got another motor from a mate a while ago. He had blown a hole in one piston and swapped the motor out but didn't need it any more. The head on each cylinder showed a black mark where the induction tube O-Ring had been. On the holed piston the O-Ring had been installed with a loop of rubber out of the groove and protruding into the fuel-way. That cylinder had been sucking air through the resulting gap for a long time, making that cylinder too lean and heating the plug to the point where it burnt through the piston.

Kim
 
got another motor from a mate a while ago. He had blown a hole in one piston and swapped the motor out but didn't need it any more. The head on each cylinder showed a black mark where the induction tube O-Ring had been. On the holed piston the O-Ring had been installed with a loop of rubber out of the groove and protruding into the fuel-way. That cylinder had been sucking air through the resulting gap for a long time, making that cylinder too lean and heating the plug to the point where it burnt through the piston.
Click to expand...
Thanks for posting that I'll definatly watch out for that when I'm putting mine back together. 8O
 
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