Dumbfounded

[Anonymous]

Thanks for the quick response. I forgot to mention that spring, That one is where it's supposed to be.

Do you remember someone here explaining the method of synching carbs with out a vacuum guage. I want to check them one more time before I replace them. I can't find the post though.

Thanks,
Dave W.

[earlfor]

((((( I'm not sure if I was clear..... I did not mean the "O" rings inside the carbs. The "O" ring I was referring to is about 1 inch diameter and there is only one for each induction tube. It rests in a groove on the induction tube end that is mated to the cylinder head. The "O" ring goes between the induction tube and the cylinder head. There isnt any kind of "assembly", it is only a large "O" ring.)))
[quote="herco"]........got her torn apart again and I will replace those "o" rings. Do you get the complete assembly or is there an inner ring I have to look for? I'se got to gets my induction systems workin. (good advice as always Earlfor)



(((((( I assume you are talking about replacing the valve cover gasket and if that is the case, sure, I would go ahead and replace it if it is leaking. If youre actually talking about the cylinder head, I would not go to that much work for a tiny leak that is taken care of with an occasional wipe with a rag. If you have a torque wrench, you might be able to stop the weep by retorquing the bolts.))))))
QUOTE:...... Since I'm this close to the head gasket can I replace it w/o sending the head out for inspection. It was seeping a small amount, nothing a quick wipe with a rag couldn't fix, but since i'm close would it be worthwhile replacing it. I'm picturing just cleaning the surfaces, putting the gasket on and torquing to spec's. Is it that easy?


((((( I cant think of any small springs on the throttle or choke cables. ))))
QUOTE....When I was removing the throttle and choke cables from the carbs a small spring fell free. I've never noticed that spring before. Does anywhere know where it belongs?


(((((Usually there will be a number stamped on the jet, but I find the only way I can read it is to take it out, hold it under a strong light and use a LARGE magnifying glass. :-) )))))
QUOTE;....Is there a way to tell what size jets I have inside the carbs? I can't find any markings.

Earl

[Anonymous]

Thanks Earlfor,
I will be replacing the valve cover gasket. And I'll try retorquing the heads.

The "O" ring is that complete plastic housing. I guess I'm asking if the new "O" rings screw right on at the two screw holes, or if there is an inner ring I need to worry about. I'm not looking at the induction tubes right now, but I think they're larger than an inch in diameter. They're probably closer to two inches.

I know I have a long way to go, but it will be worth it. I'm on a mission, If I have to touch it, its getting replaced.

Thanks, Dave W.

[skip]

If you want to know if its that one carb giving you trouble start the bike and drain that carb bowl, put a small cup under it so the gas wont fill back up in the bowl and you know that carb is empty. now spray some starter fluid into the throat of the carb and if the cylinder fires and the bike runs on four you know its the carb. Be careful !

[dgeorge]

Dave the o-ring they are talking about is between the intake and the head if you go here there is a very good picture of it. http://home.att.net/~robert.barr/intake.html When you get the new ones they will be round not flat like in the picture. ( thought I had gotten the wrong thing when I first picked them up )

[Anonymous]

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.

[earlfor]

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

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.

[Anonymous]

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.

[earlfor]

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

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.

[frosty5011]

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.

Well, don't get all happy yet..............you haven't received Earl's bill yet .............the man ain't cheap

[earlfor]

Great big GRIN :-)

Earl

Well, don't get all happy yet..............you haven't received Earl's bill yet .............the man ain't cheap

[Anonymous]

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.

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

[dgeorge]

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.

Thanks for posting that I'll definatly watch out for that when I'm putting mine back together. 8O