Topic: I broke the thingy majig...Am I in trouble?

[immortal]

Hey guys, I cant believe it. My Pegasus bike 1976 CB750F is all done, I have 1000 enjoyable California miles on her until the knocking sound starts. I cant believe it, of all the money and time I have invested it turns out out one of the very few items I did not replace went out.

Turns out its a rod bearing on the #3 cylinder so I'm pretty down about that but to add even more frustration,
like a moron I broke the part pictured while trying to get the cylinder head off. What was I thinking? I put my bar in there trying to pressure of the head and it snapped very suddenly.

The problem is I cannot find the part name or number and I don't know what it is called either. 
Scoured through fleabay but I can only see cylinder heads.  Getting it off also looks like its going to be a pain in the butt, I will probably have to use heat and or dremel away at it. But thats only if I can find a replacement.

Does anyone know what these carb intake thingy majigs are called? The parts fish has it as part of the cylinder head part number. Would have to go get a whole head again as this was machined just 1000 miles ago.

Any advise would be greatly appreciated!

[fendersrule]

If it were me, I'd cover up all the ports, use a MIG on it,  grind, sand, and polish and get it done right. That's all that's required.

If you can't weld, just take it somewhere.

Can you run it like that? Probably. But I'd hate to find out about if you were to sell the bike and I was working on it.

[754]

 Weld it, and take the. 4 bolts under the pucks out before removing head.

 If you did forget to do that you can buy a manual now or sooner. You fine will be the welding costs..

[CycleRanger]

Technically the spigots are removable. But no one ever does.. They are extremely difficult to remove intact.
You likely won't find them as a separate part.

[immortal]

As usual, great advise from you guys and I appreciate it. My excuse is I was very tired I wasn't thinking and it only took a momentary lapse in judgement and it was all over.

Ironically the shock woke me up and I had the head off the right way 5 minutes later.

OK, so my options are reapair via a welding shop or get my grubby little hands on a cheap beaten head and attempt to remove a good spigot without damaging it and install it into mine without damaging it.

Looks like repair would be option A.  Which brings me to another question, If I cut a piece of metal and work it with JB weld with sanding and finishing etc, would this work? I mean would JB Weld be OK for the temperature of the the spigot, I know it gets quite hot but I'm not sure of the temperature of the spigot

Does anyone know if JB weld would be OK? 

[754]

 Jb will probably break. Do you not have the broken piece?

[TwoTired]

My excuse is I was very tired I wasn't thinking and it only took a momentary lapse in judgement and it was all over.

Not an excuse really, just an explanation.

Does anyone know if JB weld would be OK?

Just thinking about what would happen if the JBweld failed and the engine sucked in a lump of metal that large while running, ought to convince you to correct your blunder in the proper way.

If you care about the engine that is, rather than just hiding your mistake from a prospective buyer and shifting failure costs to him.

[MCRider]

The intake side probably doesn't get that hot, being cooled with the fuel mix all the time. nevertheles I'm with TT, wouldn't want ANYTHING going down that pipe towards the engine.

I think if you hold out you'll find a trashed head you can scarf one off of. Wrench it out of both. You may trash the threads but that's OK, Glue the good one into the hole the bad one came out of. That's the fix anyway.

ASk Mike or Ken or Big Jay.

[immortal]

Thanks for the response I appreciate it.

I built this bike during recovery after being very ill from a $200 scrap bike, like most of you guys, I have a ton of my hard earned money invested plus countless hours. There is money in a lot places unseen so there is nothing im trying to hide from anyone.

This bike is my pride and joy and is not for sale, at $10,000 its not for sale. I'm not trying to bodge a fix and pass it on that's not who I am.  I just made a stupid mistake, .....what was I thinking?

I see the point about if a piece of JB weld failed and its a good valid point, I'm just looking for ideas from those more experienced than me. I just want to make it clear that I really appreciate all the advise but this is not a fix for a bike being sold.  So I guess im now leaning towards finding an old beaten up head to pull those spigots off.

Ironically I was taking this head off to send to Hondaman for a valve job, the fins are perfect and it was hot tanked and resurfaced only 1000 miles ago, this is why I'm scratching me head at my momentary lapse in judgement.

I think there is a junk head or two for around $50 - $60 on flea bay.

[Greggo]

I have a junked head I'd sell you. 

[immortal]

How much for the head with shipping to California 92691, or better still how much for one or two of the spigots off the head? I would give you a good price for the spigot so saving money on shipping the whole head.

[Greggo]

How much for the head with shipping to California 92691, or better still how much for one or two of the spigots off the head? I would give you a good price for the spigot so saving money on shipping the whole head.

I sent you a PM.  I'll check it out today after work and see if I can pull one off without breaking it

[Sara]

Hi, what is JB? And could you weld the spigot with easyweld?
Thanks
Sara

[immortal]

Sara, I'm not familiar with "easyweld" but JB weld is a synthetic metal compound. It comes in two tubes one is black the other is gray, one being the compound with the other being the hardener or activator. You mix them together into a paste.

It has its uses for little metal repairs that you can sand, although I think it is limited. I have used it once or twice on various things such as filling in the end tubes of a frame I shortened but as I say it is limited and the guys are right, it may well work but if a piece breaks of it will get sucked into the motor.

I think I need to find a spigot from a junk head and go that route.

[TwoTired]

Hi, what is JB? And could you weld the spigot with easyweld?
Thanks
Sara

http://www.jbweld.com/

Easyweld is for Aluminum or for non-magnetic metals.  I believe the spigots are steel.

[MCRider]

On a CB750, the intakes are aluminum and the exhausts are steel. I think.

[immortal]

OK so I think I'm going to have a go at removing this and replacing it with one from a junk head as I think that's clearly the right way to go. my thinking is soaking the heck out of it with the PB Blaster for a day or so then use the propane torch and heat and gently/lovingly try to get it off without damaging the fins. If that fails I will do what I have done in the past with a frozen nut and that is patiently work away at it with my dremel.

If anyone has any other suggestion your thoughts are more than welcome. Thanks again everyone for all your advise!

[TwoTired]

On a CB750, the intakes are aluminum and the exhausts are steel. I think.

If aluminum, easyweld should be a decent fix, particularly if the broken piece is still available.  A magnet should tell the story.  I don't have any loose 750 heads to personally check.  But, I DO have magnets! 

Cheers,

[754]

 They are threaded aluminum, and I have stripped two out of four removing them, plus they havebroken in shipping.
 So I will ask you one more time..Do you have the option piece???, welding can because cheap as shipping a head.

[immortal]

Oops sorry...I do have the broken piece, "two of them", it broke into two, they are pretty small.  Actually I'm shipping my cylinder head and jugs to Hondaman this week for valve work and bore work. He has not seen the photo yet but I told him about it and he also suggested he could get it welded for me.

Maybe I should take a picture of the two little pieces so you can see if it is possible to weld? Greggo said he would try and remove one from his junk head for me also. Hondaman says he has never seen one removed....the things I get myself into!