4000rpm bog

daves79x
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Re: 4000rpm bog

Post by daves79x »

I guess the bottom line is, you can check the jets by removing #6, but as Bob said, you have no idea what the carbs are really like, what jetting, needles, really anything. They need a complete rebuild with stock parts.

A good indication that they need looked at is the fact that when you got the bike, the airbox was off. Why could that have been?

Dave

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Re: 4000rpm bog

Post by CBX-tras »

Remove the alternator and access to the #1 float bowl is about the only one you can get to in sitsu, easily.
Remove the bonnet too, check to see if the slide has the stock needle or something else. The needle should be anodized aluminum with 05F stamped near the top. If not stock, this indicates that the carbs may have been altered internally.

But, what about the exhaust? Stock, aftermarket? That can cause performance issues too.

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bobcat
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Re: 4000rpm bog

Post by bobcat »

Yeah, any way you look at it the carbs will have to come off so you might as well
get it over with and know for sure what you have. Do a compression test while the
carbs are off.
Bob
82 CBX, 81 CBX, CB1100F, 79/82 CB900F (avatar)

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bobcat
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Re: 4000rpm bog

Post by bobcat »

You might as well check the valve clearances and tension the cam chains* too while you have easy access.
Do it all and ride with confidence !

*not the FSM procedure.
Bob
82 CBX, 81 CBX, CB1100F, 79/82 CB900F (avatar)

Salman_z8
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Re: 4000rpm bog

Post by Salman_z8 »

Thats what i had thought, i will proceed to removing carbs.
And establish a baseline, worst case scenario at least i will know whats in em for brass
One day, i’ll have em all finished.

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Re: 4000rpm bog

Post by Salman_z8 »

It has a dg 6-1 on it right now, down the road will get a set of repro 6-2 pipes
One day, i’ll have em all finished.

daves79x
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Re: 4000rpm bog

Post by daves79x »

The DG will give you a mid-range stumble, perhaps not as bad as you are seeing though.

Dave

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bobcat
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Re: 4000rpm bog

Post by bobcat »

I'll bet the PO attempted to jet for the DG and, since the air box was off,
might have been planning to run pods, got the primary and secondary main
jets switched and/or put a Dynojet stg.3 kit in them. Exploration will tell.
Bob
82 CBX, 81 CBX, CB1100F, 79/82 CB900F (avatar)

Salman_z8
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Re: 4000rpm bog

Post by Salman_z8 »

Havnt had a chance to take the bank off yet, will do once the weather gets a bit cooler.
But i am thinking the same thing as bobcat
One day, i’ll have em all finished.

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Re: 4000rpm bog

Post by Salman_z8 »

Fired it up yesterday, started and idled perfect.
So naturally i blipped a throttle enough times to annoy anyone in close proximity.
Cooler day, so spent a good 4-5 mins.

Not the correct way i know, but i did check the plugs after, and indeed the plugs are sooty.
Now i was also seeing a little blue smoke, but i do think gor sure that something is off with the carbs.
Since smoke is more so evident now, that the airbox is on, so it might be that the mains are interchanged.

Who knows what else is in there for brass.
Baby sitting my daughter these days, so only get 3 hours per day during the week while she is in pre school.

On a different note, finished a few others and even sold a couple to make some room.
I have another cbx as well, a thread i started a long time ago, i think pretty soon i will start to make progress on both the x’s.
One day, i’ll have em all finished.

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