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Welcome to here Mr. Hadd! wave

I think Rick's stators are OK. I'd buy them direct from them so the warranty is simple, if needed.

https://ricksmotorsportelectrics.com/

https://www.ebay.com/itm/116528137068

thumbs up

Welcome here.

Got a pic of the part you need?.

Nollaig Chridhe, mates!

Nollaig Chridheil agus Bliadhna Mhath Ùr, Sean. Smile

Merry Christmas and Happy Hanukkah tomorrow!

Wishing for peaceful and joyous celebrations for everyone around the world for the holiday season!

Welcome back Adam.

IME, getting other members to not pollute your thread is not likely. Keeping it organized and easy to find stuff could turn into a thing with an open thread where you use subsequent posts to add stuff ...

Welcome here Hydra wave

There is valve adjusting info in the NMT, as well as quite a bit of other info on the bikes and the site.

I've had decent success with Randakk's Cycle Shakk for carb parts. thumbs up

Welcome here! Condolences about Dad.

Please read the New Member's Thread and fill in sig and location info, as explained.

Any pics of your bike?

Don't buy cheap needle valves. They can have all manner of issues like plating coming off, tips coming off, wrong length, wrong width, etc.

Those old coils develop a few issues that degrade their performance. They weren't all that good to begin with.
The HV contacts corrode and might even rot off altogether. The cases also get cracks, an ...

Old spark plugs looked good but new ngk non resistor Heat range 8 plugs also made a difference- no more back firing!!

Carbs are off for an extreme Sean G kind of cleaning and then we’re all done! ...

Those should be ok. Ideally, the inside #4 exhaust is a bit snug and could be a half size thinner shim.

Here's some info about half sizes:
https://www.cb750c.com/modules.php?name=Forums&file=v ...

"What 25mm typical OEM valve shim thickness size for these motors was when new?"

Well of course they didn't come with one size in them. They were installed with the proper thicknesses to ...

A head/header gasket leak is worth investigating if it's a pipe afterburn type backfire on closed throttle. Those donut gaskets can be tricky to seal.

OK good, getting better.

Did you look for cracks in the coil cases?

Twisting the throttle only opens the butterfly. It's the combination of load and throttle position that causes the vacuum to change and change the slide position.
Since these slides are operated by ...

Which jet circuit you're on is predicated by intake vacuum (on cv carbs) and throttle position, not engine speed.

Clean the carbs as best I could,

You don't sound too convincing. Tell us more about how you cleaned the carbs. Aside from the carbs, when was the last time the valve clearances were checked?

Ind ...

Make sure the carbs are fully seated in the insulators. It's a common issue that they don't get fitted all the way in, then leak.

Make sure that you have the carbs fully seated, the rail that holds ...

Welcome here wave

Won't rev over 5000 is often due to weak charging. You should have 14.4 VDC measured at the battery at 3000 RPM on a full battery.

The backfiring could be from a header leak or l ...

OK, how bout 3 times?

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Oh Nooooo!!!! Mr. Bill!!!!

If you go there, leave a message that you came visiting from a motorcycle club.

I'm convinced that AI is the DEVIL INCARNATE!