Author Topic: Cb750K1 Idle Air Adjustment Screw replacement  (Read 740 times)

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Offline NHdude

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Cb750K1 Idle Air Adjustment Screw replacement
« on: January 31, 2018, 02:01:32 PM »
Firstly, I'm no mechanic... that said,  I have a CB750K1 that has sat for the past 20 years or so.  A few years ago I opened up the petcock and gas flooded out of the carbs.  Obviously all gummed up.   So, going to sell the bike but thought it would be worth quite a bit more as a runner.  Had 4 carb kits I bought many years ago and took everything apart, cleaned it all up, and installed the new parts.  One thing I noticed, however, is that  the new Idle Adjustment screws are different from the ones I took out.  Originals appear to be a solid screw.  New ones are hollow with hole in the side.  I put them in but now wondering if I should put the old ones back in.

Any advice most welcome!  Thanks in advance!
« Last Edit: February 10, 2018, 06:18:13 PM by NHdude »

Offline ekpent

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Re: Cb750K1 Idle Adjustment Screw replacement
« Reply #1 on: January 31, 2018, 02:36:27 PM »
 Those are actually 4 air adjustment screws. Make sure they still have their springs. There is only one idle adjustment screw and it has a large knurled head that screws in and raises the arms that control the slides and needles.
  I as a rule always re-use the stock Kehein  brass bits including those screws and jets etc. whenever possible.

Offline Yamahawk

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Re: Cb750K1 Idle Adjustment Screw replacement
« Reply #2 on: January 31, 2018, 03:09:55 PM »
+1 on reusing the stock air adjustment screws, or fill those holes with JB weld to seal them.
Charlie
1971 CB750K1 (newest bike), 1996 Royal Enfield 500 Bullet (therapy bike), 1981 Yamaha XV920RH, 2006 Kawasaki Concours (retirement bike), 1975 Yamaha RD350 (race bike), 1989 Honda VTR250 Interceptor (race bike), 1986 Kawasaki EX250 Ninja (race bike in progress), 1985 Honda Elite CH250, 1973 Yamaha GT1 80cc, 1974 Yamaha DT360 project bike.

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Offline NHdude

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Re: Cb750K1 Idle Adjustment Screw replacement
« Reply #3 on: January 31, 2018, 03:46:49 PM »
OK, thanks!  Will put the original sir adjust screws back in.  What do you all use as an initial adjustment on those?  Thanks again!

Offline ekpent

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Re: Cb750K1 Idle Adjustment Screw replacement
« Reply #4 on: January 31, 2018, 04:40:11 PM »
OK, thanks!  Will put the original sir adjust screws back in.  What do you all use as an initial adjustment on those?  Thanks again!
Start them at 1 turn open from gently seated.

Offline NHdude

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Re: Cb750K1 Idle Adjustment Screw replacement
« Reply #5 on: January 31, 2018, 05:18:18 PM »
OK, thanks!  Will put the original sir adjust screws back in.  What do you all use as an initial adjustment on those?  Thanks again!
Start them at 1 turn open from gently seated.

Thanks!

Offline Dunk

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Re: Cb750K1 Idle Adjustment Screw replacement
« Reply #6 on: February 01, 2018, 07:03:31 PM »
If you're selling the bike I may be interested. Pics, description and price?

Offline NHdude

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Re: Cb750K1 Idle Adjustment Screw replacement
« Reply #7 on: February 10, 2018, 06:17:38 PM »
If/when I'm ready to put it up for sale I will let you know and send details!S.  Thanks.