Author Topic: keyster carb rebuild kit (Read 12134 times)

paddy paul · « **on:** January 13, 2012, 10:27:36 AM »

Just got my Carb rebuild kits from keyster for my 76 750, and included in the kit is 1 rubber o-ring, can someone tell me what and where this goes, I have no idea and I have never come across any rubber in rebuilding these carbs in the past.

JimM68 · « **Reply #1 on:** January 13, 2012, 10:32:48 AM »

Those kits fit many carbs and sometimes include parts you don't need. The only. O ring I can remember on a cb 750 carb would be on the fuel inlet T

Sent from my ADR6325 using Tapatalk

RickB · « **Reply #2 on:** January 13, 2012, 10:55:06 AM »

For the 400F, I thought that O ring was for the little pipe/tube that connects the individual carbs together. Not sure if the 750 carbs are built the same way though.

TwoTired · « **Reply #3 on:** January 13, 2012, 11:05:20 AM »

You mean this one?

bollingball · « **Reply #4 on:** January 13, 2012, 11:17:26 AM »

That is a good one TT

flybox1 · « **Reply #5 on:** January 13, 2012, 11:27:16 AM »

HAHAHAHHA.....TT

How about letting us in on your o-ring details...

wrenchmuch · « **Reply #6 on:** January 13, 2012, 02:17:47 PM »

If these are early carbs with the screw tops then there are 4 o rings on the tee's that connect carbs 1 and 2 , and 3 and 4 , to the fuel supply . There are also rings on the drain screws on each float bowl .

Danno · « **Reply #7 on:** January 13, 2012, 09:44:17 PM »

and the float bowl and each one of the jets and on the misture needle etc......

ofreen · « **Reply #8 on:** January 13, 2012, 10:57:30 PM »

Quote from: paddy paul on January 13, 2012, 10:27:36 AM

Just got my Carb rebuild kits from keyster for my 76 750,

I hate to be a wet blanket, but you probably aren't going to be happy with the way your bike runs with the Keyster kits installed.

frankist · « **Reply #9 on:** January 13, 2012, 11:50:02 PM »

ive had great success with their rebuild kits on my kawasaki's but then again, its just gaskets and a main jet(stock sized)/one idle screw. so not much to go wrong. might be different on honda kits?

wrenchmuch · « **Reply #10 on:** January 14, 2012, 05:53:20 AM »

Quote from: Danno on January 13, 2012, 09:44:17 PM

and the float bowl and each one of the jets and on the misture needle etc......

There are no o rings on the jets , float bowl , or mixture needle on earlier carbs . These are the carbs I think Paddy Paul's talking about .

Bob Wessner · « **Reply #11 on:** January 14, 2012, 06:29:01 AM »

Quote from: wrenchmuch on January 13, 2012, 02:17:47 PM

There are also rings on the drain screws on each float bowl .

How early is early? On the K0 there are no "O" rings on the bowl drain screws, they are washers.

ofreen · « **Reply #12 on:** January 14, 2012, 07:42:02 AM »

Quote from: frankist on January 13, 2012, 11:50:02 PM

ive had great success with their rebuild kits on my kawasaki's but then again, its just gaskets and a main jet(stock sized)/one idle screw. so not much to go wrong. might be different on honda kits?

The gaskets seem to be OK, but the metal parts are not likely to be in spec. I bought the kits for needle jet sets off of Ebay because those parts were worn in my carbs. The price was the same for the Keyster kits as it was for just the stock Honda needle jet set. Turned out to be not bargain. The taper on the jet needles was way off, and the kits didn't include the jet. So I had to buy the Honda parts anyway. If you need gaskets, the kits might not be a bad buy just for them, but I've never priced the OEM gaskets.

Ernest T · « **Reply #13 on:** January 14, 2012, 05:53:16 PM »

Ditto on the Keyster needles not having the right shape. I've used the gaskets and o-rings, but I throw the needle away. If the price is the same, buy Honda OEM parts and you'll be happier.

HondaMan · « **Reply #14 on:** January 14, 2012, 09:31:47 PM »

Quote from: Bob Wessner on January 14, 2012, 06:29:01 AM

Quote from: wrenchmuch on January 13, 2012, 02:17:47 PM
There are also rings on the drain screws on each float bowl .

How early is early? On the K0 there are no "O" rings on the bowl drain screws, they are washers.

Roger that, and starting with the 657B carbs, some had O-rings on the bowl drain screws instead of the metal washer.

HondaMan · « **Reply #15 on:** January 14, 2012, 09:34:42 PM »

Quote from: Ernest T on January 14, 2012, 05:53:16 PM

Ditto on the Keyster needles not having the right shape. I've used the gaskets and o-rings, but I throw the needle away. If the price is the same, buy Honda OEM parts and you'll be happier.

Not only are the Keyster needles the wrong taper, but their float valves have springs too strong. This causes very low float bowl levels, poor idling, and great hesitation when pulling open the throttle. The only part of the Keyster kits that I have been able to easily use is the float bowl gasket, and you can get these at PartsNmore or VintageCB750 (or others) alone.

ekpent · « **Reply #16 on:** January 15, 2012, 05:45:14 AM »

Not sure if they were Keyster but changed out some aftermarket #40 slow jets back to stock pieces. They were way out of spec,holes were too large and know they had not been drilled. Compare the parts carefully if you use them.

andy750 · « **Reply #17 on:** January 15, 2012, 10:34:27 AM »

Anyone got a good source for the Honda OEM carb kits? Does each kit come with jets and needles? Are the sold individually or as a set of 4?

thanks
Andy

chewbacca5000 · « **Reply #18 on:** January 15, 2012, 05:24:25 PM »

Quote from: andy750 on January 15, 2012, 10:34:27 AM

Anyone got a good source for the Honda OEM carb kits? Does each kit come with jets and needles? Are the sold individually or as a set of 4?

thanks
Andy

I would like to know as well. Especially for the needles and seats.

HondaMan · « **Reply #19 on:** January 15, 2012, 07:19:07 PM »

Quote from: chewbacca5000 on January 15, 2012, 05:24:25 PM

Quote from: andy750 on January 15, 2012, 10:34:27 AM
Anyone got a good source for the Honda OEM carb kits? Does each kit come with jets and needles? Are the sold individually or as a set of 4?

thanks
Andy

I would like to know as well. Especially for the needles and seats.

I recently used some "Made in Japan" float needles and seats that had springs softer than Keyster's. They were not Honda parts. I ended up making the float level 1 mm richer with them, and they worked out well. Their spring is not quite as soft as the OEM Honda spring, but it is far softer than the Keyster.

With the Keyster, the only way I have been able to make them fill the bowl at highway speeds has been to raise the floats (750) from the stock 26mm to 23mm setting. This requires fuel shutoff every time the bike is parked, as they will dribble fuel out the overflows on the low side of the bike at this level.

Ernest T · « **Reply #20 on:** January 16, 2012, 08:12:14 AM »

Quote from: andy750 on January 15, 2012, 10:34:27 AM

Anyone got a good source for the Honda OEM carb kits? Does each kit come with jets and needles? Are the sold individually or as a set of 4?

thanks
Andy

Honda doesn't sell an inclusive kit, you have to buy each part seperately and they are expensive! They work right out of the box without fiddling and that's priceless.

andy750 · « **Reply #21 on:** January 16, 2012, 09:03:36 AM »

Sorry to be dense but does that mean needles are sold individually? Looking at Bikebandit.com they list a needle,jet set at $25.71 - is that per needle or for all 4?

http://www.bikebandit.com/houseofmotorcycles/1974-honda-cb750k4/o/m9235#sch397870

Thanks
Andy

Ernest T · « **Reply #22 on:** January 16, 2012, 09:13:34 AM »

You need 4. Here's cheaper place to buy.

ref Part Part Nr. Qty Retail Your Price
03 NEEDLE SET, JET 16012-300-014 004 $25.71 $19.27

http://www.powersportscompany.com/fiche_section_detail.asp?section=126188&category=MOTORCYCLES&make=HONDA&year=1974&fveh=3002

ofreen · « **Reply #23 on:** January 16, 2012, 09:32:00 AM »

Quote from: andy750 on January 16, 2012, 09:03:36 AM

Sorry to be dense but does that mean needles are sold individually? Looking at Bikebandit.com they list a needle,jet set at $25.71 - is that per needle or for all 4?

My local Honda dealer sells them for $22 a set. Not cheap, but my last set went 80,000 miles as I recall.

andy750 · « **Reply #24 on:** January 16, 2012, 02:16:56 PM »

Ok thanks. Time to get the wallet out $:-\$

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Author Topic: keyster carb rebuild kit (Read 12134 times)

bollingball