Tune up - Carb boot advise

Posted by CR125Honda on Jun 05, 2012; 9:16pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Tune-up-Carb-boot-advise-tp4022321.html

Dont think I've ever posted here so hello to all.

1974 stock CB750

I've had a slight hesitation from just off idle to a bit less than half throttle (1/8 to 3/8 ish) for a few years now. It's never been that bad but I'm bound and determined to correct it. Went through this about 8 years ago - replaced intake boots, cleaned & checked all passages, soaked the jets, check float height, adjusted valves, new points, plugs, condensers, etc.. Some of the mercury ran out of my sync tool (in a move) but there was enough to get a good sync up to half throttle. Seems like I couldn't get the engine running perfect in that range way back then.

So..... today I got motivated to pull off the carbs and give it another go.

As I pulled the carb rack, I noticed those new intake boots I put on back then, were relatively loose on the engine side. All would move up and down as I wiggled the rack to remove. Noticed staining on the engine metal lip on #3. Definitely had some leakage there. The clamps were tight but the boots are pretty hard now. Re-tightened the clamps after removing the rack and still have some wiggle.

Also noticed the rear boots (carb to airbox) pull out of the airbox really easy. It's not worn but the rubber lip that hold the boots in place are about the same size as the opening. Shrinkage ?

Plan is to buy all new boots, front and rear, check /clean the carbs & install new carb kits, and probably points, plugs, & condensers.

Anything I'm missing?

Not really on a budget but would like to get the OEM boots at a good price. I noticed a post or two recommending partsnmore in Canada. Checked their site and found they had a great deal on boots for the 78 model but didn't have any listed for a 74. Emailed them this morning, waiting to hear back.

Any other suggestions or links to online sites that have these parts at discount would be appreciated.

Regards, Ken