Update on the 1971 cb750

[shinyribs]

Bobber,the jets might fool you.I know my bike is still a 750,or 736 depending on how you look at it.I got 120 main jets and 42 slow jets in mine.The air cleaners and semi-open exhaust dictated it.It could probably use a touch more slow speed jet actually.The only way to know without disassembling the engine to measure it would be to use the fluid trick.Youre probably aware of that so i wont go into a bunch of detail there.

[Bobber0071]

Shiny,

I have no idea  of the fluid trick. What does it consist of.

[Piute]

Yeh!! I wont to hear about your trick and no treats

[shinyribs]

Get one cylinder on the lowest part of the stroke possible,all the way down.Fill that cylinder with fluid through the spark plug hole..Use a burrett that measure in cc's.Make a note of how cc's of fluid it take to fill it.Do it again with the piston all the way up.Make a note again of the amount needed.The difference between the "down" and  "up" volumes will be the cc volume of that cylinder.For what we ride,multiply by 4 and you have your actual cc volume of your engine.It's not too awfully easy and it is messy...but it is 100% accurate and FREE!I'd recommend using plain water and using a small hose on the end of a wet/dry vac to suck it all clean when you're done.Blow some compressed air in the plug hole to get the most vapors possible out then run it up to operating temp for a minute or so to help cook the rest of the water out. I  learned this when my grandpa used to run circle track and they would do this to verify the engine to make sure it was legal.

[Piute]

 Kinda thought that was the idea just never heard how done TANKS,
So you come from a family of runners huuummm

[shinyribs]

HAHA! Yes...'shine runners.Grandpa had a frame work built that covered the bed of an old Ford pickup.It was open underneath to hold the "cargo",but looked like he was hauling firewood when going down the road.He owned the local Sunoco station right at the only interstate on/off ramp in town.It was a happening place and he had the contract with Botetourt County to maintain all of their police cruisers.The cops would hang out and eat there during the day and often times played cards in the back room.They all knew what was up.Some of them were "customers".One night in the coooold winter there was a wreck because of the icy roads.Grandpa got stopped in the traffic of the accident.He had got the call to clean up the wreck and was headed to the station to get the wrecker.One of the officers working the accident saw him and recognized the truck."Jerry,it sure is cold out here.It would be nice to have a little something to warm me up".Grandpa went a got the wrecker and brought him back what he requested,too.Free of charge,of course.It wasn't a cop of coffee,either.When he got back with the wrecker and delivered the present the officer informed him that he had been hauling the same firewood for so long that it had all turned gray.Oops."You need help unloading it or something?" Grandpa thanked him for the advice and never let the wood turn gray again.LOL.Gotta love small town cops

[Piute]

[TOOLS1]

The two on the left are magnetos, and the one on the right is a distributor.
The real shortcoming with the Honda ignition is the coils. If, it is still using the stock coils with the RC distributor I would still use the iridium plugs.
TOOLS

[Piute]

 Right was why I posted the next pic to make more clear,of course if it has points it's not a Mag.But still need the (RC)housing for Mag..I think finding the worm gear is the hardest part,checking that next (new not used)...Piute...thought this was Diff.
LOW N SLOW

[Bobber0071]

Shiny,

Awsome story. Tools it does not have the stock coils. It has one indivaul coil like a car. I will post some pics of when I get a chance. It is a very cool setup. I have never seen one until this bike. I have google it and saw more Kaw's with it.   I think I am going to try the fliud trick one of these days when I get to feeling froggy.