Custom Fighters - Custom Streetfighter Motorcycle Forum banner
1 - 8 of 8 Posts

·
Registered
Joined
·
22 Posts
Discussion Starter · #1 ·
I stripped down an 82 cb900f this past year and made a good project of it. switched from a 4 to 2 exhaust to a 4 to 1 with a straightpipe exhaust (small baffle in the tip though) and installed pod filters on the carbs. I started it up for the first time and it looks like i need some carb tuning done!

Ive never done carb tuning, and i really just want to get this bike road ready. Does anyone know of a specialist in michigan, preferably in livingston country or around it? or even if anyone on here knows what they're doing and would like some extra cash i'd be glad to work out a deal!

pics for your pleasure:
 

Attachments

·
Premium Member
Joined
·
5,674 Posts
+1 on pods, Hondas in general hate them, I don`t have first hand experience with any CB:s but I know all CBR:s run best with stock filters, even a K&N pad can mess em up, having pods and getting it to run well... specially with a modded exhaust... better go fill a lottery ticket...
 

·
Registered
Joined
·
22 Posts
Discussion Starter · #4 ·
Click on the link in my sig for the build thread on my '80 CB750F (last several pages in particular). It has all the information on DOHC CB's with pods and masochism you could ever want.


Sorry, but pods on these bikes suuuuuck.Well earned reputation.
thanks for the input, i'll check out those pages tonight. i've got 0 carb tuning experience though, im not sure if i want to dick around with mine. i'll end up waasting more time that i'd like for something that might cost something cheap (no clear idea how much shops charge for carb tuning)

+1 on pods, Hondas in general hate them, I don`t have first hand experience with any CB:s but I know all CBR:s run best with stock filters, even a K&N pad can mess em up, having pods and getting it to run well... specially with a modded exhaust... better go fill a lottery ticket...
last time i did that i won $1,000,000! luck will certainly be with me!
 

·
Premium Member
Joined
·
5,674 Posts
last time i did that i won $1,000,000! luck will certainly be with me!
Then what U doing with an 82 CB?!

The carb tuning itself is not hard at all but to do it you`ll need a gauge with enough dials for all the carbs. You can make a gauge yourself but if you gotta buy all the parts it`s not that more expensive to buy a ready gauge and be sure it shows correct readings.
 
  • Like
Reactions: RedLiner

·
Registered
Joined
·
388 Posts
To do it right would require multiple dyno runs. Maybe several runs just to get the mains correct.

Then more runs to dial in the midrange, which will now have a massive flat spot from your 4 into 1, probably around 5k.

After all that you will go to start it in the fall and find out it is too lean to run below 40 degrees.

So, maybe a grand to have someone else do it. You will become an expert at pulling and installing your carbs. And changing fouled spark plugs.

Depending on the shop they might just put a kit in there. That will absolutely NOT be the right tuning for your bike.

The reason I say dyno runs is because your butt dyno isn't sensitive enough to tell you what is better. Also the neighbors will be pissed at you for screaming up that hill at redline in second 10x a day!

Remember that smoother is faster. That is why cv carbs took over from flatslides.

Especially on a pig like the cb900 you don't want to have the engine hiccup when you are leaned way over in a corner or the engine cases will deck out and lever your back wheel up into the air!

So, go for it!:rock:


Jon
 

·
Registered
Joined
·
22 Posts
Discussion Starter · #7 ·
little update guys, i contacted the guy whose build i was following for this bike and found that he got new cr-31 carbs for this bike, and that seemed to solve his problem! $700 soon and i'll get some brand new carbs and get this sucker on the road!
 
1 - 8 of 8 Posts
Top