Wife Bike - CB100
- Thread starter TurdFurguson
- Start date
Yup, ive ordered some colored heat shrink to use on the wires, need it to get here so I can finalize up my wiring.
Well, the bike is back together, but I think I bit off more than I can chew with this simple little 100. I changed to many things at one time and now its nearly impossible for me to troubleshoot.
I am having some sort of charging issue because when I unplugg the battery it starts to run VERY poorly.
It fires up great, idles like a champ, runs great at <1/4 throttle and low to mid range RPMs. Anything more and it starts to go 'PAT PAT PAT' and wants to die till i back it back down. No matter the RPM if i open up the throttle above 1/4 it just wants to die.
Troubleshooting steps
[list type=decimal]
[*]Checked float height, its at 23.5mm book says 24mm
[*]Checked timing, advanced it a little retarded it a little
[*]Moved needle a notch richer
[*]Changed jets from 110 (stock), to 115, 120, and 125
[*]Made sure battery was fully charged
[/list]
Nothing i have done has made ANY difference on the issue except completely fowl up a plug
I am having some sort of charging issue because when I unplugg the battery it starts to run VERY poorly.
It fires up great, idles like a champ, runs great at <1/4 throttle and low to mid range RPMs. Anything more and it starts to go 'PAT PAT PAT' and wants to die till i back it back down. No matter the RPM if i open up the throttle above 1/4 it just wants to die.
Troubleshooting steps
[list type=decimal]
[*]Checked float height, its at 23.5mm book says 24mm
[*]Checked timing, advanced it a little retarded it a little
[*]Moved needle a notch richer
[*]Changed jets from 110 (stock), to 115, 120, and 125
[*]Made sure battery was fully charged
[/list]
Nothing i have done has made ANY difference on the issue except completely fowl up a plug
Re: Wife Bike - CB100
Check valve lash, they are super finicky about that. Check charging for sure. They won't run for shit without the battery. Mine runs well with a cb350 stator and a capacitor. Timing isn't too terribly sensitive. Its gotta be something simple with good compression readings. Speaking of which, what are they?
Check valve lash, they are super finicky about that. Check charging for sure. They won't run for shit without the battery. Mine runs well with a cb350 stator and a capacitor. Timing isn't too terribly sensitive. Its gotta be something simple with good compression readings. Speaking of which, what are they?
sxecafe said:
Petcock was completely rebuilt, it flows great. I took the bottom of the bowl off and made sure that gass was getting throught he carb and it seems to. The plugs were very black, but that was when I was pushing the really big jets, its not as bad now that I have toned it back to 115. I havent tried going down lower than 110, I could give it a try, but the mains shouldn't make a difference until 2/3 afaik.
Kanticoy said:
Not sure what you mean by valve lash. I do think I have some sort of charging issue, but im rocking a battery so I dont THINK that should be my immediate issue but I could be wrong. Im running the 360 stator and a reg/rec combo. I honestly havent checked compression, but its got a rebuild head, new piston, new rings, new cylinder, and the valves are set correctly now (they were not correct before and was the issue of not starting at all). All else fails i'll bring it down to alabama and maybe we can fix it on thursday
Thoughts on the exhaust being to restrictive? Running a VStack with the stock exhaust could be causing to much back pressure preventing it from running at higher RPM and High throttle?
Spent a few more hours going over the bike, I believe that I found the issue. It seems that it was a fuel issue... For some reason air isn't getting in through the fuel cap so the tank is creating a vaccume and it eventually ran out of fuel. Makes alot of since, but I cant figure out why the cap isn't working correctly. Not exactly sure how its suppose to work though either seems like it makes a tight seal, so im not sure where it would suck air from. I ran it with the cap open and it was running pretty strong, still some sesitation at WOT but im guessing I just need to do some plug tests to see if its rick or lean at WOT.
Well, here are some pics with how it sits. I have three weeks to get paint on it. and next weekend is already shot.. running out of time for it to be ready.
Well, here are some pics with how it sits. I have three weeks to get paint on it. and next weekend is already shot.. running out of time for it to be ready.
Big R
Heaven is so far away.
There should be a small hole on the underside of the cap that vents the tank (allows air in to replace the gas going to the carb). Try spraying wd40 with a little carb cleaner in there to break up any dirt - but don't blast it with an air compressor. That much pressure can pop the whole assembly apart (proven by myself and others I'm sure).
I thought the 100/125's ran better with the stock air box than pods? So sticking with stock jet sizes might be best.
And I do still have your airbox if you want it.........
I thought the 100/125's ran better with the stock air box than pods? So sticking with stock jet sizes might be best.
And I do still have your airbox if you want it.........
Big Rich said:
Yeah there is a hole down there. I hit it with an air compressor and blew out some gunk but it didn't make a difference. Hit it up with some PBBlaster then some brake cleaner and it didn't do anything either... even tried banging it on the ground out of frustration, didn't do anything. Not sure whats wrong with it. It makes a complete seal right at the main part of the cap, with the hole in the center, inside the seal.. so im still not sure how air gets into the tank, unless im missing something.
I buttoned up the wiring in the headlight bucket yesterday and rode it around the neighborhood a little. Runs good now but there is a random miss here and there. Might just be an issue with the VStack. I'll tinker with jetting as time goes on to see if I can work it out.
Here is a video of firing it up revs pretty nice now
http://www.youtube.com/watch?v=XbjBABmtjQc
Big Rich said:
Here is a pic of the cap. Your right about the tabs. when you screw it on it pull the tabs when hold the cap on. You can see however how the seal itself works. How can air get into the tank with a seal like that?
Big R
Heaven is so far away.
Ah, I thought it was a flip cap, not a twist cap.
While it's possible to take that apart, it's next to impossible to get it back together just right. I would pull the rubber gasket out and soak it in some different cleaners. Maybe try running hot water through the center hole to flush it out?
While it's possible to take that apart, it's next to impossible to get it back together just right. I would pull the rubber gasket out and soak it in some different cleaners. Maybe try running hot water through the center hole to flush it out?
How does air get in here? Its a sealed system from what I can see..
Big Rich said:
It cant vent above the tabs, because thats still in the tank so its still closed system. However, thats how it seems to work. I cant find any way that it could get around the seal and outside the bike. I'll try posting up in the help section and see if anyone has any ideas. Maybe its not the correct cap for the bike.
eyhonda said:
I wasn't able to see any sort of 'pinhole'. I had the tank upside down with CRL in it for about a day and it didn't leak so im guessing at this point that this hole is corroded/rusted at this point. I'll dig around a little more with a small wire and see if i cant uncover it when I get back to the house. Likely am going to need a new cap, dont seem to be to expensive and will look nice anyways.. Just as long as I can get one before barber.
Little sneak peak
