Welcome back to us :/ Our hosts data center was down for the entire day.
MotoHouston.com MotoHouston.com
Register Members List Member Map Media Calendar Garage Forum Home Mark Forums Read

Go Back   MotoHouston.com > General Discussion > Dirtbikes, Mini's, ATV's.....
Forgot info?

Welcome to MotoHouston.com! You are currently viewing our forums as a guest which gives you limited access to the community. By joining our free community you will have access to great discounts from our sponsors, the ability to post topics, communicate privately with other members, respond to polls, upload content, free email, classifieds, and access many other special features. Registration is fast, simple and absolutely free, join our community!

Register Today!

If you have any problems with the registration process or your account login, please contact us.


FREE MH Decals by MAIL!

Advertisement

Reply
Share This Thread: 
Subscribe to this Thread Thread Tools
Old 03-26-2009, 10:12 AM   #1
Hardknock
Senior Member
 
Hardknock's Avatar
 
Join Date: Oct 2008
Location: League City
Feedback Rating: (0)
Posts: 157

Experience: 4 years

Bike(s):
200cc Hardknock Bobber









xr125 boggin

Thought maybe some of you pros could help me out. I have a hi-bird 125cc which is basically a replica of the honda xr 125. Well during higher throttle through each gear it tends to sputter and bog. I can not fix it for the life of me. I have changed spark plug, tried several carbs, cleaned jets, etc. Im flat out of ideas. Its my friends bike and he said that the valves were adjusted. Any ideas? Thanks for any help in advance.
Hardknock is offline   Reply With Quote
Advertisement
Old 03-26-2009, 10:19 AM   #2
hotnanas
i rock knobbies
 
hotnanas's Avatar
 
Join Date: Sep 2005
Feedback Rating: (4)
Posts: 8,881

Experience: 10+ years











jetting?
hotnanas is offline   Reply With Quote
Old 03-26-2009, 10:19 AM   #3
jetcycles
DRIVEN BY ANGER
 
jetcycles's Avatar
 
Join Date: Nov 2005
Location: ShoreAcres
Feedback Rating: (14)
Posts: 12,032

Experience: 10+ years

Bike(s):
1950 Chevy Deluxe
1980 Honda CT70
1987 Kawasaki 650SX
1996 Honda Z50



what sort of exhaust and air filter are on the bike? is this a new problem with the bike? what does the old plug look like?
__________________
I understand the consequences of my actions prior to engaging in those actions. . .there are certain situations in life where the risk is totally worth the reward.
jetcycles is online now   Reply With Quote
Old 03-26-2009, 10:25 AM   #4
Hardknock
Senior Member
 
Hardknock's Avatar
 
Join Date: Oct 2008
Location: League City
Feedback Rating: (0)
Posts: 157

Experience: 4 years

Bike(s):
200cc Hardknock Bobber









you guys are quick. Im at work but I can check the plug later today. As for the airfilter is just a standard cone filter, I don't know the specific brand name and the exhaust is custom. Its one of our hardknocks the 125 model. This bike is brand new and only has 100 miles on it. Its been doing this ever since the guy put it together.
Hardknock is offline   Reply With Quote
Old 03-26-2009, 10:29 AM   #5
klassik
Senior Member
 
klassik's Avatar
 
Join Date: Feb 2008
Location: Rosharon Tx
Feedback Rating: (2)
Posts: 7,984

Experience: 10+ years

Bike(s):
929
rnz450








its a ground issue. gauranteed. i would almost put money on it.
__________________
www.teamstunters.com
klassik is offline   Reply With Quote
Old 03-26-2009, 10:31 AM   #6
Hardknock
Senior Member
 
Hardknock's Avatar
 
Join Date: Oct 2008
Location: League City
Feedback Rating: (0)
Posts: 157

Experience: 4 years

Bike(s):
200cc Hardknock Bobber









Ya think so? High vibrations causing it? I'll check on that. Thanks
Hardknock is offline   Reply With Quote
Old 03-26-2009, 10:34 AM   #7
klassik
Senior Member
 
klassik's Avatar
 
Join Date: Feb 2008
Location: Rosharon Tx
Feedback Rating: (2)
Posts: 7,984

Experience: 10+ years

Bike(s):
929
rnz450








i had the same problem. went through everything to finally see a bad ground. or the rev box might be going out. hondas are bad about that
__________________
www.teamstunters.com
klassik is offline   Reply With Quote
Old 03-26-2009, 10:41 AM   #8
Hardknock
Senior Member
 
Hardknock's Avatar
 
Join Date: Oct 2008
Location: League City
Feedback Rating: (0)
Posts: 157

Experience: 4 years

Bike(s):
200cc Hardknock Bobber









Cool well I'll check it out this evening and let you guys know what I find I did change the cdi too. Thanks you guys rock.
Hardknock is offline   Reply With Quote
Old 03-26-2009, 10:43 AM   #9
jetcycles
DRIVEN BY ANGER
 
jetcycles's Avatar
 
Join Date: Nov 2005
Location: ShoreAcres
Feedback Rating: (14)
Posts: 12,032

Experience: 10+ years

Bike(s):
1950 Chevy Deluxe
1980 Honda CT70
1987 Kawasaki 650SX
1996 Honda Z50



another thought could be a small volume air leak that develops under higher vacuum created during high rpm runs. . .try spraying starting fluid near the carb boot(not into the air filter) and listen for the RPM's to increase
__________________
I understand the consequences of my actions prior to engaging in those actions. . .there are certain situations in life where the risk is totally worth the reward.
jetcycles is online now   Reply With Quote
Old 03-26-2009, 09:47 PM   #10
cobrakiller02
Senior Member
 
cobrakiller02's Avatar
 
Join Date: Jan 2009
Location: katy
Feedback Rating: (1)
Posts: 781

Experience: 10+ years
Trackdays: 10+

Bike(s):
To many to list









if you had a intake leak the revs would drop back down slow.
cobrakiller02 is offline   Reply With Quote
Old 03-27-2009, 08:48 AM   #11
jetcycles
DRIVEN BY ANGER
 
jetcycles's Avatar
 
Join Date: Nov 2005
Location: ShoreAcres
Feedback Rating: (14)
Posts: 12,032

Experience: 10+ years

Bike(s):
1950 Chevy Deluxe
1980 Honda CT70
1987 Kawasaki 650SX
1996 Honda Z50



any updates?
__________________
I understand the consequences of my actions prior to engaging in those actions. . .there are certain situations in life where the risk is totally worth the reward.
jetcycles is online now   Reply With Quote
Old 03-27-2009, 06:09 PM   #12
Hardknock
Senior Member
 
Hardknock's Avatar
 
Join Date: Oct 2008
Location: League City
Feedback Rating: (0)
Posts: 157

Experience: 4 years

Bike(s):
200cc Hardknock Bobber









Well I put the new mikuni carb on and had to use a swival adapter to mount it and it ended up causing a vacuum leak bewteen the intake and the motor. So I took the stock intake cut it, turned it and rewelded it. Well the carb works good now but the sputtering and bogging is still there. So not a carb problem. Checked the coil seems fine. Checked the ground. Seems fine. I have my buddy that went to MMI coming over on sunday so hopefully he can check the timing and the valves. This is a freakin nightmare. I wish they had a MMI here in Houston I would be all over that ish.
Hardknock is offline   Reply With Quote
Old 03-27-2009, 06:12 PM   #13
klassik
Senior Member
 
klassik's Avatar
 
Join Date: Feb 2008
Location: Rosharon Tx
Feedback Rating: (2)
Posts: 7,984

Experience: 10+ years

Bike(s):
929
rnz450








are you getting plenty of fuel? maybe bad gas? does it have a inlin filter that might be stopped up? how long has it sat with crappy fuel in it? pull of spark plug and see what color it is.
__________________
www.teamstunters.com
klassik is offline   Reply With Quote
Old 03-27-2009, 06:28 PM   #14
Hardknock
Senior Member
 
Hardknock's Avatar
 
Join Date: Oct 2008
Location: League City
Feedback Rating: (0)
Posts: 157

Experience: 4 years

Bike(s):
200cc Hardknock Bobber









Its brand new bike, with brand new fuel, and yes in line filter. Gas flow seems fine. Plug is dry black and the tip seems to be no residue or black.
Hardknock is offline   Reply With Quote
Old 03-27-2009, 06:30 PM   #15
klassik
Senior Member
 
klassik's Avatar
 
Join Date: Feb 2008
Location: Rosharon Tx
Feedback Rating: (2)
Posts: 7,984

Experience: 10+ years

Bike(s):
929
rnz450








how new? off the showroom? take it back and say hey wth
__________________
www.teamstunters.com
klassik is offline   Reply With Quote
Old 03-27-2009, 06:35 PM   #16
Hardknock
Senior Member
 
Hardknock's Avatar
 
Join Date: Oct 2008
Location: League City
Feedback Rating: (0)
Posts: 157

Experience: 4 years

Bike(s):
200cc Hardknock Bobber









Haha. It has 100 miles on it. Its a kit bike. You can't take it back. That's why im trying to help the guy out. I guess we will see what my mechanic finds. Thanks for all of your help. I will let yall know what I find out on sunday.
Hardknock is offline   Reply With Quote
Old 03-29-2009, 11:36 PM   #17
Hardknock
Senior Member
 
Hardknock's Avatar
 
Join Date: Oct 2008
Location: League City
Feedback Rating: (0)
Posts: 157

Experience: 4 years

Bike(s):
200cc Hardknock Bobber









Well my buddy came by and tuned it best he could. Now it just bogs a little at the end of each gear instead of in the middle. So I guess thats all I can do for the guy. Thanks for all of your help.
Hardknock is offline   Reply With Quote
Old 03-30-2009, 09:20 AM   #18
cobrakiller02
Senior Member
 
cobrakiller02's Avatar
 
Join Date: Jan 2009
Location: katy
Feedback Rating: (1)
Posts: 781

Experience: 10+ years
Trackdays: 10+

Bike(s):
To many to list









go a little bigger on the main jet
cobrakiller02 is offline   Reply With Quote
Reply


Thread Tools

Advertisement


All times are GMT -5. The time now is 09:46 AM.


MotoHouston.com is not responsible for the content posted by users.
Privacy Policy