Contact Overland Solutions for all your custom modifications and setup for overland travel.               Discover the extraordinary with Compass Expeditions.

Go Back   The HUBB > Technical, Bike forums > Honda Tech
CBX 250: Poor performance at high speed CBX 250: Poor performance at high speed
Register FAQ Calendar Search Today's Posts Mark Forums Read

Honda Tech Honda Tech Forum - For Questions specific and of interest to Honda riders only. Questions comparing which bike is best etc go in the "Which Bike" forum.
With more than 58 destinations worldwide, Edelweiss Bike Travel is Number 1 in guided motorcycle tours!
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 19 Jan 2009
Registered Users
New on the HUBB
  
Join Date: Jan 2009
Location: Pretoria, South Africa
Posts: 1
CBX 250: Poor performance at high speed
My Honda CBX250 Twister which has only done 1500 miles has developed quite a bad surge in power, runs quite erratically at anything over 7000rpm and it is almost impossible to get it to exceed 70 mph. It feels almost as though it experiences fuel starvation and I have checked the fuel flow to the carb, without any success. I would like to try and fix it myself, but have avoided taking the carb off and opening it to for instance, interfere with the float level setting. The idle mixture screw is all but inaccessible, but adjusting it would only affect the idling setting, not so? I'm assuming that it is a fuel problem and it is out of it's warranty, being a 2006 model. Can anyone please assist with advice as I would like to tackle and attempt to solve the problem myself before taking it to a professional workshop.
Reply With Quote
  #2  
Old 19 Jan 2009
Registered Users
Veteran HUBBer
  
Join Date: Apr 2005
Location: Oxford UK
Posts: 683
Quote:
Originally Posted by Bokbal View Post
opening it to for instance, interfere with the float level setting. The idle mixture screw is all but inaccessible, but adjusting it would only affect the idling setting, not so?
Remember the old saying that carburettor is French for leave it alone. I'd be surprised if a virtually new Japanese bike was delivered with the wrong float level and the idle mix screw is unlikely to be connected with the symptoms you describe.
Restricted fuel flow into the carb would be my first guess. Has it just started misfiring recently or has it been doing it from new? Does it start /idle ok and run well in the mid range but just misfire as you use more throttle? How do the plugs look?
Reply With Quote
  #3  
Old 19 Jan 2009
Contributing Member
Veteran HUBBer
  
Join Date: Feb 2004
Location: Barcelona/Edinburgh
Posts: 738
I had a similar-ish thing, though it would also be erratic at idle. turned out to be a split air hose. if you feel/listen around the airbox/hoses you may hear a hissing if there's air being sucked in.
Reply With Quote
Reply

« Previous Thread | Next Thread »

Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
Display Modes
Linear Mode Linear Mode

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
High(er)-speed helmet impact tests? pecha72 Equipment Reviews 0 30 Sep 2008 10:50
Xt 600 Performance Jaeg Yamaha Tech 10 15 Aug 2008 19:59
poor performance from TLC H60 moggy 1968 4WD Overland Tech 4 19 Sep 2006 07:47
TTR 600 Performance bolla Yamaha Tech 3 3 Jun 2005 02:52
High Speed Engine Cut Out cexley Yamaha Tech 3 15 Mar 2001 16:38


All times are GMT +1. The time now is 04:34.

Contact Us - Horizons Unlimited Motorcycle Travellers Website - Archive - Privacy Statement - Top