Honda CBR XX Forum banner

1 - 20 of 23 Posts

·
Registered
Joined
·
9 Posts
Discussion Starter #1
Hi, i recently brought a 1998 fuel injection bird.
It had been sitting in a garage for 10 months, started straight up and flew through MOT.
Only issue i noticed on the test ride was once warm it wouldn't tick over.
I solved this by raising the idel screw a couple of turns. Now bike runs ok.

Last year the last owner replaced the radiator and fan in france while on a tour. But he said it was a newer model one so it didnt connect up wire wise.
A seperate manual fan switch is now fitted.

Long post i know but bear with me ?

So to my problem.....
The bike smels like it runs realy rich, and my mpg is around 22mpg im lucky if i get 100 miles a tank.
No FI light is on (comes on and goes out on start up)

My first FI bike so i am a little newbish

Could the overfueling be caused by no temp readings (gague dont work either) and the FI thinking its still stone cold?

Or am i way off the mark?
 

·
Registered
Joined
·
469 Posts
1998 FI, must be an early model, I thought they officially FI started in 1999, or maybe its a carby that has been converted to FI.

Anyway, first check should be the FPR, fuel pressure regulator. Screws onto the right end of the fuel rail. If it fails, raw fuel is pulled thru the vacuum line into the engine and crankcase. To check, lift the back of the tank and support. Pull the small tube (vacuum tube) off the FPR and look and smell for raw fuel. Also, and most important, check the oil level. There maybe gas in the oil. If so, do not run bike like this.
 

·
Super Moderator
Joined
·
12,518 Posts
Second to Fizzy's recommendations.
Thirded.
fizzy said:
1998 FI, must be an early model, I thought they officially FI started in 1999, or maybe its a carby that has been converted to FI.
That is true. The first officially registered in the UK were April 1999 ..... my Daily Bird was one of the very first in the UK.
 

·
Registered
Joined
·
9 Posts
Discussion Starter #5
Was first reged 17th dec 98
It shocked me being FI as i also expected a 98 to be carb.
Clock has its fi light and fairing tail has its fi type decals.
Once i get my daughter's fazer of the ramp on thursday i can take a good look at her.
Oil level has been stable on the 300 miles i Have done so far with no fuel smell to oil.
Will try to take a peek under tank asap. Thanks.
So im definitely wide of the mark with no coolant temp sensor connected then?
 

·
Registered
Joined
·
469 Posts
No, not wide of the mark at all. Hook up all the sensors for sure, and check the wax unit too. Just that FPR is #1 on the list.

Edit. Might be a good idea to make sure its a true FI and not a bitsa. Not that there is anything wrong with that. There are a number of clues to look for. UK crowd will be better at this, as you are in UK. Try posting some pics
 

·
Registered
Joined
·
1,291 Posts
Hi, i recently brought a 1998 fuel injection bird.
It had been sitting in a garage for 10 months, started straight up and flew through MOT.
Only issue i noticed on the test ride was once warm it wouldn't tick over.
I solved this by raising the idel screw a couple of turns. Now bike runs ok.

Last year the last owner replaced the radiator and fan in france while on a tour. But he said it was a newer model one so it didnt connect up wire wise.
A seperate manual fan switch is now fitted.

Long post i know but bear with me ?

So to my problem.....
The bike smels like it runs realy rich, and my mpg is around 22mpg im lucky if i get 100 miles a tank.
No FI light is on (comes on and goes out on start up)

My first FI bike so i am a little newbish

Could the overfueling be caused by no temp readings (gague dont work either) and the FI thinking its still stone cold?

Or am i way off the mark?
Fi users temp sensor to plot fuel level so if it's disconnected may cause overfuelling. Don't confuse the fan sensor on rad with temp sensor in block though- early Fi had the two , later ecu controlled fan. This would explain why you had to up the tick over once she warned up and the fast idle(wax unit) closed, taking away the fast idle
 

·
Registered
Joined
·
9 Posts
Discussion Starter #8
So if it was infact a later radiator he fitted that would be why it couldnt be plugged in.
How could i sort this? Is it the fan and radiator i need to swap out? Or just 1.
 

·
Registered
Joined
·
7,801 Posts
The ECU uses a sensor on the back of the thermostat housing to check engine temp. The sensor on the radiator only controls the ground circuit on the fan. If you want the control back with sensor then you'll have to swap out the radiator if there isn't a place in the tank to mount it.
 

·
Registered
Joined
·
7,801 Posts
I'm sorry the side tank on the radiator. It'll be on the stator side if the bike. You'll see a sensor or sensor bung capped off of it has the capability for a sensor. You can see it through the vent duct on that side about half way up the back of the tank.
 

·
Registered
Joined
·
1,291 Posts
Your picture looks to be an fi- gold front discs and engine cases, you state she's got the fi decals and fi lamp in place of sidestand indicator. Because of the element of doubt with the year etc, may be worth checking frame no on headstock and engine number against log book just to make sure. Unlikely to be a modded carbie as lots to change to do this, hopefully is a very early Fi. The frame number you refer to may denote model year, this can be ahead of manufacture date- the Japs release a 99 model year in late 98, which then may be on a 98 plate.
 

·
Registered
Joined
·
145 Posts
Your picture looks to be an fi- gold front discs and engine cases, you state she's got the fi decals and fi lamp in place of sidestand indicator. Because of the element of doubt with the year etc, may be worth checking frame no on headstock and engine number against log book just to make sure. Unlikely to be a modded carbie as lots to change to do this, hopefully is a very early Fi. The frame number you refer to may denote model year, this can be ahead of manufacture date- the Japs release a 99 model year in late 98, which then may be on a 98 plate.

Yes this will be correct for your bike (it also has the fat cats in the muffler pipes - the carb bikes had skinny non cat pipes)..... I had a friend who was a dealer principal, he said Honda only built the BB in one proddy run for each year..... then they were shipped out around the world to importers warehouses, so the dates on the compliance plates and rego dates are not the build dates. So you look to have a 99 BB sold in Dec98.

BTW - you have a missing lower fairing cowl screw (down near the brake/ground).

Good luck sourcing the issue and getting it to run nicely again :thumb:.

Ps the other giveaway would be the fuel tank capacity should be 2ltr bigger than a carb model...... so yours should be (from memory) 23ltrs in the handbook(?) vs 21ltrs for a carb tank(?).

Take care removing the fairing panels..... there are tricky little hidden screws - maybe someone has a diagram to help..... it's easy once you've done one, but be careful first time round.
 

·
Registered
Joined
·
986 Posts
Yes this will be correct for your bike (it also has the fat cats in the muffler pipes - the carb bikes had skinny non cat pipes).
I believe that's the case here in Oz but I seem to remember reading/someone saying that the cats came out in ~01 in the UK and the US didn't get them at all AFAIK :idunno:
 

·
Registered
Joined
·
790 Posts
I believe that's the case here in Oz but I seem to remember reading/someone saying that the cats came out in ~01 in the UK and the US didn't get them at all AFAIK :idunno:
In the UK / Europe - cats were introduced with the Digital dash Bikes.

Carb bikes and analogue dash Fi bikes did not have cats.
 

·
Registered
Joined
·
9 Posts
Discussion Starter #20
Ok finally had time to lift the rear of tank.
Ran the fi fault memory and got

7 coolant temp sensor
9 air intake temp sensor
11 speed sensor

Also took off the vacume for the fpr
Bike hasnt been used for a few days but a definite smell of fuel and if you dab the metal pipe on the fpr with finger tip it drips fuel.

Oil level remains same
No fuel smell in oil.

Trying to find my meter to get readings from coolant sensor.
Not found the other 2 yet
 
1 - 20 of 23 Posts
Top