What the f!@?! is wrong with my bike!? (Honda GB)

**sammcj** · 31st October 2009, 14:43

OK So I've made a few post on KB about some issues I've had with my 1986 Honda GB before, mainly to do with loss of power and bad idle / 'popping and stopping'.

So far, I've had 3 people look over it, mainly KG Motorcycles here in CHCH, no one can find the fault!

It randomly pop's and stops, you hear air making a popping noise somewhere and the RPM drops about 1000, this only occurs on idle however I do have a feeling there is some power missing from the engine.

It was a 500cc and was bored out to 600cc, it did pop and stop before the bore but it is worse now, probably due to the extra bore size.

KG has replaced:

-The carb
-The Ignition / CDI
-The generator
-Checked over wiring (but he's probably not very good at that!)
-Replaced muffler with a more free flowing one
-Valve clearances are good (thanks to help from T.W.R.!)
-Disconnected battery and checked charging rate
-Replaced coil under clutch cover (can't remember the name of it)
-Pretty sure there are no air leaks coming into carb
-Carb has been fully disassembled twice and checked over.
-Carb re-jetted
-Spark plug and gap is fine
-no airbox obstruction
-It's noticeably worse when it's hot.
-I have seen the indicators go to fast as if there was a blown bulb at times.

The head was leaking a bit of oil around the seal and KG put a new gasket on it yesterday, also did an oil change - after this it's running much worse today than it ever has.
KG motorcycles has spent countless hours trying to fix this and now doesn't want to see the bike again and to be honest I've lost all faith with them!

I've uploaded a video to youtube of it doing it REALLY badly (After the CHCH ACC ride today)

If you're the one that has the right solution for it I'll buy you some beers!

Here is the video:

http://www.youtube.com/watch_private...yfgYGywBApKg==

**nothingflash** · 31st October 2009, 15:07

I wouldn't know the difference between a piston and a piss take but I do wonder how many here will reply to say the first thing wrong with it is it's a Honda?

**bsasuper** · 31st October 2009, 15:12

Checked for any airbox obstruction?

**sammcj** · 31st October 2009, 15:14

Originally Posted by bsasuper

Checked for any airbox obstruction?

Thanks for the reply, yes I have, I've even removed the (new) airfilter and left it idling with the side cover off to test. Didn't make a difference.

**dino3310** · 31st October 2009, 15:27

..choke...

**sammcj** · 31st October 2009, 15:28

Originally Posted by dino3310

..choke...

Idles OK with the choke on, but it does if you hold the throttle on too!

**sammcj** · 31st October 2009, 15:33

It's noticeably worse when it's hot.
and I have seen the indicators go to fast as if there was a blown bulb at times.

**dino3310** · 31st October 2009, 15:37

i had a 650 that was poppin and stoppin all the time speacially while engine breaking or backing of fast from the revs she'd just stop, turned out the choke was slightly jammed on, only got dail up so cant watch youtube to compare, hope you get it sorted mate

**dino3310** · 31st October 2009, 15:40

Originally Posted by sammcj2000

It's noticeably worse when it's hot.
and I have seen the indicators go to fast as if there was a blown bulb at times.

sounds like the leckys mate, which i know F all about.
sounds like these KG chaps have got there heads up there .......,

**sammcj** · 31st October 2009, 15:43

Originally Posted by dino3310

i had a 650 that was poppin and stoppin all the time speacially while engine breaking or backing of fast from the revs she'd just stop, turned out the choke was slightly jammed on, only got dail up so cant watch youtube to compare, hope you get it sorted mate

hmm interesting...

how do you go about adjusting the choke, do you remove the grip etc...?

I just pulled the sleeve off where the choke cable enters the carb, the cable is loose enough that I can pull on it and see the metal end to the casing...

(hope you can understand what I mean... could upload photo)

**sammcj** · 31st October 2009, 15:50

I can push the metal end of the cable down into where it sits in the carb but how does it stay there? surely the rubber casing can't keep it in tight?

**sammcj** · 31st October 2009, 16:07

hmmm this choke thing could be a go-er. I just made sure it was really securly seated at the carb end, did run fine BUT that could be because it's not hot enough to fault again.

On the chch ACC ride today I was constantly battling to keep the bugger running at the lights, I find I can combat the 'pop' by giving it a little gass and it keep running, prob is when it's popping almost constantly on idle.

Hmmm... choke.... hmmm...

**R1madness** · 31st October 2009, 16:23

Ring my shop on monday, (number at the bottom) talk to Roger. Book it in and it will come out fixed.

**sammcj** · 31st October 2009, 16:26

Originally Posted by R1madness

Ring my shop on monday, (number at the bottom) talk to Roger. Book it in and it will come out fixed.

Thanks, I'm a bit broke at the moment after taking it to KG to get the head retentioned which resulted in a head bolt snapping ($350 later), I'll look into this if I don't have it resolved soon.

**laserracer** · 31st October 2009, 16:27

is the choke cable mybe seized inside the outer ??we just had a problem with a seized hot start lever that had the same symptoms it also looked very much like your choke cable .. have you tried undoing the plastic nut and trying to free the cable ??