Another "My bikes got a problem" Thread

[FilthyLuka]

http://www.motorcyclecarbs.com/MIKUN..._P9801C776.cfm

[Kickaha]

http://www.motorcyclecarbs.com/MIKUN..._P9801C776.cfm

Bren_chch has some FCR flatslides coming in for the FXR150 as well and he has the race cdi and cams for them

[EJK]

hmmmmm

We'll see how we go...

First things first, garage. I'll contact Mr. Pumba

[motorbyclist]

Edit: Wait, CDI is a computer thing right? How can it get damaged?

Edit: Airbox can be replaced with an air filter too?

cdi is mechanical spark timing, driven by the camshaft (cam driven ignition)

yes, higher flow intake on samll engines makes a very noticable improvement too

hmmmmm

We'll see how we go...

First things first, garage. I'll contact Mr. Pumba

if that doesn't work i've got a shed, ute and trailer... plus i'm less than 7 minutes from frosty's

[Mike748]

Doh! I'm disappointed I didn't spot this thread earlier, I would definately have dropped by to help on the FXR.
So what's left to be done? sounds like it's getting the works and will end up better than new.

[EJK]

You are not too late sir!

Things needs to be done

1. New Garage
2. CDI test - CDI from another FXR
3. Replace tank - Rusted badly
4. Replace Ignition Engine Clutch (Is that what people call it?)
5. Thats all folks!
6. And we'll see how we go

Garage! Garage! I need garage!

P.S. Hey Andrew, can you help me out? Since you are closer to FROSTY's and you also have a FXR, I could (might) save some time

Well, thanks for the offer Mr. Pumba




Time is running out: Due date 16th April

[motorbyclist]

well seeing as i've got an fxr there's a CDI you could test right there

[EJK]

GIJOE is going to pick up the bike on Sunday around 4pm. Are you avaliable?

[motorbyclist]

where's he taking it? i should be free, but can't promise as yet. 5pm suits better

[Mike748]

You are not too late sir!

Things needs to be done

1. New Garage
2. CDI test - CDI from another FXR
3. Replace tank - Rusted badly
4. Replace Ignition Engine Clutch (Is that what people call it?)
5. Thats all folks!
6. And we'll see how we go

Garage! Garage! I need garage!

P.S. Hey Andrew, can you help me out? Since you are closer to FROSTY's and you also have a FXR, I could (might) save some time

Well, thanks for the offer Mr. Pumba




Time is running out: Due date 16th April

Can't help with Garage space but happy to help get you back on the road, if I can.

[motorbyclist]

garage space sorted, he's bringing it round to my shed


expect a whole lot of cheap fxr parts on trademe by monday morning

[FROSTY:Me]

please guys re4alise at 5.00pm on a sunday --Im gone home

[motorbyclist]

right, bike came around and we had a look-see

first problem is my dad and brother had all my tools out on an offroad ride, but we still managed to find the CDI is all sweet by swapping with my fxr. once the battery starts going flat the digital display has a little spaz out at due to low voltages while on the starter motor; normal, expected and not something to be worried about.

pulled out the air filter out and it was saturated with petrol, basically choking the engine. gave it a clean and the glue all fell apart, and the foam was starting to degrade too, becoming crumbly.

then tools arrived and we got into it. turns out the neighbour had one of my spark plug sockets, namely the only one to fit the fxr. cleaned up the plug, no spark. put a new plug in, no spark. noticed the CDI was unplugged, plugged the CDI back in, and suddenly we got big fat sparks

tried the kickstart and compression seems good compared to my running fxr.

pulled the battery out of the bulldozer and had a good run on the engine. i reckon the starter clutch is a bit dodgy, but that aside we could get the bike to run with a bit of skill after we removed the airbox. give it too much gas/revs and it stalled. it was misfiring a bit too, running very rich. when it stalled it often squirted gas back out the carby. also noticed the black slide/diaphram thing wasn't moving at all, explaining the rich fuel mix. took the lid off the carb and turns out the rubber diaphram wasn't properly seated, and there was silicone around where someone had tried to seal it. the rubber was a bit deformed

prior experience tells me petrol eats silicone and this was no exception. rubbed the remaining silicone off the rubber. frank (gijoe? - i'm hopeless with names) reckoned it would return to it's normal shape, so we left it in a safe and clean spot to dry out.

I noticed the black slide thingy was pretty worn on the sides, but at 50,000kms I'm not entirely surprised.

So, in summary:
EJ is buying a new air filter, or if that's ridiculously overpriced some foam to make a new one out of.
The bike DOES run, but is running VERY rich. I'm confident the internals are ok despite the petrol instead of oil incident.
The problem is most certainly entirely based around the carburetor.
Electrics and electronics seem to be good.
Will look at the fxr next time they're over.
"Imma chargin mah battery"; it seems fine, just flat.

plus EJ also needs a new rear tyre, the current one is both the wrong size and worn very square with no tread down the middle

[Mike748]

I'm a bit hard on some of my machines and a trial and error garage fixer so take that into consideration when reading this.
I'm also not familiar with the bike and I could be way off the mark but this is what I'd do next:

Go for the foam homemade replacement (or whichever is cheaper), unless he's riding metal roads it doesn't need to be hi tech, and I wouldn't use anything heavier in oil than a 2stroke mix to wet it (leave it dry even), then let the fuel dry off.

Good luck with the drying of the rubber, if it resizes ok put it back.

When your battery is ok fire it up, if it looks like it's still running rich count n record the turns on the fuel mix screw as you wind it right in. (reference point)

Crank it over to make sure it's dry of fuel, if it's flooded it'll try and fire as it clears.

Wind mix out 2.5 turns n crank it again it should fire but not run as it's too lean, crank and increase fuel mix until it idles.

This all assumes that the carb settings are your only issue, I've found that when things start playing up people love to "Tune things up" and a rich mix with lot's of throttle/idle can hide all sorts of minor maintenance problems.

Good luck.

[Ixion]

Bit of foam from para rubber will sort the air filter. Cheapa s chips

The diaphragm slide not moving will certainly mess up carburation(though usually would make it leaner, bu tit may not be going down - check that, it may be stuck in the UP position)

Sort the carb, and it'll be as good as new