FXR probs

[Antallica]

Hey dudes, it's time I put the problem out there instead of ignoring it.

For anyone who's ridden the FXR it has the "boost" (and I use that term loosely ) at 8.5k right? Well what mine is doing is acting as if it's being starved a bit and the bike jerks (similar to when the bike is running out of gas) and the boost doesn't kick in. It's as if the bike is not warmed up enough but it's hot as anything.

Funny thing is that if I have used the bike all morning and leave it for an hour or so after use and try it again, the bike almost acts sweet as with the boost kicking in.

I've got a new sparkie and the oil is fresh enough, I'm sure the oil isn't doing it. I really want to get an idea on what it might be so I don't put it into a shop and have them charge me a grand for something I could have done myself.

[Antallica]

I've suspected my clutch discs to be slipping or something but it seems fine anywhere under 8.5k. I suspect Clutch or Fuel lines.

My mate seems to be having a similar problem, we are both around the 15,000km mark. Hope it's not something these bikes will become known for.

[jrandom]

Had exactly the same situation. The power peak just wasn't there some days. Didn't experience any jerky engine response though, that sounds a bit funny.

Does your bike still have the stock Malaysian factory carb jet and settings? The problem went away for me after Colemans rejetted and tuned my FXR and I started running it on Mobil 98 exclusively (the power also smoothed out a little and noticeably increased, with a slightly softer peak arriving around 10K instead of 8.5K). Last service, the nice chappie at the workshop who I can never remember the name of reckoned it'd be making about 28hp at the wheel which is several ponies over stock. I'll definitely put my FXR on the dyno before I flick it, just out of curiosity, like. Couple of times I've pulled away beside other FXRs around town and in spite of me displacing about 1.5 x the average 150 rider my bike always heads off in front with both of us gunning it.

Call the guys at Colemans and have a chat. The FXR is a bike worth twiddling with, it's not going to blow up on you.

[Antallica]

Well perhaps I'll organise a trip down to Auckland and see them. Dunno what I'll do when they have it though.

[jrandom]

Well perhaps I'll organise a trip down to Auckland and see them. Dunno what I'll do when they have it though.

er, you don't have your full license yet, do you? If you do, Colemans usually have plenty of loaner bikes going. They don't do restricted-license lenders though.

Otherwise, if you're going to get them to do the work, they'll only need the bike for a few hours. Book in (you'll probably need to wait 2-4 weeks), take the day off, ride down in the morning, turn up at the shop and go for a walk into town or something while they fix it up for ya. No worries.

[jrandom]

Oh yeah, and I know all the blah blah about not needing higher octane and all that, but I'm pretty sure about that Mobil 98. The power definitely comes on better when I'm running the FXR on it. Start using it after the retune.

[madandy]

98 makes my bike run heaps smoother than 91! diff. between 98 & 96 (on my bike) is little though.

[Eddieb]

My bike feels a bit smoother and more responsive on it as well.

[Antallica]

Yeah I'll probably book it in, will get in touch with them sometime. Gave it another birthday today (oil change), just to make sure that was done right.

Cheers for the advice man
I've been running it on BP '96 ever since I got it.

[Andrew]

Sounds like your bike could be running too rich when you open it up to that rev range.

[Antallica]

Yeah it sounds like it's getting too much of one or the other. I'll make sure that fuel hose is clear though.

[750Y]

Sounds like your bike could be running too rich when you open it up to that rev range.

could be the needle is wearing. although I haven't had the pleasure of pulling carbs apart for a few years now(Fuel injection is pretty nice). I'd be thinking about fuel &/or spark as your source of problems. You can test by running a timing light on the lead and revving it through the range and watching to see if the firing pattern scatters at higher revs which lets you know the electricals are working ok or not(the light should just blink faster but not scatter/stutter). probably pay to do it when the bikes hot and also when the bikes just been warmed up to rule out changes in conditions.You won't of course want to do it when the bikes cold and you only need to go through the problem point(8.5-10rpms) and not for a sustained time as there's no load on the engine when it's sitting. My suspicion is tho that the carb/s will need to be serviced.
You could also test to see if it's to do with it being rich(hence the needle wearing comment). if it has a choke(not fast idle) then warm it up to running temp from cold & pull the choke on, then go for a rip round & see if it does it, if it plays up then back off the choke a quarter & check for any change, then another quarter etc. until it's off. If it gets better while you're reducing the choke then it's to do with fuel and being too rich. pick an average weather day to try this & try to keep the temperature down while You're doing that test so that you don't get it hot again and run into the usual problems thereby masking the results of your test.
let us know what happens. & any experts out there feel free to butt in and stop me talking shit.

[Antallica]

Never pulled one apart, not really keen on doing it yet Afraid I'll bugger something real good.

[750Y]

don't pull it apart, let someone that knows what they're doing do it.

[jrandom]

don't pull it apart, let someone that knows what they're doing do it.

With that attitude we'd all go through our lives paying eedjits far too much money to do mind-numbingly simple jobs for us while we sat and watched TV. After all, it's better to Leave It To The Professionals, you know.

In Ant's case, well, since it's his transport appliance and he can't afford to screw it up, fairy nuff, but as a general point your advice sucks, man