The Honda PCX / Forza / ADV150 / SH Forums

It's not something like the back suspension bolts not tight or something thing like that. When the bikes on the stand the engine/ transmission is hanging on the rear shocks, but when it's off the stand the weight of the bike is supported by the rear suspension.
It might only do it off the stand in the running position.

iceman wrote: The shudder is a common ailement of the PCX, and as others pointed out to me recently on this forum, is often due to glazing of the clutch/belt due to being too gentle taking off from a standstill. I spent a few days twisting more fully, but not WOT and the judder mostly went away and the horrible whining noise I had at low mph went too.

Oh I don't think you could accuse me of being "too gentle" taking off . Ever since I had the NCY variator installed, I did pretty much WOT takeoffs because it was fun watching a scooter tear ass ahead of cars .

iceman wrote: The shudder is a common ailement of the PCX, and as others pointed out to me recently on this forum, is often due to glazing of the clutch/belt due to being too gentle taking off from a standstill. I spent a few days twisting more fully, but not WOT and the judder mostly went away and the horrible whining noise I had at low mph went too.

Also forgot to ask, but if this is a common ailment, aren't there common symptoms as well?

Shuddering aside, wouldn't the engine rev up like crazy if the clutch was slipping? I'm just wondering because I recall my earlier MSF Rider's Course training on a Honda Nighthawk and that would be exactly what happened if I squeezed the clutch and twisted the throttle at the same time. The engine would rev up, but I wouldn't go anywhere. In my case, the PCX is pulling forward very slowly, and it's like the revs won't go any higher until the PCX builds up enough forward momentum to overcome the weight resistance. Basically it's like I literally have zero torque at the lower rpms ranges.

I mean, occasionally at high speeds I would have a sensation like the throttle closed itself even when it's twisted open, but I never hear the revs get any higher.

I once had a noise on the Vision I could have swore it was from the front, turned out to be from the rear and the seat hatch needing grease.

Just a thought JoeJoe, try removing that central bar you have and see if it's not resonating when the engine is running at any speed while on the road.

Okay, so I swapped out the stock clutch with a Malossi Delta Clutch. There's an improvement, but it's very minor. The mechanic suggested either using lighter weights or a stiffer center spring. I'm a bit amazed how he can say that given that it's currently pulling at 8500-8800 rpms due to the 10g weights, but whatever, more money out the door <_<

Valiant wrote:

iceman wrote: Basically it's like I literally have zero torque at the lower rpms ranges.

I mean, occasionally at high speeds I would have a sensation like the throttle closed itself even when it's twisted open, but I never hear the revs get any higher.

Is your fuel mixture way off because of all of your other mods? The stock PCX fuel program has a soft launch which is holding back either fuel or timing to make the first few yards of take off more tame which makes the bike easier to control around parking lots and easier on the clutch at launch.

Yep. I installed the 175cc BBK and performance camshaft with a larger fuel injector, but I wasn't able to install the 31mm throttle body and 31mm manifold because of missing parts. I didn't really think it would matter as I only expected it to run richer all throughout the rpm range, and maybe with power dropping at higher rpms(9000+) because of the lack of airflow.

Wouldn't it have an opposite effect of taking off too hard if the fuel mix is too rich?

Valiant wrote:Wouldn't it have an opposite effect of taking off too hard if the fuel mix is too rich?

No. Not running right is not running right. Rich or lean. You need a fuel controller and a wide band O2 sensor to tune your new parts whenever you make radical changes like that to a fuel injected engine.

Checked the shocks yesterday while on the side stand and they seem to be fine...

(getting a little confused with the replies as other people saying about their problems...?)

so yeah, not sure what it can be, for it to be when the throttle is pulled, even the smallest turn all the way to full...
doesn't sound like its the front or the right side, def sounds like the left....
again, not sure whether it's something loose or not as it's only come on gradually,
the middle bar I put on the day I had the Bike so I cant see that causing anything,
especially as the Bike was fine for awhile at the beginning with no rattle,
only thing was the screen which I packed with sponge and thats been fine,
but this other throttle rattle has come on gradually and worse as time goes on...
again, I can take the side casing off to get to the belt etc but that was apparently already done by the local dealer,
they said they couldn't find anything wrong...
sooooo god knows.

jojo87 wrote:they said they couldn't find anything wrong...

They didn't try hard enough. You need to be there in the shop with them while they are working on it to demonstrate the problem.

I was going to wait until I get to 600 miles and have them do the first service and let them know about it again, I can't actually be there as I can't get there as it isn't that local to me,
they had to come and collect and drop the bike off....
I have about 150 miles left to do,
what is the first service on these Bikes?
I cant remember what it says in the book, is it just the oils or the spark plug and air filter too? or was that more down the line :-/

Just oil and inspection - but not valves.

sendler2112 wrote:

Valiant wrote:Wouldn't it have an opposite effect of taking off too hard if the fuel mix is too rich?

No. Not running right is not running right. Rich or lean. You need a fuel controller and a wide band O2 sensor to tune your new parts whenever you make radical changes like that to a fuel injected engine.

Okay, but wouldn't that still be useless without a fuel map of the original stock settings in order to know what AFR to go for at each throttle position and RPM range?

isn't there one of your own threads where we can talk about this so we don't keep taking this one off track? She is having a real problem.

sendler2112 wrote:isn't there one of your own threads where we can talk about this so we don't keep taking this one off track? She is having a real problem.

It's this thread isn't it? Doesn't jojo need to get her bike sorted out under warranty and that's It?

Dealer said they cant find anything wrong so haven't gone through to Honda about it...
obviously if anyone else reads this and has had similar or the same problem, they can let me know,
I was getting a bit confused as someone was going on about a different problems,
not sure which replies are to me or them etc.

sendler2112 wrote:isn't there one of your own threads where we can talk about this so we don't keep taking this one off track? She is having a real problem.

http://www.hondapcx.org/viewtopic.php?f ... 9&start=20

We miss you in the Performance section .

jojo87 wrote:Dealer said they cant find anything wrong so haven't gone through to Honda about it...
obviously if anyone else reads this and has had similar or the same problem, they can let me know,
I was getting a bit confused as someone was going on about a different problems,
not sure which replies are to me or them etc.

Well I was tossing my issue out there since it sounded similar.

Did they check the clutch? While replacing mine didn't solve the issue, it isn't as bad as it was before. Plus my stock clutch bell & pads were glazed to perfection:

It's gone to a sort of rub/roll sound now, not much of a rattle....
constant, kind of like the noise when you hand turn the back wheel,
mine has a loud rubbing sound...
but when riding, when the throttle is pulled its louder,
but even now when rolling its there...
might take the casing off the side now but again, wouldn't be sure what i'm looking at,
if anything is wrong etc, i'll take photos though...
really annoying, lush sunny day and the noise is just REALLY annoying,
I don't wear earplugs or earphones as I like to hear around me, horns, sirens etc etc...
so yeah, need to get this sorted, especially as it wasn't there when I got the Bike.

Plenty of posts, pix and videos of what you'd be looking at if you took the belt cover off.
After you remove the cover - with the key off & in your pocket - look at things, wiggle things, pull on things - you're looking for whatever might be causing the noise.

Then, Keeping your fingers out of stuff - start the scoot on the center stand and take a look at things as they're moving - twist the throttle and watch & listen. Watch the belt working and the round bits spinning at each end of the belt.
Shut it off.

Look at the inside of the cover you've removed - you're looking for rub marks, or whatever might be causing the noise.

Or, take it to the dealer and have a listen with the technician.
Fish