@phaetn avatar
UTC

Addicted
'78 Super 150 Mk II ported DR177, banded clutch, ASC Big Bore
Joined: UTC
Posts: 664
Location: Ottawa, ON, Canada
 
Addicted
@phaetn avatar
'78 Super 150 Mk II ported DR177, banded clutch, ASC Big Bore
Joined: UTC
Posts: 664
Location: Ottawa, ON, Canada
UTC quote
NightWing wrote:
Double clutching is needed on transmissions that aren't synchronized between gears, or those that have bad synchronizers.

I haven't driven a manual Vespa since 1967, but I remember that the bike can be shifted in motion by working the throttle against a pre-loaded shifting grip and nothing would grind. I had to use that technique a few times when I broke a clutch cable and was miles from home. I could even start from a stop like that. It was abrubpt and quite a jolt but it could be done. Vespas are amazing.
Indeed, I did the same thing earlier this summer when I had the clutch cable snap. I timed my ride home so I'd never have to stop for a red light and carefully selected each gear matching RPM to speed and gear and shifted clutchlessly. Only once was I forced to stop (ack!) and then I rammed it into first (thankfully nothing broke on the shifter!) and popped the front wheel a bit, but then I was off and could continue to nurse it home. Now I've got spare cables for everything (with new teflon-line outer housings, too) so this time around I'd just quickly change the cable on the road (probably sub 15 mins).

As I'm sure you know, Nightwing, even in cars will full synchro-mesh gearboxes you can change gears quite seamlessly without the clutch as long as you correctly match RPM in the appropriate gear for the given vehicle speed. It's easier to do upshifting than down, of course.
OP
@megnez avatar
UTC

Molto Verboso
1979 p200e
Joined: UTC
Posts: 1201
Location: Baton Rouge, LA
 
Molto Verboso
@megnez avatar
1979 p200e
Joined: UTC
Posts: 1201
Location: Baton Rouge, LA
UTC quote
Re: shifting woes
cajun wrote:
i,m nelson i rode this scooter many miles & can tell you on a normal street corner turn you don't need to go lower than 3rd gear, it will accelerate fine from speed of 15 & up , downshift 1 gear at a time don't downshift quickly this will give you the bumpy braking. when up shifting don't look at shifter just listen to the clunk when changing gear, every clunk is one gear change. drive safely take care of yourself & scooter. nelson richard
Hey, Mr. Richard! Good to see you on here.

Yeah, I've noticed I can take corners in 3rd with no problems. After a little while of listening to and feeling the engine in normal riding situations, I think I got it down. I just needed some more riding time with it.

You should post more often, you could contribute a lot here.
@iamjoemckim avatar
UTC

Member
'81 Special
Joined: UTC
Posts: 31
Location: Wolverhampton, UK
 
Member
@iamjoemckim avatar
'81 Special
Joined: UTC
Posts: 31
Location: Wolverhampton, UK
UTC quote
I've always done my own little system, and its worked fine for shifting down

1st = 0-10
2nd = 10-20
3rd = 20-35
4th = 35-50
@aviator47 avatar
UTC

Moderator
2006 PX 150 & Malossi Kitted Malaguti Yesterday (Wife's)
Joined: UTC
Posts: 12955
Location: Paros Island, Greece
 
Moderator
@aviator47 avatar
2006 PX 150 & Malossi Kitted Malaguti Yesterday (Wife's)
Joined: UTC
Posts: 12955
Location: Paros Island, Greece
UTC quote
iamjoemckim wrote:
I've always done my own little system, and its worked fine for shifting down

1st = 0-10
2nd = 10-20
3rd = 20-35
4th = 35-50
I would be willing to say that the consensus is that as you become more familiar with your specific scoot, shifting (up and down) becomes more intuitive. Each vehicle has it's own characteristics, just as each driver does. Over time, the two blend. Things I did "instinctively" on my VNB 125 needed to be modified somewhat on my PX150. At first, I had to think about it a bit, but with time, I adjusted to the PX's different characteristics and I now react and anticipate based upon the newer and different scoot.

Al

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