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Peugeot Speedfight - No acceleration

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The Gatekeeper
L Plate Warrior



Joined: 19 Dec 2019
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PostPosted: 10:39 - 19 Dec 2019    Post subject: Peugeot Speedfight - No acceleration Reply with quote
Hi All,
Can anyone help with this issue:
Its a Peugeot Speedfight 3 2 stroke 50cc.

It is really slow pulling away. Eventually it picks up speed and is fine until you need to stop.

So far, it has had the following replaced:
Variator with 5g Rollers,
New clutch with blue springs
New Belt
Bew piston and cylinder
"Performance" exhaust
Rejetted for the items changed.

Any ides what else to try?
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Tankie
Crazy Courier



Joined: 24 Feb 2017
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PostPosted: 11:01 - 19 Dec 2019    Post subject: Reply with quote
clean the air filter
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 11:12 - 19 Dec 2019    Post subject: Reply with quote
Does the engine seem to run properly?

If so, it might be something to do with the variator. Did it ride as it does now with the original variator? Not hard to restore it to standard & check.
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The Gatekeeper
L Plate Warrior



Joined: 19 Dec 2019
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PostPosted: 11:36 - 19 Dec 2019    Post subject: Reply with quote
Engine runs fine, air filter is clean. It did this before I changed everything. Would putting red springs and 6g rollers improve it?
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Easy-X
Super Spammer



Joined: 08 Mar 2019
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PostPosted: 13:06 - 19 Dec 2019    Post subject: Reply with quote
Pissing about with springs and weights doesn't make as much of dramatic difference as people like to make out Smile

How bad is it? Bad enough that it might stall if you don't "nurse the throttle" ?

Basically we need to narrow down whether the issue is the engine not running properly or a transmission problem.
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 13:09 - 19 Dec 2019    Post subject: Reply with quote
The Gatekeeper wrote:
Engine runs fine, air filter is clean. It did this before I changed everything. Would putting red springs and 6g rollers improve it?

Changing variator rollers won't make any top speed difference but may affect acceleration, however if you've got the thing back together wrong it won't work properly, so as you say it runs properly and eventually gets up to speed my guess is assembly issue or roller weight issue. Could be some clutch issue I guess but I freely confess that's guesswork. Has it got the correct belt which is not slipping?

So since you got the thing it's always had "slow acceleration" but gets to the normal top speed eventually, and stopping repeats the process?


Fitting rollers:

https://www.adrenalin-pedstop.co.uk/Tutorials/Tutorial8.aspx


There's a good write-up on variator experiments here:

https://www.pedparts.co.uk/blog/moped-tuning--rollers
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The Gatekeeper
L Plate Warrior



Joined: 19 Dec 2019
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PostPosted: 13:17 - 19 Dec 2019    Post subject: Reply with quote
Easy-X wrote:
Pissing about with springs and weights doesn't make as much of dramatic difference as people like to make out Smile

How bad is it? Bad enough that it might stall if you don't "nurse the throttle" ?

Basically we need to narrow down whether the issue is the engine not running properly or a transmission problem.

It revs but goes no where. It ticks over fine, its just hardly any drive Full throttle the engine is reving perfectly but the pull away is so slow? Once above 10/15mph its fine.
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 14:41 - 19 Dec 2019    Post subject: Reply with quote
The Gatekeeper wrote:

It revs but goes no where. It ticks over fine, .


Are your vag lips caught in the wheel?
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Triumph Sprint ST 1050
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Easy-X
Super Spammer



Joined: 08 Mar 2019
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PostPosted: 16:36 - 19 Dec 2019    Post subject: Reply with quote
The Gatekeeper wrote:
It revs but goes no where. It ticks over fine, its just hardly any drive Full throttle the engine is reving perfectly but the pull away is so slow? Once above 10/15mph its fine.


If it's running okay on the mid to high end of the rev range I think we can discount issues with fuelling, air intake and exhaust. That leaves a blocked or wrongly sized pilot jet, a blockage in the pilot circuit of the carb, idle and air screw adjustments.

On the transmission side if you had a loose belt that should be obvious from inspection. I take it you swapped out the small clutch springs. How about the main big one?

Other that I can only think of disassembling the whole CVT to make sure all the parts are moving freely. The old turd scooter I rebuilt had seized plates (effectively "stuck in bottom gear") stuck in "high gear" seems unlikely though Thinking
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The Gatekeeper
L Plate Warrior



Joined: 19 Dec 2019
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PostPosted: 17:55 - 19 Dec 2019    Post subject: Reply with quote
Nobby the Bastard wrote:
The Gatekeeper wrote:

It revs but goes no where. It ticks over fine, .


Are your vag lips caught in the wheel?


Lol, it's not mine, it's my sons! I ride a Z1000SX, a Sprint ST1050 and a KTM EXCF350! I was embarrassed when I test rode it!!!
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stevo as b4
World Chat Champion



Joined: 17 Jul 2003
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PostPosted: 19:57 - 19 Dec 2019    Post subject: Reply with quote
You need to get the fuelling near correct for the modifications before you attempt to try and set up the transmission and clutch. Also if its a cheap poorly designed exhaust system, then you might not be able to get it to run well without a flat spot before it gets into the power band.
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Old Thread Alert!

The last post was made 6 years, 37 days ago. Instead of replying here, would creating a new thread be more useful?
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