peugeot speedfight problem

[chaz e z]

Hello,
Iv been tuning my peugeot speedfight 100, i had a 120cc kit on it but the electric start used to really struggle turning it over even when it was run in, so i took it off and put the standard 100 back on. |I have a speed bell, racing clutch, stiff clutch spring, race variator with 7g rollers, kevlar belt, gear up kit, pm tuning 360 exhaust and doppler air filter and a 89 jet. I still only seem to be getting 55 still and it went 60 standard??? It won't move from the start till 5mph then takes off, is the clutch spring to stiff for the light rollers or isn't it jetted enough? I aren't sure. Any help would be much appreiciated.
Thanks
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Peugeot Speedfight 100cc (Fully tuned but confused!)
Vespa PK 135 (Fully tuned)
18 and live in Hull

[Durkiee]

[quote="chaz e z"]Hello,
Iv been tuning my peugeot speedfight 100, i had a 120cc kit on it but the electric start used to really struggle turning it over even when it was run in, so i took it off and put the standard 100 back on. |I have a speed bell, racing clutch, stiff clutch spring, race variator with 7g rollers, kevlar belt, gear up kit, pm tuning 360 exhaust and doppler air filter and a 89 jet. I still only seem to be getting 55 still and it went 60 standard??? It won't move from the start till 5mph then takes off, is the clutch spring to stiff for the light rollers or isn't it jetted enough? I aren't sure. Any help would be much appreiciated.
Thanks[/quote]


could well be the jets there pal im not sure which ones to put in but me and my mates have had problems like that in the past we always up-jetted it but best seeking advice form the place you bought the air filter from they could give you the right jets you will need
kind regards . Durk

[EnergyInducti...]

Typical speed fight, lol they do this all the time. You're either lookin at your jets, or, because you've got such power engaging with a snappier bite thanks to the performance clutch, you could well be encountering some belt slip.
This can be remedied with the use of a tougher contrast (torque) spring
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Riding: Yamaha RXS100
Aiming for : RD350 + Test
Dream bike: Suzi RG500 Gamma

[chaz e z]

Thanks for the replies,
Im still waiting for 21mm carb to come through the post still which i got for £15 I'll try that and if not i'll mess about with the contra spring and rollers i guess> When i bought my air filter it says at the bottom to upjet 15% and it doesn't say on pm tuning how much to upjet with the exhaust

Thanks
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Peugeot Speedfight 100cc (Fully tuned but confused!)
Vespa PK 135 (Fully tuned)
18 and live in Hull

[lonie]

ok so i recomend changeing the jet up by 5 or so sizes and see how much difference that makes also i agree you should get a torqeyer spring and maybe go heavyer on the rollers to
hope this helps

[stevo as b4]

I used a Malossi Multivar varitor and a kevlar belt on mine. I never had a good take off and below about 10mph it was much much slower than standard. I tried alot of things to sort it, but i never went back to the std variator which i think would have been the best bet tbh!

The Kevlar belt was too wide, so it wouldn't give max range on the pulleys was problem No.1, then a std belt was not really strong enough for the extra power, and i wound up changing them every 2000km max, as once the first one had snapped and locked up the back wheel at 50mph, i lost my nerve with them tbh!

I also always felt that the Malossi variator was causing the transmission to start in a mid gear position even though the rear spring was a strong one. I didn't have a gear up kit on mine, and without a 125cc big bore kit you don't need one to do a true 62-65mph, either.

The performance exhaust does reduce low down power, but the carb jetting can be got right to remove the flat spots and give good carburation through the useable rev range. This did'nt fix the problem either though!

The clutch on the speedfight isn't that great, and i tried the strongest Malossi springs and drilled and filed the living shit out of the clutch shoes, all to not much of an improvement. It would engage at too low revs for the exhaust to work, and thenthe motor would bog under the load until it could pick up again. I think the PM exhaust is supposed to give a better power spread than the Doppler pipe i used, but the pipe liked to run 7600-8000rpm, and the clutch ideally needs to slip or not engage until at least 6k like it would on a 50cc scooter. When i tuned mine 7years ago there was no uprated or adjustable race type clutch available for the 100cc Pug, hence all the messing around i did with the std one.

I also found that Roller weights going up or down 1-2grams did'nt make any difference to the poor off the line performance, so it always seemed to me to be the Variator and partly the shit clutch at fault.

The problem or one of the problems you have got is all the parts you have fitted now, and where to look at first? Personally id go back to std and just fit the exhaust and then get that set up spot on jetting wise first! I think it's best to do all the engine mods first on an auto and then spec and tune the transmission to suit!

You don't want that gear up kit and probably half the transmission changes and bits you have got fitted thats for sure with a 100cc motor.

BTW, if the starter was struggling with turning over the engine, assuming everything was ok with your 125 big bore kit, then you can fit a Honda CBR400 spec Battery to the Speedfight, if you mod the retaining strap over the battery tray.

Good luck sorting it out, and if you go back to std and just keep the performance pipe, i think you will like the bike more, as well as being able to sell on all the tuning bits and get some cash back. The Speedfight put me off autos for life, and from then on i've much prefered to use different size sprockets and shorten drive chains as needed, as it's so much easier to change the gearing on a manual transmission bike and get it to perform differently, and often more like how you want it to!

[stevo as b4]

Another thing, it's only my opinion, but the 21mm carb is probably the least effective mod i did on my Speedfight. It was a bitch to fit and i could'nt use it with a std airbox, so i had a K&N clamp on jobbie, and it just turned into a dirty soggy wet mess! The auto choke can't be fitted, the throttle cable was a bit too short to be ideal, and it took alot of re-jetting on a dyno to get it right.

If do go ahead with the 21mm carb, then just to let you know i used a 102 main jet which was about right on mine. I can't remember what needle, needle jet, slide, and pilot jet were used, but they were all changed several times to get it sorted. Oh and the carb can fall off the rubber stub once it has been on and off more than a few times, so get a new rubber inlet boot for it to be safe.

Let me know if you get more than 11.8bhp out of it too, as that was the best dyno run i ever got from mine.

[st3v3]

Can I randomly enquire, why such extensive mods?
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Roger wrote: Women don't get damp for clingy puppies. Get some better happy pills, hit the gym & buy a medallion the size of a dinner plate. Job done

[chaz e z]

i was going to buy a 50cc and mod that but i thought i would do my speedfight instead. The crank had sheared so i thought i'll tune it while i have all the engine apart. Iv only rebuilt 5 engines and tuned 3 so far. Hobby i guess
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Peugeot Speedfight 100cc (Fully tuned but confused!)
Vespa PK 135 (Fully tuned)
18 and live in Hull

[chaz e z]

cheers for that information stevo will help a lot!
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Peugeot Speedfight 100cc (Fully tuned but confused!)
Vespa PK 135 (Fully tuned)
18 and live in Hull

[chaz e z]

I'm keeping my standard carb now and i think i may take off my race variator and put back on the standard one and see how it goes, does anyone have any idea on which main jet i should use? Im running 100cc barrel and piston still with a doppler air filter+pm tuning 360, should i go from 89 to about 95? Thanks
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Peugeot Speedfight 100cc (Fully tuned but confused!)
Vespa PK 135 (Fully tuned)
18 and live in Hull

[stevo as b4]

Unless PM can/will help you which i very much doubt they are interested then your going to have to take a reasonable guess, or just buy a packet full of jets and spark plugs and try them out to see where you need to be.

PM will have a very good base setting for their pipe and sports filter as fitted to the bike they tested/developed the pipe on. You should get in touch and ask why they havn't given you the jets and jetting advice for one of their performance products TBH. It's my experience that they will be unhelpful and offer to sell you a shed load more parts that will all work with the bits you have got etc.

How you think that they make all that money out of scooter tuning? Giving honest advice and sharing known tuning knowledge is certainely not one of them though!

I got my 21mm carb set up on a dyno at a stupidly high cost, but it was nothing even close as std. If your keeping the std carb, then just go up a couple of sizes on the MJ first and see what happens. If the std jet is say a 90, then a 94/96 would probably be close, but you'd need to sort out the part throttle stuff as well and before you select a final MJ size too. This is where carb tuning takes alot of time and experience as well as a decent selection of spare parts available to get it right.

[chaz e z]

Right cheera, I'l buy a pack of main jets i think and do a bit of testing, i put back in my standard clutch spring tonight and i seem to have a better take off and top end, I can see were the belt has been on the variator and it has been 3/4 of the way up so i think i need heavier rollers but i rekon my standard variator will be better. Thanks for the help
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Peugeot Speedfight 100cc (Fully tuned but confused!)
Vespa PK 135 (Fully tuned)
18 and live in Hull