Ditching Gurtner... what to buy?

Andy /

Mar 17, 2008 05:56PM

I'm running a 1978 Peugeot 103LS. I've been messing with jets to get the right mixture and most power but I give up. I need to downjet more but if I do (to a #50) I'll lose a ton of power and still only go about 27-30. That won't do. I guess it's time to ditch some stock stuff.

Figured I might want to ditch the carb, intake and reed set. But what should I replace it with?

Intake: treatshq has this , which was recommended to me by a dude in sac.

Myron in Fullerton recommended a Tomos reed-valve, will this one work?

As for the carb, what size is recommended? Treats recommends sha 14-16. I've heard others say 15-15.

thanks in advance!

Ditching Gurtner... what to buy?

Andy /

akpasta

Mar 17, 2008 06:01PM

damn links.... this is what I wanted to say:

I'm running a 1978 Peugeot 103LS. I've been messing with jets to get the right mixture and most power but I give up. I need to downjet more but if I do (to a #50) I'll lose a ton of power and still only go about 27-30. That won't do. Besides, I don't think I can even find a #50 anyways. In case y'all didn't know (I found out today) the 103LS was the governed model for square states with 20-25mph laws. I guess it's time to ditch some stock stuff. I want to get going 30-35 at least so as to feel safe riding around in traffic.

Figured I might want to ditch the carb, intake and reed set. But what should I replace it with?

Intake: treatshq has an 18-21, I need a sloping intake to fit the dellorto under the frame. Is that the right size?

As for the carb, what size is recommended? Treats recommends sha 14-16. I've heard others say 15-15. I'd like to retain 80 or so miles per gallon.

Myron in Fullerton recommended a Tomos reed-valve, will a Tomos a35 reed valve (as seen on 1977mopeds) work?

thanks in advance!

Re: Ditching Gurtner... what to buy?

Graham Motzing /

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grahammotzing

Mar 17, 2008 06:10PM

tomos reedvalve would work, so would the tomos intake, or the treats intake with tomos reedvalve. the 2 petal that comes with the polini puch kit would also work, a lot of people ditch them to put on 4 petal malossi boxes.

Re: Ditching Gurtner... what to buy?

Andy /

akpasta

Mar 17, 2008 06:30PM

Fuck it, I got the intake from treats and the dellorto sha 15.15 cable choke from dellorto direct.

Should I bother with a tomos reed valve?

Re: Ditching Gurtner... what to buy?

Flagrant - /

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stevew

Mar 17, 2008 07:14PM

yea tomos or polini reeds help. Gutting out your exhaust is good too if you haven't done that.

Re: Ditching Gurtner... what to buy?

Andy /

akpasta

Mar 17, 2008 08:22PM

I've de-restricted the exhaust, but it just made it louder... doesn't go much faster.

Re: Ditching Gurtner... what to buy?

Flagrant - /

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stevew

Mar 17, 2008 09:30PM

There is a cheap mini expansion pipe on 50cc nl for 20 euros. I have one and it works amazingly good. No installation problems

Re: Ditching Gurtner... what to buy?

Andy /

akpasta

Mar 18, 2008 03:09AM

can you tell me which one it is? I'd really dig an expansion pipe.

Re: Ditching Gurtner... what to buy?

finny /

Mar 18, 2008 12:10PM

I'm guessing he is talking about part no. 19387 at 50cc. Just remember that you do get what you pay for.

Re: Ditching Gurtner... what to buy?

Flagrant - /

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stevew

Mar 18, 2008 01:45PM

Yea the stinger on this pipe seemed a bit small for high RPM so I drilled a bleed off hole in the pipe

Re: Ditching Gurtner... what to buy?

Andy /

akpasta

Mar 20, 2008 01:38PM

One more thing....

Peugeot throttle and choke cables are bare at the tip. They attach to the carb with little metal clamps that have a hole in them. You threat the cable through the hole and tighten the screw on the side of the tiny clamp. They don't have the bullet end tip like most carbs that connect via a dellorto. does that mean I need to re-cable my throttle and choke for the Dellorto?