Mid-race exhaust on stock 50cc

[hoecake]

Hoya! How would a mid-race exhaust perform on a stock 50cc? (ForRace4, C10 or C16, SCR Corse etc.) I was thinking about upgrading to a Athena Race 70cc (Stage6 Mk1 racing) later in the summer, but now during winter im gonna get a exhaust, carb and variator. As i really dont wanna buy 2 exhausts, im wondering how driveable a bike would be with a midrace exhaust like the ones mention above? Cheers!

[aeroxbud]

It wouldn't be good I'm guessing. The C10, or C16 would need higher revs than the cylinder would really like. You would need to have it setup for to work above 9,000rpm. At best it would be really peaky.

[oldgeek]

I agree with aeroxbud, the only thing in your list that may notably help your current setup will be the variator and it will take some fiddling to get the CVT tuned. The carb will do nothing and may not even be needed with the 70cc kit.

[hoecake]

Oct 24, 2024 5:13:31 GMT -5 oldgeek said:

I agree with aeroxbud, the only thing in your list that may notably help your current setup will be the variator and it will take some fiddling to get the CVT tuned. The carb will do nothing and may not even be needed with the 70cc kit.

So you are telling me that the shitty 12mm gurtner, that is hated by the whole of finnish moped culture, is fine for a racing 70cc kit?

[oldgeek]

Oct 27, 2024 16:09:04 GMT -5 hoecake said:

Oct 24, 2024 5:13:31 GMT -5 oldgeek said:

I agree with aeroxbud, the only thing in your list that may notably help your current setup will be the variator and it will take some fiddling to get the CVT tuned. The carb will do nothing and may not even be needed with the 70cc kit.

So you are telling me that the shitty 12mm gurtner, that is hated by the whole of finnish moped culture, is fine for a racing 70cc kit?

That's not what I said at all. I said that the variator would be the only thing to help your CURRENT setup. According to your first post you do not currently have a 70cc "racing kit"

[aeroxbud]

The Gurtner would be okay with a sports kit. But anything more, I would change it.

[hoecake]

Oct 27, 2024 17:09:17 GMT -5 oldgeek said:

Oct 27, 2024 16:09:04 GMT -5 hoecake said:

So you are telling me that the shitty 12mm gurtner, that is hated by the whole of finnish moped culture, is fine for a racing 70cc kit?

That's not what I said at all. I said that the variator would be the only thing to help your CURRENT setup. According to your first post you do not currently have a 70cc "racing kit"

I'm sorry, but did i read your first post wrong? You clearly wrote "The carb will do nothing for your current setup, *and may not even be needed for the 70cc kit*"

[oldgeek]

Oct 28, 2024 0:56:49 GMT -5 hoecake said:

Oct 27, 2024 17:09:17 GMT -5 oldgeek said:

That's not what I said at all. I said that the variator would be the only thing to help your CURRENT setup. According to your first post you do not currently have a 70cc "racing kit"

I'm sorry, but did i read your first post wrong? You clearly wrote "The carb will do nothing for your current setup, *and may not even be needed for the 70cc kit*"

I'm sorry, me not being familiar with the scoots you have over there, or the name brand of their parts I assumed when you said "gurtner" you were talking about an exhaust.

I still doubt a bigger carb would add anything to your current setup, buy yeah get a bigger carb for the 70cc. A 19mm PHBG has always been good on a 70cc for me, jumping up to a 21mm was overkill for me.

[hoecake]

Oct 28, 2024 5:36:38 GMT -5 oldgeek said:

Oct 28, 2024 0:56:49 GMT -5 hoecake said:

I'm sorry, but did i read your first post wrong? You clearly wrote "The carb will do nothing for your current setup, *and may not even be needed for the 70cc kit*"

I'm sorry, me not being familiar with the scoots you have over there, or the name brand of their parts I assumed when you said "gurtner" you were talking about an exhaust.

I still doubt a bigger carb would add anything to your current setup, buy yeah get a bigger carb for the 70cc. A 19mm PHBG has always been good on a 70cc for me, jumping up to a 21mm was overkill for me.

Alright, thanks for clearing things out. And yeah, i've never understood the fetish people have with putting carbs way to big on small setups. I know a lot of people that have 21 or even 24mm carbs on cast-iron 70cc cylinders. Goobers. (P.S. "gurtner" is the brand that makes the carb on all horizontal minarellis from 2002(?) forward, until they switched to 4-stroke engines.)