Motovespa 160 + GT - Modellkunde, Motoren & Tuning

[discotizer303]

vor einer Stunde schrieb freddykrger:

Hallo!

 

Hat von euch schon jemand das Schutzblech einer GT160 getauscht? Bzw passt das der Sprint?

 

Falls nicht muss ich wohl das originale aufarbeiten...

Sprint passt. Fahre ich selbst.

[freddykrger]

Ok top! Vielen Dank!

 

Dann kann ich das ersetzen. Aufarbeiten kommt wenn überhaupt erst im Winter in Frage.

[keuk]

Alright, a batch of 5 parts will be on production soon.

Bearbeitet 8. Juni 2019 von keuk

[wheelspin]

One 

 

[freddykrger]

Looks great!

 

[discotizer303]

vor 2 Stunden schrieb keuk:

Alright, a batch of 5 parts will be on production soon.

sounds good.

[discotizer303]

vor 6 Minuten schrieb discotizer303:

sounds good, looks good.

 

[CrispyBacon]

Mee 2. How much?

[keuk]

vor 5 Stunden schrieb CrispyBacon:

Mee 2. How much?

Arround 60€.

[freddykrger]

I take one too.

[Werner Amort]

passt der auch auf gs 160/ SS 180

[freddykrger]

Die haben einen ganz anderen Motor. Der wird nicht passen.

[Werner Amort]

ja stimmt anderes bohrbild

[discotizer303]

vor 9 Stunden schrieb keuk:

Arround 60€.

Hi Antoine. One for me for sure.

[keuk]

Sure. I have noted one for you .

[wheelspin]

Can't wait for it...

You run it with a Dellorto VHST right?

I would like to try the VHST and a Polini CP type 19 to 23..

 

Has anyone convert the MV160 engine to reed valve intake with a "normal" two port barrel? This could be also an easy solution.

In my case I don't looking for high numbers on the dyno. I'm probably okay with 10 to 12 at the rear wheel though.

Any suggestions for an exhaust for the original barrel that will support the low transfer timings with good torque at low revs?

I was wondering if the P125 piaggio exhaust would be an option. Instead of all the box type exhaust...

 

 

[keuk]

I’m back on the original setup, 19er, to see first how the 170cc and the Sip road work. The sip road has a volume close to a px125 I guess.

 

I have increased a little bit the inlet timing by increasing the piston squirt cut from 126 to 140 according to Bollag’s advices. 

And timings are 120/150. And I have grinded a little bit the original manifold to make it match perfectly with the cylinder and the yellow spacer.

 

On the original setup I had a 84 main jet. I tried 92 100 110,  but in each case the full throttle is weird, bowwww and it’s a pain to  reach the maximun rev of the engine. Like if it was too lean. The rest of the power band is great .

I would like to solve this before struggling to find the good atomiser/needle matching on the Vhst.

Could it be the inlet timing or the exaust port too low ? Maybe the ignition ?  

 

[wheelspin]

Intake duration should be fine but don't go crazy at this area. A small step could be a step too far. 140° is okay.

The exhaust duration is too small.

There is no blow down duration.

I would recommend 160 to 165 as a first step. Maybe, if possible, in combination with something below 120 transfer duration. Because the area of the transfers is not too small, the windows are huge compared to the barrel.

[keuk]

Do you guys also have this timings on the original barrel ?

 

Bearbeitet 9. Juni 2019 von keuk

[wheelspin]

vor 20 Stunden schrieb keuk:

Do you guys also have this timings on the original barrel ?

 

 

 

Similar...

 

113/149

Intake 122

 

 

[keuk]

I thought I would have lowered them a little bit increasing the barrel diameter to 62.

 

What is Rückstand ?

Bearbeitet 10. Juni 2019 von keuk

[keuk]

Am 8.6.2019 um 21:57 schrieb wheelspin:

Can't wait for it...

You run it with a Dellorto VHST right?

I would like to try the VHST and a Polini CP type 19 to 23..

 

Has anyone convert the MV160 engine to reed valve intake with a "normal" two port barrel? This could be also an easy solution.

In my case I don't looking for high numbers on the dyno. I'm probably okay with 10 to 12 at the rear wheel though.

Any suggestions for an exhaust for the original barrel that will support the low transfer timings with good torque at low revs?

I was wondering if the P125 piaggio exhaust would be an option. Instead of all the box type exhaust...

 

 

 

 

About the reed valve I had this in mind too, but I didn't go further than a PLA prototype. 

[wheelspin]

vor 41 Minuten schrieb keuk:

 

 

About the reed valve I had this in mind too, but I didn't go further than a PLA prototype. 

 

Nice idea but I'm talking about the position of the p-range SI carb.

U know the small reed valve system to use with the SI carb. As long as the engine is not completed I would like to fit a reed valve for SI crabs to the engine to run it with a normal barrel.

[keuk]

It's a pity to modify the original casings, furthermore you will have to change or modify the crankshaft. What about a M1X ?

[digs]

Am 8.6.2019 um 06:08 schrieb keuk:

Arround 60€.

 

one for me too please. thanks 

Bearbeitet 11. Juni 2019 von digs

[keuk]

[wheelspin]

vor 8 Stunden schrieb keuk:

It's a pity to modify the original casings, furthermore you will have to change or modify the crankshaft. What about a M1X ?

 

A few days ago I did a reed valve conversion to a SS50 engine but that's another story...

In the end of the day it is what it is, an old and busted engine case... 

 

No, I don't want to spend too much money for a new barrel and I definitely not looking for a bunch of horses.

 

I will try your intake pipe first with a VHST or CP carb. 

Btw I'm looking for an air mixture screw for the original UA carb. Are there the dimensions around? The one of my carb was totally destroyed...

 

[keuk]

This guy has probably the part:
https://www.milanuncios.com/motos-clasicas/ducati-dellorto-207314789.htm

Or this guy:
https://www.milanuncios.com/motos-clasicas/dellorto-ub-ua-ma-me-263328703.htm

By my side I think I will test another new piston, I have 142 inlet and 0,5 gasket and already at 120 for transfert port. I would like to figure put how it works first with near original diagrams before I try to improve something

Bearbeitet 11. Juni 2019 von keuk

[keuk]

Or 

https://www.leboncoin.fr/vi/1607207019.htm

[wheelspin]

vor 3 Stunden schrieb keuk:

Or 

https://www.leboncoin.fr/vi/1607207019.htm

 

Thanks for the hint but I'm not sure if this is the correct one.

But I'm not familiar with this strange carbs..

 

This is what found in my UA 19

 

Bearbeitet 11. Juni 2019 von wheelspin