Top speed according to the setup

[rubymaxTopic starterBerichten: 73]

Hello everyone,

I mount on my set up new GIANNELLI FIRE yesterday. Till now I have SITO PLUS exhaust and top speed was around
60 km/h.

– DR EVO 43 with port matching
– dellorto 13/13 + malossi air filter, widen carb intake
– 90 mm vario with malossi contra yellow spring
– electronic ignition
– 9 g roller weights
– main jet 66 ( with SITO PLUS 64)

With new expansion exhaust and a litlle bigger main jet 66 (before 64)is top speed now 55 km/h. Where do I was making mistake. What could be a problem.:?

Thanks in advance!

[niek1992BijdragerBerichten: 1882]

9gr roller weights are a bit on the heavy side for the Gianelli fire. Gianelli fire have more power in a higher RPM band than the Sito Plus.

Try 6 to 8gram roller weights (if you can, mix them to finetune it).

[rubymaxTopic starterBerichten: 73]

Hello,

At home I have complete of 6 g, 7g and 9 g roller weights sets. Do you suggested me that I maybe mix 3×7 g and 3x9g or ??

[niek1992BijdragerBerichten: 1882]

Yeah you could start with mixing 6g with 7g. make sure to spread them evenly. first a 6g roller, then a 7g roller.
This would make a 6.5g average roller.

Problably a little bit too light, since the Gianelli Fire isn’t a highRPM exhaust, but definitely a higher RPM exhaust than the Sito.

[rubymaxTopic starterBerichten: 73]

Niek1992 thanks for the suggestions. Is it wise that you mix the 6g and 9g or 7g and 9g roller weights?

Anyone else have maybe another opinion.

regards

[niek1992BijdragerBerichten: 1882]

i personally think you should go lower with the weights. Friend drives a Polini speedengine with DR43evo, exhaust is a Gianelli original power, and he runs with ~6.5g rollers.

if i were you i would get my hands on one of those ”adjusting rollersets” (clickable). that way you can pinpoint the best rollers for your specific engine.

[VespaatjeDonateurBerichten: 613]

I have exactly the same setup.
My topspeed was 79 with main jet 70, gianelli fire, malossi vario and 7 grams roller weights. 😉

[rubymaxTopic starterBerichten: 73]

Today I have installed 6x 7g roller weights. Top speed is raising to 61 km/h. Should I go little bit down, maybe 3x 6g and 3x 7g?

[niek1992BijdragerBerichten: 1882]

yeah you could. If you keep your eye on your variator while accelerating, you can see if it’s variating too fast, and thus not reaching topspeed.

[rubymaxTopic starterBerichten: 73]

Do you mean by this if the roller weights are too light it variates too fast and vice versa too slow with heavier rolls?

:con

[zevenenergieDonateurBerichten: 4167]

I think this is wat niek1992 ment to say.

If the rolls are very licht, it wil not variate.:no and not reach topspeed.
If the rolls are to havy, it wil variate to soon.:no

So if you have a tuned setup that has its top power at say 9000 rpm, you need lighter rols than for a standaard setup.(y)

A set up whit a lot of power wil need a stronger spring in the cluch. en thus may need heavier rolls.:!
but the principle stays the same.:p

[hansiebModeratorBerichten: 10922]

Just wondering, which gears are you using .. 1:11,5?

[rubymaxTopic starterBerichten: 73]

Sorry for may late response, I have 1:12.5 gearing. Yesterday I was also put mixed 3x6g and 3x7g rolls (average 6,5 g) but the top speed remains around 60 KM/h (GPS) only the acceleration is maybe a little bit better. I assumed that with my gearing (1:12.5)I’ve already reach the limit:(

Do you think I must looking for gearing MALOSSI 1:9 or CIF 1:9.5? What about some bad experiences with CIF gearing?

regards

[Gebruiker]

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