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Post by takhsgt on Nov 16, 2023 15:40:28 GMT -5
Hello everyone my name is takis!! I am from Greece and i am glad that you have 2 stroke forum! In my country it's not so popular the 2 stroke anymore! I have a Piaggio liberty 50cc2t 2010 model. I have bbk 70 malossi 17.5 phva with 88 jet stock air box tecnigas next r pipe malossi variator and stage6 hpc crankshaft with foul rebuild and leak test! is bogging at foul throttle with multiple gram rollers! Sorry for my English
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Post by aeroxbud on Nov 16, 2023 16:01:47 GMT -5
An 88 jet might be too big. My typhoon came with a 58 size jet as standard. You are generally looking at a 5-10% increase in jet size for a bit bore kit.
Was it running okay before? Or have you just installed the Malossi kit?
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Post by takhsgt on Nov 16, 2023 16:24:27 GMT -5
I put 70cc just for fun! The stock jet was 56!. 82 is the smallest i have try! I was having problems with e choke but now is manually
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Post by takhsgt on Nov 16, 2023 16:31:36 GMT -5
65 70 jet like you said it is ok you think? I am afraid for lean condition with exhaust and bbk 70
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Post by aeroxbud on Nov 17, 2023 3:28:50 GMT -5
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Post by takhsgt on Nov 17, 2023 3:51:40 GMT -5
Thanks for the advice i Wil order a puck of smaller jets! At 1/4 of throttle when accelerate is very good and the kmh is rising! at 3/4 or wot only noise and very slow acceleration!
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Post by anttikauko on Nov 17, 2023 5:02:21 GMT -5
If PHVA 17,5 has restrictor plate at the carburetor intake, the jet sizes are smaller (main jet 50 -56 and idle jet 32 -34) and the jet needle is A22.
When You remove the restrictor plate, You need to change a bigger mainjet and a bigger idle jet and and a richer jet needle. A richer jet needle is very important!
My 70 cc Derbi runs well with a following setup:
Idle jet 38
Main jet 84
Atomizer GA210
Jet needle A25 (2,02 x 1,40 x 20) clip 2/5 from the top
Slide 30
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Post by takhsgt on Nov 17, 2023 5:31:13 GMT -5
It didn't have restricted in carburettor and from exhaust i remove it! Is very difficult to find needles here in my country! I will take of the carburettor to check the needle! I have had a mikuni 24 stock from 125 typhoon for test and i was have the same problem!
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Post by takhsgt on Nov 17, 2023 5:42:58 GMT -5
I will try to play with the needle position i only had richen 1,2,3 from the top! I will try lower position
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Post by takhsgt on Nov 19, 2023 6:37:14 GMT -5
Yesterday i put a tachometer and i have seen that with every combination of rollers 5gr to 7.5gr and contra springs the rpm immediately climb to 9150-9300! I want about 8700-9000rpm(malossi multivar) any ideas (i think the problem is the variator and not the curb 80mj now i feel it lean)
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Post by Zino on Nov 19, 2023 7:43:19 GMT -5
When yo say climb to is that peak rpm that she maxes out for each weight range?
Or is it the speed the rpm’s jump to 9100- 9300 when you hit the throttle wide open then it peak at a higher rpm ?
You would be looking for the jump to rpm for setting variator in that range.
With the weight range you are running the rpm’s should be wider for when you hit the throttle wide open .
Rpm’s should hold as the variator shifts and then rise
Peak rpm’s tends to level off at the same place with different weights
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Post by takhsgt on Nov 19, 2023 8:08:44 GMT -5
9100-9300 is the max rpm i have seen with every combination of rollers weight almost immediately when i hit full throttle it feels like it finishes all the gears too soon (like slipping belt but it didn't) i have marked the variator it left 2mm
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Post by takhsgt on Nov 19, 2023 8:14:52 GMT -5
If i turn the throttle 2/4 rpm fall at 8500 and is much faster! When i wot it scream with slow acceleration
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Post by oldgeek on Nov 19, 2023 8:22:02 GMT -5
Turn the choke on at WOT and see if that helps.
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Post by takhsgt on Nov 19, 2023 9:04:46 GMT -5
I can't because is on the carburettor switch! i all ready try it but I can reach!😤😁
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