Piaggio hyper race on rexy frame, the true sexy rexy.

[aeroxbud]

I think the stock studs are 106mm M6. The Minarelli vertical is the same 106 M6.

[808ministroke]

yah so i removed the suspect cylinder stud, no damage to the case threads , woot. the end were the nut goes was stipped and it measured about 102mm with a few mm probably gone so iwas able to find some m6 109mm i believe and they will deff. work it seems so thats one problem down.
plus the head gasket was indeed blown.
lucky for me i have a replacement that will indeed work perfect that was for the head of mhr 77.

so by the end of the week i should have new studs and nuts plus be able to change out the head gasket, plus knock on wood, will be installing the yasuni r so this nightmare was averted and i can dream of the weekend.
thanks everyone for your help, if not for this forum i wouldnt have gotten close to were i am and what would i even do without this obssesion/hobby? thanks to this forum we never have to go down that dark, dark road...

[808ministroke]

so seemingly every thing that had my engine on the brink of goin BOOM was completely remedied for no money out of pocket. lucky for me cuz i had spent my scooter fund for a while on a new belt and yasuni r.

i got my replacement 109 mm studs and m6 nuts from st.ca two days after ordering and for free. i asked as to why i never received free shipping and was told that my total had to be 200+ BEFORE shipping charge. looking at my orders i had like ten that were between 160-190$ so they gave me free shipping and $25 voucher! which really came in handy and is why i was able to make all repairs two days layer for free essentialy.

im finishing this post sitting next to my moped now after doing a top speed run for a baseline to see how the pipe changed top speed, i got 61mph gps actualy thought i saw a cop so i let off early but still had a good stretch to accelerate i was tycked but do have on a heavy backpack of tools so added to me thats like maybe 200lbs .i think woth no Change is it all could have probably hit 63 and that is without changing any jets after changing pipes as well as a worn belt and I think my roller weights maybe too Little weight. Currently running a mix with 5.5 and 4 g. I went later before as this cylinder likes to rev However after truly knowing what the power band is for my pipe I have to set the CVT up for a lower rpm I'm thinking tomorrow I will change out to a fresh belt and do the marker on my very eater which is something I've known about but never actually tried in real life I may make the marks tonight and then again after with a new belt. 2 things I wanna know how many guys that really know their ship is will a better tuned CVT system without added travel such as a over range Truly add more top speed or knowing my current set up will it most likely just add better acceleration and a more linear one?

Last question is these engines seem to not need an exhaust gasket as the flange is attached to the pipe at least that's what I've been assuming soAnd it's a pain to even just fit the pipe on without a gasket on this modified mouth I'll post a picture of how it looks currently one side of the flange is actually not all the way to the top where it meets the boar I know these engines come factory without head gaskets and maybe even base gasket so do these things come out factory without exhaust gaskets to?,?

[aeroxbud]

Because of the domed design, the exhaust doesn't need a gasket. Though you haven't tightened it very evenly.
Once the CVT has run out of travel. The top speed is fixed. It will only go faster if the engine can rev higher.
If you look at this graph it shows you where the pipe makes peak power. www.pedparts.co.uk/c/asset/yasuni-power-graphs.png

[808ministroke]

Nov 20, 2020 5:50:27 GMT -5 aeroxbud said:

Because of the domed design, the exhaust doesn't need a gasket. Though you haven't tightened it very evenly.
Once the CVT has run out of travel. The top speed is fixed. It will only go faster if the engine can rev higher.
If you look at this graph it shows you where the pipe makes peak power. www.pedparts.co.uk/c/asset/yasuni-power-graphs.png

yes I understand that once the CVT is Max though the only way to game speed is to raise Rpm however if your belt is worn like mine is and therefore is not as wide it cannot sit as high on the low gear or the high gear because The gap even when the Pulley is fully open If the belt is not wide enough in narrow it won't be able to ride on be very outer edge ... At least that is how it works from my understanding and everything that I've read if I remember
Also thanks for the graph although I have seen all of these dyno test from this website it's one of the only sites that really Donald a lot of pipes in show what 1 beats out the other however the pipe is only is good as the cylinder for making power what I'm saying is if you look at your graph and assumed that it would be the same peak power and rpm for every cylinder not just for the 1 they used in that test then the yesu ni C16 would be more powerful Then the C21 or C30 and that we both know it's not the case every cylinder well affect how a pipe performs on my setup I guarantee you the C30 would come in 1st then the C21 &c 16 in 3rd.
The one thing I'm not a 100% on is how much the cylinder affecks where the power band comes in meaning if you have a higher revving cylinder with a lower revving pipe would that in turn make the power band of the pipe any different? O and thank you for the gasket information now I feel better.

[808ministroke]

So I remember somebody Saying that name smaller carb would increase my Foreman's Over all. I have a 19 mm drlorto phbg And the intake Hey anyone and everyone to please Give me your 2 centsI'm running in 86High revving up a cylinder with such Smaller carb , 24mm , Was the recommended minimum for this Kit although that was meeting the hype and Ignition that I do not have I merely curious to know whether in it will increase especially the top in and not overheat because of it.

[808ministroke]

Here is a picture of the Mena rally verses Piazzi O head Notice the piozzi O is square and the mina A triangle they both have the same head gaskets though Other picture is of Intake after a short Cruz and I always remember seeing condensation on metal intakedls n carbs Especially aluminum ores Does more of this condensation mean anything

[808ministroke]

okay so with all the major issues sorted out i now want to do my final upgrade for a while and that is taller gears.
unfortunately st.ca doesnt carry any piaggio gears with the outer bearing. they were nice enouhmgh to direct me to racing planet whom carries tons of the right gears so now i need help on deciding which ones to get.
first of all should i swap my primaries or secondaries? which would be easier to install? i was always afraid of gears because i would see 13/49 and think well what if my secondary Doesn' Have either 13 or 49 teeth To connect to the primaries. But somebody Told me that the numbers of teeth are Unimportant And while mash with the other gears No matter what the to count on them is is this true?

[pinkscoot]

Is this what you are looking for? scooterpartsco.com/vespa/et2/et2-drive-and-transmission/malossi-primary-15-38-gears-piaggio-2t?zenid=c9165f4cfbd0c3d073a42ae4bcc86c89. His prices are good and shipping quick most of the time.

[808ministroke]

i drained coolant today and retorqued head nuts with my newly bought first ever torque wrench.

 i finally looked down at the tach on a high speed flat run i got up to 11,600 rpm before i let off was still climbing in revs i hit 61mph.
now i know that my pipe peaks at 10,500 ish and the cypinder peaks at 13,500 rpm so i never asked this should i tune my cvt for pipe , cylinder, or somewere in between?

[aeroxbud]

The Yasuni R makes the same power between 9,500 to 10,500. I have always set my cvt up to take advantage of the maximum range. If you set your bike up to run at 10,500. As soon as the cvt is maxed out. You are out of the power band.
You will get some cross over with the higher cylinder. But the exhaust will dictate most of the power.

[Lucass2T]

Nov 24, 2020 3:59:45 GMT -5 808ministroke said:

now i know that my pipe peaks at 10,500 ish and the cypinder peaks at 13,500 rpm so i never asked this should i tune my cvt for pipe , cylinder, or somewere in between?

Pipe

Ideally, you want to put it on the dyno with a locked cvt and run it to pinpoint the torque curve's peak. That torque peak is where  you want to tune your cvt to.

The torque peak is a combination of the charactaristics of mainly the pipe and partially the cylinder. Ignition timing, reed petal material/thickness, carburetor size and some other things also influence the torque curve.

You can put some real heavy rollers in and do a top speed run. While doing so read your tacho and use your butt-dyno to determine where (at what revs) you feel the engine is pulling the hardest. Exactly that rpm is where you want your cvt to be tuned at.

[pinkscoot]

Lucas than Thank you, that is the best explanation of how to tune a 2T I have read.

[808ministroke]

appreciate the feedback you guys in going to pop back in all 5.5 instead of 5.5 and 4.0 and see were that gets me thanks you guys really helpful.

[808ministroke]

well i stripped ANOTHER bolt trying to get kicker case off will have to wait on the weights... baduum tsisss. i was noticing today how my moped seems to sputter on anything under full throttle again on n off. im worried this is what started happening early on before i fixed cylinder stud and nuts now i just recently retorqued the nuts to piaggio specs and i am not noticing any coolant loss however my pipe is once again spitting out alot off gunk. when i first put on this new pipe was riding awseome and i would notice a small amount of oil exiting the exhaust, normal right? i premix 3oz per gallon like 38/1 i think using motul 800 right now , i have also in the past few tanks been adding vp superfuckinduper stregnth octane booster which raises octane up to 7 numbers or 70 points.
after my ride just now i saw alot of gunk on my pipe and the inside of the silencer on the end was basicaly washed clean by it. can this possibly be a sign of super rich ? i am running rich by the look of my plug . what made me nervous was after smearing sum of the smudge on a finger i noticed it gad a sorta stickiness to it i wouldnt expect premix gas even with octane boost tp have a slight stick to it i would expect it to be slippery right? has anyone had a similar experience with overly rich mixture or because of coolant leak? the spark plug didnt look washed clean and if i recall burnt coolant has a distinct smell that i didnt detect.