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Post by hellish100 on Jan 14, 2018 1:52:51 GMT -5
It’s like jogging while breathing through a straw. Your heart beats just as fast but you can’t breathe worth a damn. You got the fake news.
Get a carb that supports the mods you already have.
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Post by ultrasuede on Jan 14, 2018 15:04:00 GMT -5
![21mm carb it is! Any recommendations on which one? Is motoforce any good?]()  21mm carb it is! Any recommendations on which one? Is motoforce any good? Also, just washed the case. Looks like a new engine |
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Post by Lucass2T on Jan 14, 2018 15:31:26 GMT -5
Genuine Dellorto PHBG. Affordable, easy, simple, lots of tuning parts and they are widely available, fits right in your stock intake boot and the stock airbox housing. I don't like the carbs sold under a 3rd party name like motoforce, stage 6, OKO etc etc. Can't really tell of they're (expensive) knockoffs, copies, replica's and whatnot or not. I like to keep with the genuine stuff, can't go wrong on that!
edit: about the intake boot and airbox..that goes for minarelli. I don't know what piaggio will accept.
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Post by pinkscoot on Jan 14, 2018 15:48:20 GMT -5
There are a number of adaptors available for the Dellorto PHBG to fit other air boxes.
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Post by ultrasuede on Jan 18, 2018 5:20:59 GMT -5
 Crank all fitted and case back together. I had some trouble with the seals. They sit right up on the bearings and stop them from spinning. There is no space between them. I had to take them back abit. Is this right? |
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Post by 'O'Verse on Jan 18, 2018 12:33:57 GMT -5
Technically no. Your seals should not touch your bearings. And if they do. They should definitely not stop your bearings from spinning. Maybe one of the Vespa guys can chime in here. Are your seals flush with your cases when there touching your bearings?
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Post by 90GTVert on Jan 18, 2018 14:00:06 GMT -5
Not sure what those cases are like, but many will allow you to drive a seal all the way against a bearing... but that doesn't mean that you should. Usually you drive them in so they're flush with the outer edge of the case and then stop unless there's some feature that denotes a different scenario like a retaining clip for example.
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Post by aeroxbud on Jan 18, 2018 15:11:30 GMT -5
Ideally you would measure how deep the old seals were before removal if they are recessed at all.
Some of the Piaggio engines do have the seals recessed a bit.
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Post by ultrasuede on Jan 21, 2018 2:53:59 GMT -5
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Post by ultrasuede on Jan 21, 2018 3:02:04 GMT -5
Today was the assembly day. So happy it's over. Had a huge problem with the belt that i'm hoping to get advice on. The stock belt is a 18.5 X 732. I replaced it with a "racing" 720 x 18.7 x 8mm kevlar belt. The thing ran like a sloth tumbling down a slight hill. This was with the stock variator and clutch. I put the stock belt back in and she ran fine. I can't find a stock belt size in kevlar. Do the belts have to be paired with specific variators and clutches?
Also, onto the variator. I bought a polini hi speed variator that doesn't fit. It even has my scooter model printed on the box. But the variator shaft doesn't fit over the crank. It's got a good 1mm of clearance around the crank. The stock one fits snug as a bug. I can't use the stock one with the polini one as it is too small for the variator. Any recommendations?
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Post by moofus02 on Jan 21, 2018 7:19:16 GMT -5
12mm shorter belt is a lot. I would run a good quality regular belt. The Kevlar belts can make a mess when they break. One of the guys here had a Kevlar belt break and bent the variator side of the crank when it did
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Post by 90GTVert on Jan 21, 2018 7:44:55 GMT -5
You would be better off with a stock replacement belt of the correct size than worrying about kevlar. Short belts don't allow full travel. They can't get the best ratio at takeoff or for top speed, so they limit you in both of those ways and will change the overall characteristics of the CVT. The right belt can make or break the whole setup.
Might want to contact the seller or lookup Polini model numbers or contact Polini about the variator. Could be a fluke, like the wrong part was boxed. Could be something else. I'm not real familiar with the Piaggio platforms to give much specific advice there, but hopefully one of those sources or other forum members will be of better assistance. If you end up contacting those sources, you may also want to ask if they offer a belt for you application.
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Post by pinkscoot on Jan 21, 2018 10:45:14 GMT -5
The reason your variator doesn't fit could be because you replaced your crank. Does the Polini variator fit on the old crank?
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Post by ultrasuede on Jan 21, 2018 10:55:57 GMT -5
Thanks guys, I'll stick with stock belts. I ended up buying a stage6 variator last night. The Polini variator didn't fit the old crank either.
I have noticed that when I hold her flat, it will backfire and have a slight loss of power, but runs fine if I hold off just a little. I'm guessing I may have a vacuum leak in the manifold. I don't have to mess with the timing do I? Because I left that where it as
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Post by ultrasuede on Jan 23, 2018 15:07:13 GMT -5
Update
I fixed the belt issue. I just put some shims on the variator shaft. Works a treat now! I also put in the strongest clutch springs I had, lightened the variator weights to a mix of 5.4g and 3.8g and upsized the carbie main jet and drilled out the idle jet by a smidge. The thing runs amazing now. I'm still using the 17.5mm carbie at the moment but only because I'm waiting for my 21mm stage6 flat slide carbie to get here.
Next will be the new carbie, new variator and Reed valve.
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