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Post by partanen on Jul 29, 2014 16:27:21 GMT
Float needle is new.
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Post by partanen on Jul 29, 2014 8:38:00 GMT
Is it normal that some fuel enters at the bottom of carb bowl? And then it leaks thru mixture screw rubber and mess up the engine with fuel.
First I thought it's oil as I have had some leaking problems, but now I found out it's fuel.
I have 122 main jet, could it be too large? Engine cannot suck that much fuel maybe?
I could try 120 main jet but I cannot find it at the moment.
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Post by partanen on Jul 5, 2014 8:14:22 GMT
Terve vaan, tässähän mä naapurissa Länsi-Vantaalla.
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Post by partanen on Jul 3, 2014 20:36:16 GMT
I'm satisfied as I have Sip Road 2.0 exhaust pipe. That's good enough and I'm not about to purchase any tuning cylinder at the moment. I could afford propably, but stock cylinder's low end torque is what I like the most. And the reliability. I quess it works forever.
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Post by partanen on Jul 3, 2014 15:38:39 GMT
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Post by partanen on Jun 29, 2014 8:31:17 GMT
Isn't there a difference between hard braking and emergency braking?
For me it's a habit to look at what's happening behind me (if I have time) when ever I need to brake. Maybe it's because I rode 70 000 km/year for 13 years in my previous life. Never got rear-end collision, but I changed lane many times to reduce possibility of rear-end collision. You can never know if driver behind you is fiddling with his phone or himself while driving. With scooter it's even easier to dodge between cars in front of you.
Believe me, if it was a truck which is coming behind you, he started braking a lot before you did. For them it's a work, they know how to drive.
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Post by partanen on Jun 28, 2014 18:03:57 GMT
40/120 idle jet, and mixture screw is 2 - 2.25 turns. It's starting to feel like I want it to be. Not much four stroking when I ride slowly at fourth gear. Let's see how it goes if we ever get warm weather at this summer again.
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Post by partanen on Jun 28, 2014 17:59:16 GMT
Yes Cuppini vibrates as much as originals, if not more, when standing stationary engine idling. Mirror stem is 10mm on both. When riding Cuppini is ok.
I wouldn't ride without mirrors. If I ever have to brake hard I like to know what's happening behind me.
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Post by partanen on Jun 23, 2014 7:59:48 GMT
Close but fits with Cuppini brackets:
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Post by partanen on Jun 21, 2014 11:20:49 GMT
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Post by partanen on Jun 17, 2014 6:51:01 GMT
I have BGM "faster" flow tap installed, as last winter I though I want Malossi kit, which I don't need at this moment: Original tap is a bit weird. At first fuel goes down, then up, and down again. Inside BGM tap fuel goes down, sideways, and down again. That was biggest difference as I see it. I also have bigger inner diameter fuel hose (8mm), as I thought 6mm is quite small. I have drilled the hole from float chamber to jet stack up to 2mm. So I think fuel delivery is in good stage. I only have this slight four stroking when cruising about 40-50km/h at fourth gear. I could twist more throttle, or change third gear to get rid of it. Call me perfectionist, but I want to try if I could get rid of it by fine tuning the carb. My tuning book says that mixture needs to be is a lot richer at idle speed than it is at partial throttle. So to me it feels like I have rich idle mixture at use still when I twist the throttle a bit. I could try to mod the slide, but there is no room to take the slide out when carb is on its place. And I don't want to use old gaskets when I install carb. So at this point it's easier to change idle jets, which will arrive later on this week. I cannot get good enough results by turning mixture screw.
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Post by partanen on Jun 16, 2014 19:09:59 GMT
Thanks guys. I'll wait and try new idle jets as soon as they come. I believe it's possible to fine tune the carb with factory made components. My original idle jet is 55/160. Screw is opened about 1.25 turns or so, with 50/140 idle jet. From here I got the idea to try different idle jets: modernvespa.com/forum/topic77895
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Post by partanen on Jun 16, 2014 16:28:39 GMT
This is getting even more interesting. I only wish I was measured both heads, but I didn't have proper equipments that time. Anyway MMW sits closer to cylinder. At least I can always go back to original as I have untouched original head at my garage. That's why I do not regret that I bought MMW head. Until I see holed piston.
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Post by partanen on Jun 15, 2014 16:15:37 GMT
I forgot to mention that ignition timing is at 20 degrees now. Getting better.
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Post by partanen on Jun 15, 2014 16:13:54 GMT
To me it looks like float level is fixed and cannot be altered. At least I haven't done anything for it, but change a new needle.
I ordered several idle jets and I'm expecting them to arrive next week.
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Post by partanen on Jun 15, 2014 15:12:00 GMT
I didn't want to mess up the sticky with my theory, so I borrow this thread. If latter number is smaller it will reduce overlap between the slow running jet and the main jet stack.
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Post by partanen on Jun 15, 2014 15:06:23 GMT
When you measured stock head, was it older or newer model? I thought you wrote about older model. Older PX 200 had higher compression ratio, maybe 9.8:1 ?
I haven't found older model head so I bought MMW. I'm gonna buy older head if I can find one.
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Post by partanen on Jun 15, 2014 10:28:14 GMT
Yes I have air filter with opened heart shaped chamber. Old filter wasn't opened. Now four stroking appears when I open the throttle just a little bit while riding. It was worst with original idle jet, but got better with 50/140 idle jet. So I just thought if it got something to do with opened air filter. As idle jet and main jet stack took air from same chamber earlier.
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Post by partanen on Jun 15, 2014 8:35:50 GMT
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Post by partanen on Jun 15, 2014 8:01:35 GMT
Could this mod mess up transition between idle circuit and partial throttle circuit? I'm asking because I have annoying four stroking at transition. I managed to prevent it by changing idle jet which have smaller air jet (140).
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Post by partanen on Jun 14, 2014 19:02:45 GMT
I have 1/4" and 1/2" only. 1/4" for small nuts and bolts (up to 13mm), and 1/2" for bigger ones (10-32mm). 3/8" is somewhere between. It's not my favorite, because it does not suite my needs. I do have adaptors from 1/4" to 3/4", and 3/4" to 1/2", just in case. My spark plug socket is 3/4", but I cannot say why.
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Post by partanen on Jun 13, 2014 16:29:08 GMT
That's my plan. I have one problem. What ever tweaks I do, I cannot test it at the same day. It's not allowed drink and drive. Or even ride.
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Post by partanen on Jun 13, 2014 9:36:50 GMT
"tinkling" actually translates well into finnish , by google translater. Yes, that's the sound. I have not heard it yet then. Sierra burned head gasket pretty soon when it pre-ignited.
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Post by partanen on Jun 13, 2014 9:31:12 GMT
Its no suprise there is no significant power improvement. This head has a larger volume than a stock head (but only 1cc) = less compression. Vespa PX owner's manual says compression ratio is 8,8:1. So I though that 10,5:1 would be a bit more noticeable than it is. I had ignition at 18 with stock head, then I put MMW head. Engine sound is a bit different, but I didn't feel other differences.
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Post by partanen on Jun 11, 2014 18:33:27 GMT
Not yet. Timing is 18 (+/- 1) at the moment. I'm trying to hear if it's knocking, but I think it's not.
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Post by partanen on Jun 11, 2014 17:59:06 GMT
Drilled air filter, Sip Road 2.0 and MMW cylinder head.
I found that idle jet with smaller air jet works better than stock 55/160. I have now 50/140, and four stroking isn't so bad. There is still some four stroking at transition, so I ordered more idle jets. Let's see how it goes.
*********
I'm pretty sure that pump actually pumps oil in to the engine. I bought a new pump last winter and I learnt how it works. Shaft turns when engine is running. Throttle position affects how much oil is pumped because shaft goes up and down when engine turns. Looks like it's hard to explain.
*********
Edit: Main jet is 122 at the moment.
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Post by partanen on Jun 10, 2014 19:05:46 GMT
pre-detonation/pinking, how easy it is to hear if it do so? I've heard pinking too many times when I had Ford Sierra with turbo charger. But I haven't hear how 2 stroke sounds if it's pinking. Is it the same kind of sound?
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Post by partanen on Jun 10, 2014 18:59:06 GMT
I went back to original 04. Only difference I could see is that 06 has no air pocket under the slide like 04 have.
One other thing came to my mind. If and when I don't have to twist the throttle so much with 06, then oil amount delivered to the engine is lower. As I have oil mixing device in use. Not so good I thought.
From now on I think I try to find another way to get richer ratio at part throttle. Another emulsion tube maybe.
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Post by partanen on Jun 10, 2014 11:28:32 GMT
After spending 5 hours online to find solution for this problem, I have to bother you guys again. Sorry. Vespa PX200 2003. Original throttle slide was number 4. As Sip recommend slide number 6, I tried it, to improve mid range fuel mixture. Now my carburettor works great at mid range. But at low speeds it's four stroking almost all the time. I have turned mixture screw in and it's only one turn out at the moment. I was hoping someone of you have already struggled with these? Should I order smaller idle jet (-s), or go back to original throttle slide? This number 6 gives nice oomph at midle throttle, but at slow cruising it's annoying. Or is there even better throttle slide? Thanks in advance
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Post by partanen on Jun 10, 2014 8:01:45 GMT
I now have MMW cylinder head with o-ring for stock PX200: www.sip-scootershop.com/en/products/cylinder+head+mmw+px200+for_13013935No problems with starter, it turns the engine just like it should. So I use kickstarter only when someone is watching. Better performance? Not much, if at all. I have not tried top speed yet, because I'm still trying to find correct carb settings and jets. I think it worked better when I had stock cylinder head with 23 ignition advance. With MMW I use 18 ignition advance.
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