buzzscoot
Scoot Member
Posts: 52 
Location: Georgia
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Post by buzzscoot on Jun 28, 2017 18:34:47 GMT -5
Well, I did port the cylinder some at the potential cost of screwing it up. I had read a post from some guy in Europe who had tuned several LC piaggios with dellorto 19 carbs,malossi sport cylinders, Malossi Mulitvar and TD, and Yasuni R - my exact setup.For higher performance he recommended severely rounding all of the port edges and widening the exhaust port ends 1mm, raising the exhaust port 2-3mm , and filing the inside of the port (especially the roof) smooth. So thats what I did. Can't find the post now. I did a port map of the finished cylinder but didn't do the original port map. Might post it on the port map postings.
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Post by stepthrutuner on Jun 29, 2017 3:12:17 GMT -5
In my opinion you may have gone a bit too high with ex. Port. The R probably works best with around 186 - 190 deg. ex. timing. You could be up around 193 deg. with that much grinding. You might want to see what a timing wheel tells you. You can always take away base gasket to compensate. A little more intake time may be in order. You can do this with the boost port(s). Try to stay close to the origional angle of flow and no more than a mm. probably. The "meat" of that pipe is mostly between 10 - 11k but the beauty of the R is that it still carries power well past 11,000 rpm. Stock Piaggio cranks live pretty well up to 12,000 rpm from what I've heard.
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buzzscoot
Scoot Member
Posts: 52
Location: Georgia
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Post by buzzscoot on Jun 30, 2017 6:30:22 GMT -5
Thanks for the advice. I definitely will check with a timing wheel when I have it apart next. Didn't think to check it because I didn't think the difference would be drastic. I am running in the 11,500 to 12,000 range now upon acceleration and it seems to have good power. I am doing 0-35 in around 5-6 seconds so power is there at low speed, just don't know how I'm doing at top speed. I don't think I will monkey with the cylinder yet and I'll try to get the rpm below 11,000 with cvt tuning if I can and then I'll see what my overall performance is. Here's the port map  |
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Post by stepthrutuner on Jul 1, 2017 1:24:17 GMT -5
Boost port heights look good. Tuning theory is this helps blow down the upper reaches of the combustion chamber with the cool pressurized mix from the crankcase since they open around 1mm before the transfers start gushing across the dome of the piston. The cooling effect helps trap a bit more fuel/air for increased power.
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Post by chadzilla1 on Oct 12, 2019 19:11:42 GMT -5
Im going to jump on this thread. I have a 2003 GP1 and I have a big issue !!!! I just bought a project bike $300 that didnt run but only has 6,000. That is something I'll figure out but the issue I have is when I put antifreeze in it just drained all over the floor :-( I dont have a lift so I didnt see where it was coming out from. I didnt want to get antifreeze all over me on the ground. What I do know it was coming from the left side between the engine and transmission?  ? |
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Post by chadzilla1 on Oct 16, 2019 10:18:16 GMT -5
well the vidoes are to large to email from my phone and when I log onto this page from my cell it doesnt give me the option to insert ?
Anyone have info on installing the water pump seals without splitting the case?
As for the leak on the stator side I'll have to pull the cover and see whats going on in there
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buzzscoot
Scoot Member
Posts: 52
Location: Georgia
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Post by buzzscoot on Oct 16, 2019 21:10:19 GMT -5
There are some foreign videos showing how to replace this water pump shaft seal on LC Piaggios on the transmission side without splitting the cases. I can't remember where, you'll have to search. With mine, which I have heard is common, the water impeller was screwed up so in those cases you have to split the cases or install an electric water pump.
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