Hi-Comps ready to drop

jklnhyde · **Posted:** Sun Oct 30, 2011 3:11 pm

I might drop the hi-comp pistons in the Paso as long as I don't have to battle too many variables along the way. I have the plastic all off to replace a dead fuel pump, so I might as well do somthing else while there. Besides replacing the timing belts and adjusting valve clearances, and head, valvetrain and base gaskets, what else should I budget for.
Yes, budget; the CBX stopped firing and the Enfield stopped carbureting. I'm low on cash; I want the Ducati to be done fast and on the cheap. Hit me!

Rick

jklnhyde · **Posted:** Sun Oct 30, 2011 6:38 pm

Arrrgh!!!! The dissassembly went without a hitch, but, SURPRISE!!, I think the previous owner had already put hi-comp pistons in! The pistons I pulled out are identical to the hi-comps I ordered, and even have the same markings underneath: 09 3528.
Can this be possible?

Rick

paso750 · **Posted:** Sun Oct 30, 2011 6:54 pm

what compression ratio are they ? The Paso 750 is already higher compressed (10:1) than ie a 750 Supersport or Monster (9:1).

G.

jklnhyde · **Posted:** Sun Oct 30, 2011 7:57 pm

Not sure of the compression, but the dome on the new hi-comp pistons is much bigger than on stock pistons I've seen. (Ebay has a couple of photos of stock and hi-comp pistons for comparison)
At this point I'd love to bore out the cylinders and go with some 90mm pistons, but can't justify the expense, so I'm going to have to put it back together as is. What's a good place to get the gaskets and seals?

jcslocum · **Posted:** Mon Oct 31, 2011 10:25 pm

Try Ducshop in Atlanta or maybe Ferracci in Philly.

jklnhyde · **Posted:** Tue Nov 01, 2011 2:55 pm

Yeah, waiting on replies from one other source. So far three other sources have been no-go for the parts I need. As for the cam pulley tool, anywhere I can find it for less than the $80 most places want for it?

Rick

paso750 · **Posted:** Tue Nov 01, 2011 4:27 pm

maybe worth a try

two on ebay
http://www.ebay.com/itm/DUCATI-CAMBELT- ... 3cbd64cfd7
http://www.ebay.com/itm/DUCATI-BELT-LAY ... 20bdf77b88

G.

Mc tool · **Posted:** Tue Nov 01, 2011 10:30 pm

jcslocum · **Posted:** Tue Nov 01, 2011 10:38 pm

Call Commonwealth Ducati in Kentucky and ask for Aldrin. Tell him Jon from DESMO told you to call. I'm sure he can help you.

jklnhyde · **Posted:** Wed Nov 02, 2011 12:57 am

Thanx for the tips, fellas'!! I'll report back...

paso750 · **Posted:** Mon Nov 07, 2011 9:49 am

paso750 · **Posted:** Mon Nov 07, 2011 10:08 am

I put mine away so I can´t measure them but here`re some HC piston that are also for the Paso. Maybe the measurements help you to identify.
http://www.kaemna.de/cms_de/katalog.htm ... tikel=2572

G.

jklnhyde · **Posted:** Sat Nov 12, 2011 2:35 pm

Well, I got a hold of the seller and explained to him the issue of Paso stock, high-comp pistons vs. aftermarket stock bore higher-comp pistons. He came back saying Paso's came with flat topped pistons as stock, with a 9:1 CR, and aftermarkets for it are domed with 10.5:1 CR. This is coming from a well known Guzzi/Ducati parts vendor/racer etc.

Should I just live with no definate answer to this question? I buttoned up the engine already, but dont know how to archive the leftover pistons, stock or aftermarket...ha,ha!

Rick

paso750 · **Posted:** Sat Nov 12, 2011 10:58 pm

He`s wrong. Let him look at the parts catalogues or the specs of the F1, let him check what`s offered used
http://www.ebay.de/itm/Ducati-F1-750-Bi ... 0868879995
http://www.ebay.com/itm/Ducati-88mm-Pis ... 3f0ff6e084
and have him google the part number:
http://www.loudbikestore.com/067047400- ... 14099.html

Aftermarket hi comp pistons are usually in the range of 10,8:1 - 12:1.

G.

paso750 · **Posted:** Fri Nov 18, 2011 9:37 am

Btw one of the Paso brochures shows an image of an open cut engine and you see the pistons there, too.

Hi-Comps ready to drop

Who is online