Have you a 853 Bigbore Kit Fitted? (This May Worry You!) - Page 2

**Rob998** · 14 Apr 08, 05:18 PM

Glad you got it sorted. Do you have to run it in?

**egypt220** · 14 Apr 08, 05:21 PM

yes mate to be on the safe side,it wont be at 60mph but just in case as it will need the heads doing before i can run it too hard.

**Mr.R** · 14 Apr 08, 06:33 PM

Quote:

Originally Posted by egypt220

yes mate to be on the safe side,it wont be at 60mph but just in case as it will need the heads doing before i can run it too hard.

Hi,
Why didn't you have the heads shimmed before it was put back together?
It's far easier to do the shims while the heads are off the bike.
The heads have to be on to dial the cams in, but this could/should have been done before running the bike.
Also if you're using the later type metalic head gaskets there's no real need to re-torque the heads IMO.
I've found that the later type none fibre gaskets don't settle any further, so don't bother anymore and I've not had a gasket failure!
The trouble is with the metalic gaskets you can only use them once, the old fibre type if they weren't damaged could be used again.
I'm looking into having made (or making myself) some solid copper head gaskets, which can be used more than once, the downside being that they will need to be re-torqued.
But at £60 the pair, I can put up with re-torquing the heads, as it costs me nothing but my time.
As an aside Bucci head gaskets (for my 955 kit) from JHP were as good as double the price,
£58 + vat each for a gasket with a 2mm larger bore/hole than a standard 916 metalic item...
So they want almost double the money for less material, which I thought was taking the pi*s!
Hence the copper gasket route.

Steve

**egypt220** · 21 Apr 08, 04:43 PM

Quote:

Originally Posted by Mr.R

Hi,
Why didn't you have the heads shimmed before it was put back together?
Steve

it only going back in to have the the heads torqued down as my mate like to make sure it is done properly.
he is not charging me for it as it all in with the price.

**CJS ducati** · 27 Apr 08, 01:17 PM

Quote:

Originally Posted by egypt220

i have a 748s big bore that i bought from a well known ducati shop,my mate who builds bike all day long was doing my bike today,
striped it down put the new pistons on slip on the new barrel and there was no hole for the dowl so he phones me and says we have a problem with your kit ?
what i say it the wrong one,no its not i said stop pulling my leg,yes it is as the is no hole locatting dowl as there are 2 and one is in the right place but the other is not.

ok let me phone the shop.

phone the shop the and the guy behind the counter was as good as gold looked everything up for me and phoned me back saying yes you have the right kit.

phone my mate it the the right kit,give me the number and i will talk to them,so i said no i will get them to ring you as if my mate says there is a problem there is a problem.

anyway the head technician tell my mate we have fitted 100's of these kits you just take the dowl out and throw it away ??? what he says but it there to line the barrel up as it could be out off line.

dont worry the technician say when you tighten it all up it lines up.

my mate says i like to build an engine properlly.

im going to talk to the manager tomorrow as this is not what i call top workmanship.

if they built your bike like this you would never know as they would not tell you,and if you have a problem down the line like a valve hitting a piston,i bet you would get blamed or they would say sorry thats just ducati's.
and then you would get charged again for a rebuild.

as i dont really want my engine to go bang as it could mean that the valve could be 10 degree's out of line with its grove in the piston.

im going to see what happens tomorrow as i want a hole for the dowl to locate into and i will have to go to an engerneering firm to do it as i would not trust them to do it before building the engine up.

if i have no joy im going to get the trading standards involved,and even the fsa as this is wrong.

update tomorrow.

Depending on what year the barrells are the locating dowel is in a different place. These small differences is what we find when building motors . Main dealers or people selling them often dont know the differences. Do not fit without the dowel.The result is increased piston and rod wear if the barrell does not sit square. I have seen it. Phone them and ask for the correct barrell (the older version) or find your original base gasket to use as a template to drill an extra hole right place on the new barrell.

**CJS ducati** · 27 Apr 08, 01:21 PM

Quote:

Originally Posted by Dan

It'll be interesting to know what 853 kit you've bought because I've heard that there are a number of companies that supply them, so I wonder if they all only have one locating dowel, or if some come with two as desired?

All 748-916 bikes had the dowel in the correct place. Then when they bought the 748r out the dowel position changed. The barrell he has been supplied with is for the R version. You can drill the hole in on a pillar drill using a base gasket as a template.

**egypt220** · 27 Apr 08, 02:34 PM

it's an 03 748s and it was supplied buy a top tuning compony(ducati) all sorted now and bike is flying.