Dolkita BB kit dissapointment..

roncoinc · Jun 8, 2010

After reading all the horror stories about the big block kit for the dolmar i went and ordered one anyway..
expecting to make a lot of use of my dremel tool to make it acceptable to use,i have found myself dissapointed !!

looks like all i can do is a little mild porting and "maybe" polish the intake a little..
as it is it looks like a bolt on and run as is ..
i am NOT dissapointed in the quality of the kit,i think it is pretty darned good !! i could find NOTHING to complain about,especially for the price. i found NO pits in the plating,a couple "lumps" in the ports i may smooth out but overall pretty darn good !!
It seems to me anybody waiting for the quality to be acceptable need wait no longer

sorry for poor quality pix but lighting setup failed on me

when they painted it some got on the inside on the compression area and is reflected in several places..

SkippyKtm · Jun 8, 2010

i am NOT dissapointed in the quality of the kit,i think it is pretty darned good !! i could find NOTHING to complain about,especially for the price. i found NO pits in the plating,a couple "lumps" in the ports i may smooth out but overall pretty darn good !!
It seems to me anybody waiting for the quality to be acceptable need wait no longer

Good advice!~ I bought a kit a few months ago and had the same experience -the kit was top notch. :cheers:

AUSSIE1 · Jun 8, 2010

Yeah does look very nice Ron.

Shame they couldn't add to the skirt width a little on the kit pistons.

The kits can have slightly different timing to the OEM's so you could still have a little grinding if you wanted to.

:cheers:

roncoinc · Jun 8, 2010

AUSSIE1 said:
Yeah does look very nice Ron.

Shame they couldn't add to the skirt width a little on the kit pistons.

The kits can have slightly different timing to the OEM's so you could still have a little grinding if you wanted to.

Hey man,,any suggestions on where and what to grind are MORE than appreciated..
add to the skirt to widen the intake ??
is the "slightly diff timing" on the intake or exhaust ? or both ?
tnx al..

roncoinc · Jun 8, 2010

SkippyKtm said:
Good advice!~ I bought a kit a few months ago and had the same experience -the kit was top notch.

Did you do any work on it at all ?? or use it as is ??
how did you like the way it runs ??
tnx..

jnl502 · Jun 8, 2010

yea that looks nice. glad they got the issues worked out. guess it's about time to make an order myself.

SkippyKtm · Jun 8, 2010

roncoinc said:
Did you do any work on it at all ?? or use it as is ??
how did you like the way it runs ??
tnx..

I remember reading a post from sneller saying there wasn't much that could be done with it. I believe he ran into the same issue you're having. My saw is actually a DCS6401 (Home Depot special) so I was happy just to get it to 84cc. The comp is at 145 now and the squish is .039 so I might run it gasketless as long as the squish is greater than .020.

madman39 · Jun 8, 2010

I like mine! :clap:

AUSSIE1 · Jun 8, 2010

roncoinc said:
Hey man,,any suggestions on where and what to grind are MORE than appreciated..
add to the skirt to widen the intake ??
is the "slightly diff timing" on the intake or exhaust ? or both ?
tnx al..

Dunno Ron.

Never seen a Dolkita in the flesh let alone a kit.

With the Husky kits the timing has been conservative compared to OEM, but I had OEM's to cross reference against even with a rule or verniers if not by wheel.

Maybe someone with an OEM cyl off can take measurements with a rule or verniers for ya.

The windows can be opened up some.

Ports in some of the kits are oval and can be opened in the corners to gain some area.

Unshroud those lowers mate.

:cheers:

MCW · Jun 9, 2010

AUSSIE1 said:
Never seen a Dolkita in the flesh let alone a kit.

I'll send you one to have a crack on Al, seriously

weimedog · Jun 9, 2010

looks like they left you plenty of material to grind in the exhaust and around the web in the transfers. wonder how it compares to stock. Any side by side pics?

mtngun · Jun 9, 2010

The dark ring at the very top of the bore looks like missing plating and/or a gouge. It shouldn't cause a problem on this particular application, since the single ring piston has a generous top land, but I'd like to see the top-of-the-bore problems fixed on the Stihl kits.

Thanks for the report. I'll see if it'll let me rep you.

blsnelling · Jun 9, 2010

Here are the port timings from a OEM 7900 and a 7900BB.

7900 OEM
Exhaust 102
Transfers 130
Intake 75

7900BB
Exhaust 103
Transfers 127
Intake 81

roncoinc · Jun 9, 2010

mtngun said:
The dark ring at the very top of the bore looks like missing plating and/or a gouge. It shouldn't cause a problem on this particular application, since the single ring piston has a generous top land, but I'd like to see the top-of-the-bore problems fixed on the Stihl kits.

he black ring appears only in the pic,,my photog skill and lighting leave a lot to be desired..it is smooth and i cant feel anything..
the plating does stop short of the very top but well above ring travel..
overall pretty darn nice..

Brad,,tnx for the numbers,i imagine they will change if i lower the squish..
any "non binding" ,at my own risk,i wouldnt do it if it was me,,type of suggestions if i do lower the cyl to correct the port timings ??or what would be better numbers without getting carried away ?? of course for informational purposes only...
tnx..

blsnelling · Jun 9, 2010

Every .010" you lower the jug is only about 1° change in port timing. So you're not going to change much at all tightening the squish.

roncoinc · Jun 9, 2010

AUSSIE1 said:
Dunno Ron.

Never seen a Dolkita in the flesh let alone a kit.

With the Husky kits the timing has been conservative compared to OEM, but I had OEM's to cross reference against even with a rule or verniers if not by wheel.

Maybe someone with an OEM cyl off can take measurements with a rule or verniers for ya.

The windows can be opened up some.

Ports in some of the kits are oval and can be opened in the corners to gain some area.

Unshroud those lowers mate.

Unshroud lowers ? i must have been absent that day

dont know what that means ..
tnx..

AUSSIE1 · Jun 9, 2010

Open up the lowers Ron

AUSSIE1 · Jun 9, 2010

MCW said:
I'll send you one to have a crack on Al, seriously

Sorry mate, only just spotted this.

Ha ha, mate if you must, lol.

I spose I could get a couple of vids of it in some peppermint, that or wait for a GTG.

It would be nice to give one a run Matt.

If we do do the GTG thing, Spring would be a good time and give people including those from NA that would like to make the trip (our buck could be down around 75c by then :dizzy:

), a chance to organize.

:arg: Sorry Ron.

CHEVYTOWN13 · Jun 9, 2010

Looks good Ron.

The lower transfer port ducts look just like the 7900's.

Are you going to go wide on the intake/exhaust ports?

Can you take a picture of the transfers?

roncoinc · Jun 9, 2010

CHEVYTOWN13 said:
Looks good Ron.

The lower transfer port ducts look just like the 7900's.

Are you going to go wide on the intake/exhaust ports?

Can you take a picture of the transfers?

Will try to get a couple more pix tomorrow..
the piston skirt dont look wide enough to do much on either in or out,maybe 20thou only on each side to work with,not leaving anything,will measure..
i havent seen one like this that dont seem to have a whole lot to work with..the piston skirt just dont seem wide enuf !

Dolkita BB kit dissapointment..

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