Leak Down Test (Don't Laugh!!)

click · Apr 23, 2019

jimbo said:
retorquing hot or cold?

Thanks for the reply.

When you say "it amazed me how much the fasteners would turn each time."

are you adding to the torque and not backing off & then re-torquing again?

Fast Eddie · Apr 23, 2019

Back off and re torque, but noticing the wrench went further on the retorque, sometimes a lot further!

As an aside, last time I rebuilt the top end I took advice from an ‘old hand’ and over torqued them a little on assembly. But others have warned this could lead to issues.

Fast Eddie · Apr 23, 2019

Click, is a stock gasket ok with a 79mm bore?

click · Apr 23, 2019

Fast Eddie said:
Click, is a stock gasket ok with a 79mm bore?

Jim C. said it would be OK, I didn't notice any overhang when test fitting the CH gasket on the barrels.

Fast Eddie · Apr 24, 2019

click said:
Jim C. said it would be OK, I didn't notice any overhang when test fitting the CH gasket on the barrels.

Cool.

click · Apr 26, 2019

I've sorted a few electrical problems (RH switchgear).

I've got spark on both cylinders, everything is back together BUT my battery is dead, I think I left the ignition switch on & it's been sitting for 6-7 months!!! Tried smart chargers, normal chargers but it's totally dead, only 1 year old & barely used!!

I have a new battery ordered, hopefully my next post will be a video of the 880 running!

Fast Eddie · Apr 27, 2019

“My Kingdom for a horseshoe” !

click · Apr 27, 2019

Fast Eddie said:
“My Kingdom for a horseshoe” !

"For want of a nail"!!!

click · May 3, 2019

OK guys, here you go, did it blow up? did the pistons shoot up through the cylinder head?

gortnipper · May 3, 2019

Nice. Did you put in a new cam? If so, dont let it idle below 2500 for the first 20 min or so.

click · May 3, 2019

No new cam, just barrel, & custom pistons

I'll re-torque head, sort the carbs as they were setup for the 920, tighten up a few more bits & then a road test, can't wait!

cliffa · May 4, 2019

Great news click. The bike sounds good, I’ll bet you are relieved.

Cheers,

cliffa.

click · May 6, 2019

Thanks cliffa, relieved is one word you could use

Bank holiday here so got the bike ready this morning & went for the 1st 50mile spin.

Lots of blasts from 30-50MPH & 40-60MPH and a few 50-70MPH, kept the revs below 4K.

Bike is running great, slight hesitancy at very low throttle pull, I'll clean out the pilot jets & see if it improves.

Some video below of bike ticking over.

Here's some shots of the plugs, what do you guys think??:

RH plug has a bit of soothe on top ring, porcelain is white, tip is grey

LH plug has a cleaner top ring, porcelain & tip is the same as the RH plug.

Here's the video:

Peavey Jeltz · May 6, 2019

Click, thanks for keep up this thread. I'm chasing a similar problem on my Atlas. Gives me encouragement that I'll get it sorted out. It does run and ride well until the right side plug starts to oil foul.

gortnipper · May 6, 2019

Check to see if your float and needle heights are even.

Peavey Jeltz · May 6, 2019

Single Monoblock, so that's definitely not the issue and it's puffing white smoke not sooty. I've got the thing apart now and both cylinders were pretty loaded up with oil, more than I'd expect find after tearing off a head. Taking measurements and working up a whole new thread 'cause this un's long enough.

Leak Down Test (Don't Laugh!!)

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