Super Dio ZX AF28 and other Dio scooters

sanjuro · Post by **sanjuro** » Tue May 11, 2010 10:05 pm

I checked the plug today, and it was completely soaked and dark. I first went down to a 30 slow jet and kept the 165 main in there. It wouldn't idle very well and the new plug I put in there ended up being very dark too. So, this evening I went all the way down to a 25 slow jet and 160 main. It ran very well and idled better than the previous setups.

Gotta say, the Burial pipe with it's tiny 22mm inlet at the flange likes the jetting real low. Also, I have to take back what I said about it being quieter than the PG Typhoon. It's got a very sharp wrrraaaaahhhh sound to it after 5mph.

z50r-ghost · Post by **z50r-ghost** » Wed May 12, 2010 11:00 pm

Victor,

sounds mean as *, dude. Thumbs waay up on scoring the burial pipe!

Snowman94 · Post by **Snowman94** » Wed May 12, 2010 11:23 pm

that thing is sweet!

sanjuro · Post by **sanjuro** » Thu May 20, 2010 12:02 am

Well, the motor was running beautifully when I down jetted to a 20 slow jet and 155 main jet using the Burial exhaust. The bike idled and there was no bogging, but every once in a while recently it would soft seize. It did it again after a 20 minute ride, and I decided to have a closer look:

The arrow points to an indentation in the cylinder crown.

fightingplankton · Post by **fightingplankton** » Thu May 20, 2010 12:11 am

duct tape!

Wheelman-111 · Post by **Wheelman-111** » Thu May 20, 2010 12:16 am

Greetings:

Sorry, Sanj! What spark plug?

Dude, weren't you running like a 40 Pilot at one time? When'd ya get down to a 20?

F3 Nikasil liked a 25/165.

sanjuro · Post by **sanjuro** » Thu May 20, 2010 12:27 am

The 40 slow jet was with the PG Typhoon pipe, and when I used that on the Burial pipe the plug was soaking wet.

The spark plug I'm using is the BR8HSA.

bakaracer · Post by **bakaracer** » Thu May 20, 2010 12:37 am

I think I see where your extra air might have came from.the vacuum nipple caps.one of them has some big cracks on them.plus I think that pilot was way to small. Are you straight premixing too?

veedubh20 · Post by **veedubh20** » Thu May 20, 2010 12:41 am

the rubber vaccum cap has hairline crack/ tiny vacuum leaks will cause to run lean.

20 p jet is small and cause motor runs hot.

it is a wrong plug to run BR8HSA.
b8hs or b9hs.

sanjuro · Post by **sanjuro** » Thu May 20, 2010 1:03 am

bakaracer wrote:I think I see where your extra air might have came from.the vacuum nipple caps.one of them has some big cracks on them.plus I think that pilot was way to small. Are you straight premixing too?

Yes, I was straight mixing a 32:1 ratio. Also, I recently switched to Motul 710 about four tanks ago.

I just checked the vacuum nipple caps. They have cracks in them, but the cracks are on the surface only. I'll jbweld those vacuum nipples to get rid of any possibility of leaks at those points.

sanjuro · Post by **sanjuro** » Thu May 20, 2010 1:05 am

veedubh20 wrote:the rubber vaccum cap has hairline crack/ tiny vacuum leaks will cause to run lean.

20 p jet is small and cause motor runs hot.

it is a wrong plug to run BR8HSA.
b8hs or b9hs.

Yeah, I just got a 22.5 jet in, but hadn't installed it:-(

I'll order a bunch of B8HS plugs, and thanks for all of the advice/tips.

Wheelman-111 · Post by **Wheelman-111** » Thu May 20, 2010 1:18 am

Greetings:

Only for you, a one-time offer of Skillful Japanese repair to get you back on the road.
Maybe this is just Nature's way of lowering your compression?

And where, pray tell, does one procure said #9 plugs?

sanjuro · Post by **sanjuro** » Thu May 20, 2010 1:26 am

d***, and it was running so well.

Trafficjamz · Post by **Trafficjamz** » Thu May 20, 2010 1:33 am

sanjuro wrote:d***, and it was running so well.

They always do right before this happens.

Too lean slow jet.

veedubh20 · Post by **veedubh20** » Thu May 20, 2010 1:35 am

all premix oils has differ feels by finger rubing, some are thin or thick.

thin oil need more oil Thick oil just less oil.

Running differ oil brands make hard to tuning on jetting..

use same oil running and easy to tune on carb jetting.

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Super Dio ZX AF28 and other Dio scooters

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Skillful Japanese Repair

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