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Author: Subject: First run
Mark O

posted on 4/11/20 at 09:27 PM Reply With Quote
First run

Gents

2.0 Zetec Blacktop now mated up to 40mm ZX9R CV carbs etc from a DanST kit. TPS fitted up and wired in to the Nodiz gen 1 (old I know) ECU module.

Took it for a first brief spin today. Air filter was off, and trumpets/stacks from the kit have been fitted - as has the bike fuel pump, the filter and a fine filter before the carb fuel inlet.

Basically it idles well and it pulls well. I did not explore the upper end of the rev range, but it seemed as if it wanted to go there.

Couple of things

Firstly - From (I think) the carb side there was a fair amount of noise. Of course I realize this may just be intake noise, but it was more of a loud contant popping sound under load - rather like a misfire rather than a loud rush of air. Pretty sure it wasn't actually misfiring as it did pull well, but I wondered if this was normal? I have not tried it with the air filter on just yet. I checked all around for any air leaks at the carb - intakes/manifold/servo offtake - couldn't see anything. If this popping noise is normal then fine - if not, what do we think is the cause? Only thing I can think of are the main jets - maybe too small, perhaps giving rise to fuel starvation or wrong mix? Plugs look fine by the by. Light brown in colour.

Secondly - If I did decide to hand it over to a tuning shop, what can they do? I guess they could play around with the Nodiz gen 1 somewhat, but what else could I expect? Could I possibly do some basic tuning myself perhaps? What do you suggest?

Many thanks

Mark

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Slater

posted on 4/11/20 at 09:43 PM Reply With Quote
I suggest you stick the air filter on and go for a drive and just see how it goes. But be very careful on damp roads, specially if you want to explore the full rev range!

Mine does not pop (1.8 zetec, bike carbs with megajolt), but I've never tried driving without the air filter on.





Why do they call Port Harcourt "The Garden City"?...... Becauase they can't spell Stramash.

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Mark O

posted on 4/11/20 at 10:15 PM Reply With Quote
Aye I will try it with the filter on. Thinking about it a little deeper, I guess the jets only control the upper 1/4 or so, with the needle controlling the mid range. I believe if the needle is grooved, then 1 groove down from the centre is a good place to start. I'll check this out. Blocking off the air "tubes" or are near the top of the carbs seems to be favoured. I'll also check the air screws. 1 turn out?
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ttalps2000

posted on 5/11/20 at 08:53 AM Reply With Quote
sounds like its running lean, the air filter will richen it up a bit.

Is the TPS working and the ECU receiving a signal? Base map or somthing near on there? Could be a combination of a lot of things!

Get it on the rollers and get it sorted, but make sure they will touch bike carbs first!

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Mark O

posted on 5/11/20 at 11:26 AM Reply With Quote
Yes - It does "sound" lean. Soemone will remind me I am sure, but if I drop the needles a notch will that richen it up mid range? Effectively you are raising the needle within the jet allowing more fuel through....I think!

Nodiz is receiving the TPS signal - that checked out.

[Edited on 5/11/20 by Mark O]

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ttalps2000

posted on 5/11/20 at 01:18 PM Reply With Quote
i dont know anything on bike carbs im afraid, used Webers in the past, but went to ITB's instead. Someone will be along shortly to help im sure.

Spoken to DANst about the issues? They have been very helpful in the past when i have contacted them

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40inches

posted on 5/11/20 at 01:33 PM Reply With Quote
What is your location? There is a company in the Sheffield area that is good with Mikunis.
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Davedew

posted on 5/11/20 at 03:54 PM Reply With Quote
Lowering the clip in the needle will richen the mixture in the mid range.

The main jets in my GSXR 600 carbs on a blacktop 2 Ltr are 1.6mm. Gives an AFR of around 12 at WOT.

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Deckman001

posted on 6/11/20 at 06:37 PM Reply With Quote
quote:
Originally posted by Davedew
Lowering the clip in the needle will richen the mixture in the mid range.

The main jets in my GSXR 600 carbs on a blacktop 2 Ltr are 1.6mm. Gives an AFR of around 12 at WOT.


Hi Dave, sorry to hijack this post, I'm using the same type carbs i think, Description
Description
.

Do you know what the std main jets are sized compared to yours being 1.6mm ?

I too have a weak mixture i think so getting your advice will seriously help me

Jason

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steve m

posted on 6/11/20 at 08:06 PM Reply With Quote
There is nothing wrong with a few pops and bangs from the exhaust, infact it was one of my favorites

That along with setting every car alarm off at 0600 on a sunday morning (exhaust on a crossflow is on the left)

Oh i wish i still had my car !!





Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at




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Mark O

posted on 8/11/20 at 07:27 PM Reply With Quote
I decided to pull and strip the carbs in any event and herewith my take

Silicon intake hoses - not a good idea I think. The silicone is far too slippery in the bores - for want of better words - to take the weight of the carbs, even when the clips are fully tightened. I've ordered some thick EPDM hose.

Float bowls full of crud. Pilot jets all blocked. No wonder it wasn't idling well or starting at all well. Will clean everything out.

2 emulsion tubes partially blocked. May well explain the popping and banging.

Air correction holes - reading around these should be blocked off and redrilled to 0.5 to 0.7mm. Will block off with 2.5mm copper wire and drill out.

150 main jets fitted. Opinion seems to be in favour of 160 - 180. Ordered 165s for now.

Needles need a shim to raise them a tad.

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Davedew

posted on 9/11/20 at 10:05 AM Reply With Quote
I never had a success using silicone hoses to hold my carbs on. Like you said their weight just kept pulling them out.
In the end I bought a set of original Suzuki intake rubbers and made an adapter manifold to fit them to the engine.

Never had any issues since with them falling off or air leaks.

I have never done any thing with the air correction holes in my carbs. But then I've never looked for them either.

I did try 170 mains in mine, but changed them back to 160's on the rolling road as the 170's were running rich.

Wideband lambda gauge for the dash was one of the best things I did as you can see instantly what the changes you are making are doing.

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Mark O

posted on 9/11/20 at 02:01 PM Reply With Quote
Dave

Yes-Silcone hoses not great supporting load. Far too elastic and pliant. Carbs are quite a bit of weight, even for rubber. May even support them from under somehow as an added reinforcement. I think I will also reduce their lenght to reduce the cantilever effect.

Lambda gauge is interesting - cheers...Normally I simply check the plug colour.

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