Struggling to sync carbs

Seeker 77 · Post by **Seeker 77** » Sat Dec 05, 2015 3:10 pm

This is the very strange problem I am having. I was trying to sync the carbs because I get these coughs when I am riding. Completely miffed by what to look at

lloydie · Post by **lloydie** » Sat Dec 05, 2015 3:15 pm

Ha ha you have to have the air box fitted and set the idle to 1800rpm

Seeker 77 · Post by **Seeker 77** » Sat Dec 05, 2015 3:17 pm

Ah, the instructions don't mention that bit!

lloydie · Post by **lloydie** » Sat Dec 05, 2015 3:20 pm

mellis wrote:Ah, the instructions don't mention that bit!

What instruction are you following ?

Seeker 77 · Post by **Seeker 77** » Sat Dec 05, 2015 3:22 pm

The ones by AMCQ. As a matter of interest why doesn't it run without the air-box? My KTM and GSXR ran fine without it!?

carmanbikes · Post by **carmanbikes** » Sat Dec 05, 2015 4:11 pm

The problems your having sound like normal, Carb Fart ha ha

Seeker 77 · Post by **Seeker 77** » Sat Dec 05, 2015 4:59 pm

lloydie wrote:Ha ha you have to have the air box fitted and set the idle to 1800rpm

Not according to these:

AMCQ46 · Post by **AMCQ46** » Sat Dec 05, 2015 5:18 pm

i get the same reading with the airbag off and on, so I say it doesn't matter.

I will have a look at the youtube and see what i can see

AMCQ46 · Post by **AMCQ46** » Sat Dec 05, 2015 5:21 pm

well its not happy to idle! were there flames coming out of the carbs? I kept seeing little flashes from the front carb when it made the noise.

could just have been the slide opening and the glint of the brass needle, but looked weird

AMCQ46 · Post by **AMCQ46** » Sat Dec 05, 2015 5:23 pm

looked again and defiantly flames..... you need to check the valve clearances as it looks like the combustion is leaking back into the inlet

Seeker 77 · Post by **Seeker 77** » Sat Dec 05, 2015 5:38 pm

This is what I feared.... I'm not worried about doing clearances, im more worried that this "9000 mile" bike has done far more.

tony.mon · Post by **tony.mon** » Sat Dec 05, 2015 8:03 pm

mellis wrote:This is what I feared.... I'm not worried about doing clearances, im more worried that this "9000 mile" bike has done far more.

Now I don't want to be at all negative, but one other possibility is that it's had a cct fail and the front inlets are slightly bent, closing up the clearances.
But on a positive note, if so that might mean that the mileage is genuine.

It's not a big one to fix, even if all four need replacing on that head, and I have valves if you need some. Just a head gasket to buy, plus some shims.

bigtwinthing · Post by **bigtwinthing** » Sat Dec 05, 2015 9:23 pm

Give it a compression test to start with.

Seeker 77 · Post by **Seeker 77** » Sat Dec 05, 2015 9:42 pm

Took the opportunity to remove the PAIR while it was all apart, that did nothing. Haven't got time to do a compression check and valve check this weekend, might take it on over Christmas leave. I find it very hard to believe that it's anything as serious as that, it runs well when it gets going and has plenty of top end. It just runs sh1t off a closed throttle when cold. I will put up with it for now until I get the time and motivation

lloydie · Post by **lloydie** » Sat Dec 05, 2015 9:44 pm

Did you block up the little pipes from the carbs to the pairs ?

VTR1000.ORG

Struggling to sync carbs

Struggling to sync carbs

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