Problems over 4000 rpm

[germank9]

Hello,

i've got a problem to get more than 4000 rpm and i doesn't know why.

There's a penzl exhaust and a spike air cleaner on the bike- the penzl is a exhaust thats like a open exhaust - just a catalyst, no more. 117 cui.

I knew the way to set up the carburator - (and ive read the carburator tuning guide) and so i've testet with 31 /32 intermediate and a 78 accelerator jet- the bike runs fine with this setting - but at 4000 rpm it lost very much power an fires backward. The little screw on the left carburator side is not in place (like S&S recomended)..

I've testet larger jets - 80 and 82. The same problem..

i've also testet different settings in the acccelerator screw adjustment - the same problem.

Under 4000 rpm the bike goes hard foreward when i open the throttle fast. there's no problem. But when i let the throttle open it begins at 3800 - 4000 rpm - backfire and no power..

The spike is horizontal.. has anyone a Idea what this can be???

Kind regards from the snowy germany..

Dirk

 

[outdoorsman26]

My thoughts would be in ignition, seems you have looked at the main jet correct?? at 3000rpm or so it changes to that jet so if you are getting fuel/air, run it up to 4000 and try and keep it there for a while then shut it down and look at your plugs, maybe a new coil is in order??

 

[germank9]

I'll will test it tomorrow. Wenn i drive a time in the 3'rd gear round about 4000 rpm the plugs can tell me if i'ts to lean or to rich i hope..

I've also thougt about the Ignition.. i will also check the wiring tomorrow..

we will see..

 

[firedog19]

Try turning your spike vertical. My 04 cuts out at high rims in the horizontal position common with the spike air cleaner

 

[T.Byrd]

Try turning your spike vertical. My 04 cuts out at high rims in the horizontal position common with the spike air cleaner

I agree and you might have to pull your vent screw to get it right I did.

 

[V]

Also make sure you are getting a good flow of fuel from the tank.

Do you have a fuel filter on the bike? If so take it off and try as well.

 

[Raywood]

Good call on the fuel filter V


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[germank9]

Hi Folks,

a long day on the bike - 2 Degrees celsius but sunshine.. - fucking cold.

I've fixed the problem - first i've change the Spike against a S&S Aircleaner - the bike runs fine..

When i changed back the bike still break down at 4000 rpm.

The problem is still the vent screw on the left side of teh S&S - it must be IN the carburator - also when the spike is on the bike.

The spike has a socket that constains a little chanel. I've never seen this an so i get the screw out.

When the air vent screw on the left side of the S&S ist not in place (like S&S recomendet) it seems that the airflow is extremly different - and that will cause different pressure into the carburator and the throttle chanel. I'm wondering why this works up to 4000 rpm but it is so. after 4000 rpm it seems to me that the different pressure is to high an no petrol will get into the airflow.

when i put the screw in place the problem is completly gone..

one problem still exist - the clutch won't work perfectly - but thats a complete different story...

oh ... and another problem still exist - im so fucking cooooooollllld that i will never get warm again - but it was a nice ride..