starts bogging 4-5000 RPM

Licardo.smit · Post by **Licardo.smit** » Sun Aug 25, 2013 12:22 pm

Hi all,

hope you guys are well,

its nice day in jhb, South africa and i took her for a ride so as she was warmed up i took her to 180KMH and stopped at the red light,when i pulled of it starts bogging between 4-5000 RPM,

the mech i take my bike to has fixed it 2 weeks ago(was doing exactly this) said he cleaned the earths,coil and redid the carbs,

has anybody had this issue before?any help would be a preciated,

thank you in advance

magg · Post by **magg** » Sun Aug 25, 2013 1:08 pm

If the "bogging down" continues through the rpm range above 5000rpm, you may have speed limiter issue. Most NC30s have a 180kph speed limiter that is sensed by the ignition unit at start up. If the ignition unit does not sense the limiter it stops the ignition signal to the rear cylinders above 5000 rpm.

The speed sensor is located in the speedo and can be bypassed if it develops a fault.

Licardo.smit · Post by **Licardo.smit** » Sun Aug 25, 2013 2:08 pm

Thx ill try it

magg · Post by **magg** » Sun Aug 25, 2013 2:25 pm

I should have been more specific, when I said "bypass" I was refering to the de-restricter mod in the documents section on this site.

Licardo.smit · Post by **Licardo.smit** » Sun Aug 25, 2013 7:16 pm

Thx will forward on to the mech,

Licardo.smit · Post by **Licardo.smit** » Mon Aug 26, 2013 6:48 pm

So i was on my way to the mech to drop her of and all of a sudden the problem was gone!!!! running sweet again,

i still left her with him but its weird, must be an electrical problem?

Licardo.smit · Post by **Licardo.smit** » Tue Aug 27, 2013 6:13 pm

Hi guys, I come with bad news, after the bypass as per the document section it was fine for 5 km then when I wacked it to about 140 km/h it started bogging down again

I did the tap vac bypass, would cause a problem? Its not leaking,

Any other ideas

magg · Post by **magg** » Wed Aug 28, 2013 10:46 pm

What in the " tap vac bypass", do you mean the HRC modification?

Licardo.smit · Post by **Licardo.smit** » Mon Sep 02, 2013 12:07 pm

yes Sir, thats the one,

went for a 140km Ride yesterday and she ran beautiful, did some cuzing, went flat out, quick pull off's no trouble what so ever but i still in my mind wonder when (and if) its going to happen again,

Post by **skinnydog0_0** » Mon Sep 02, 2013 9:03 pm

I bet you it's the rubber diaphram in the fuel tap. If you take the tap apart you will most probably find the rubber diaphram has become seperated from the plastic disc, and is getting stuck in the flow of the fuel after you have been running at speed. I have had this happen a few time on my race bike. Easy fix

starts bogging 4-5000 RPM

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