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Topics - Jimmyuk

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Downtown 300 / Headlights
« on: November 14, 2012, 05:03:50 PM »
I`ve noticed that there seems to be 2 different layouts for the headlights.
On mine the low beam is the lower projector headlights,high beam is the top most set.
Is this a country specific thing,or year specific?
Reason i ask is that even though the light emitted by the projector beams is good,from other road users view,they don`t seem very bright,and as such dont get noticed as much as normal headlights.
High beam is fine and far brighter from another road users view.
I think from a safety perspective i would rather have the normal lights for low beam with the projector beams for high.

Jim

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Downtown 300 / Flat spot/hesitancy/surging at 4500/5500 rpm
« on: November 14, 2012, 02:47:58 PM »
Hello all,first of all i would like to introduce myself as a new DT300 owner from the UK,my names Jim.
I bought the DT from a member on here...Frankie1949 i believe.
After the purchase i was aware of a few faults with the bike,namely the wandering steering and a terrible flat spot/surging at about 4500rpm that co-incided with 35mph,these problems were a right royal pain in the butt.
However the steering problem was quickly fixed,this was not the tyres or pressures,it was the head bearings themselves,they were notching in the central position.
A strip down and cleaning and re greasing has elimated the wandering ,imprecise steering and now tracks good even with 70% worn rear.
The hesitancy/surging problem was really killing my enthusiasm for the machine and was making it impossible to ride the bike smoothly at low throttle openings.
After doing some google searches it became apparent that there was quite a few DT owners with this problem,but nothing in the way of a fix.
So i set about having a good strip down to check for anything untoward in the fuel injection system.
Plug is a iridium and fine,oil is fresh,once past the hiccuping at 5500 it takes off like a banshee,so fuel pressure must be ok.
Disconnected all the sensors and the injector itself,ended up with the dash displaying 3 different sensor failures  ;D eek...panic stations...how the bloody hell do i get rid of these then....managed to do it eventually....phew.. :D .
Anyway after checking all connections and the injector etc....it became apparent that one of these sensors....the MAP sensor(the one with the locking tab on it) had a direct effect on the running of the bike depending on its position.It can be rotated through 180% more or less.I reset this position to the maximum engine speed obtainable (ticking over).
Put the bike back together and tried it out.......Well i cannot believe the transformation it has now got a beautifully linear throttle response all the way to 6k were theres a tiny bit of a flat spot and then continues as it should.
Absolutely NO trace of the hesitancy/surging at the 4500/5500 range and has restored my faith in the machine.

Obviously this may not work for everyone but it certainly worked for me.


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