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Harris Magnum 2 GSX1100


Spongebob

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So this thing hates me! Fitting the bodywork at the weekend i noticed one of the fuel taps was loose so I give it a little tweak to tighten and guess what....

Stripped thread on the tank which would also appear to be made of cheese.

Options as i see it (thanks to all on Harris forum on Facebook)

1) Block damaged outlet and run carbs off a single outlet - will it flow enough fuel? 33 CR carbs, 1170cc, fast road cams

2) Drill and tap both holes to 1/4 BSP and use air line taps instead of standard Paoili fuel taps?

3) Cut both existing fuel outlets out of the base of the tank and replace with a plate with suitable fixing to allow use of Pingel dual outlet tap?

Answers on a post card to....

What else can go wrong with this build?

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  • 3 weeks later...

Fuel tank is back. Mike drilled and tapped to 1/4 BSP and I have a spare tap from my Moto Martin in there as it uses same thread. Took an age to get taps pointing in the right direction so I could a) turn them on and b) connect the fuel pipes without fouling the frame or rear shock.

I've bolted the seat unit on properly and the tank is now fitted. Spotted another design flaw.....

How do you turn the chokes on? Luckily CR33 carbs used will eventually start with out choke.

Put a liter of petrol in the tank to check for leaks. Cant see anything obvious.

Started engine up and let it run for about 5 mins. No oil leaks I can see. Sounds good. Revs pick up well but dont drop off so well so carb balance possibly?

Final observation is ignition key. We mounted it under the electrics tray and above the cylinder head. After 5 mins of tick over it was rather hot.  relocation might be called for....

Did not take it outside as it's snowing and the everywhere is covered in crud. If things improve in the week I'll push it outside and take some new pictures.

Just waiting on the fairing back from paint now. My wonderful painter decided to finish my Moto Martin paint that I told him was the lowest priority. Oh well!

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Wheeled the thing out the garage this morning as the temperature was now above zero just to take a couple of pictures for you all. Also discovered another issue! Got a bloody slow puncture. Cant find it either. I am convinced this bike hates me.

Hopefully fairing will be back soon so that can get fitted

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Temperature in to double digits and a dry road so took the Harris for a ride today. Not ridden it for 3 years before today.

First impression - how does anyone contort themselves to fit this thing? I'm 5ft 11 and can barely screw my legs up under me enough to get my feet on the rests let alone adding a further complication of gear changes. Did Harris use jockeys when they designed the riding position? I had to part with my 750 Slabbie as I couldn't bend myself in to it anymore and this is far worse.

Riding impressions - Relatively clean pick up and feels like it wants to rev. Noise through the Harris pipe is superb. Not too loud as to attract unwanted attention but you know I'm coming. Just gave it a couple of miles just to let everything settle in.

Couple of minor oil leaks from generator cover and also from cam cover.

Jobs left to do:

Fix slow puncture in front tyre

Fix minor oil leaks

Purchase dzus fastners to properly fix seat hump and battery box lid

Fit magnets to front hub for speedo and calibrate

Fit fairing (when it finally comes back) plus headlights

MOT

End in sight!

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What clocks are you using that require a magnet on the front hub?

 

I understand what you mean re: the riding position. Harris did not use jockeys when they designed the bikes, they used gibbons. If a human had legs short enough for the high rearsets they wouldn't be able to reach the bars. I'm 6'1" but you get used to it. It's better than a Ducati I had, which was torture to ride at any speed less than 60mph. Using the stock Harris seat helps as it's fairly thick, especially when you consider it's stuck on top of the fibreglass unit. Changing the seats on Magnums for e.g. one from a 916 (yawn) reduces the distance between the pegs and the seat making the riding position worse.

 

ps I think I sold you a rear light unit a while back off of Eblag - I recognise the picture you sent me of your bike at the time. Glad to see it's being put to good use!

Edited by Dezza
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7 hours ago, Dezza said:

What clocks are you using that require a magnet on the front hub?

 

I understand what you mean re: the riding position. Harris did not use jockeys when they designed the bikes, they used gibbons. If a human had legs short enough for the high rearsets they wouldn't be able to reach the bars. I'm 6'1" but you get used to it. It's better than a Ducati I had, which was torture to ride at any speed less than 60mph. Using the stock Harris seat helps as it's fairly thick, especially when you consider it's stuck on top of the fibreglass unit. Changing the seats on Magnums for e.g. one from a 916 (yawn) reduces the distance between the pegs and the seat making the riding position worse.

 

ps I think I sold you a rear light unit a while back off of Eblag - I recognise the picture you sent me of your bike at the time. Glad to see it's being put to good use!

There is no mechanical speedo drive on these Astralites so i'm using a Koso clock. Magnets are attached to disc bolts. Did consider GPS speedo but decent ones are really expensive.

I have no intention of moving away from stock Harris seat. I'm sure some stretching exercises will allow me to create the fetal position required to place feet on rests.

The tail light did come from Eblag. NOS i recall but a while ago. Does look very correct doesn't it. Many thanks for parting with it!

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I thought it looked like you were using Koso clocks, which is why I asked. If they are anything like mine and you are using the sensor supplied with the clocks, they don't need a magnet on each disc bolt. Mine works well on the rear disc with stainless bolts, no magnets. You need to get the sensor optimally positioned over the bolts and this differs between hex-head and allen head. It gives details for this in the destruction sheet that comes with the clocks.

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1 hour ago, R1guy said:

You can buy Koso gps attachment - they are to fit ALL Koso gauges. I'll be using one on my slabby with my rx2n gauge. Much less faffing than trying to calibrate the speedo.

 

see link:

http://kosonorthamerica.com/shop/motorcycle-mx/gps-speed-signal-converter-kit/

Good shout. Just bought 2 of these. One for the Magnum and the other for my Lawson replica that's next project and also has a Koso speedo. Digital-speedos.co.uk are UK stockists. £80.

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  • 3 months later...
On 19/06/2017 at 6:16 AM, Dezza said:

It's really good to see a HM that actually looks obviously like a HM:) I need to get my fairing down from the loft.

 

Does it have TZ250 front brake discs? I cannot think of any others that look like that.

FZR600 front discs. Cheap and easy to find

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