K75 hesitates

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george baker
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K75 hesitates

Postby george baker » Fri May 24, 2019 1:10 pm

Hi
I got the K75 out of the garage today after it has been stood a year. It started no trouble, revs without a problem if you open the twist grip slowly. BUT if you "snap" it open, the engine dies

Any ideas?

George
Member 21, R100R, and an unused K75

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Galactic Greyhound
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Re: K75 hesitates

Postby Galactic Greyhound » Fri May 24, 2019 1:53 pm

Hi George,

Dodgy fuel? Sticky injectors? Blocked Fuel Filter? Sticky Fuel Pump? Blocked Air Filter (mouse nest?)

1. Drain off the fuel from the tank to remove any water and stale fuel and use the fuel drained off for the lawn mower/degreasing etc. If you let it stand for a period in a clear container you should see any water lying at the bottom and can remove it.

2. Put in 5 litres of fresh fuel + 10cc of 'Redex Petrol System Cleaner' (Halfords).

3. Let the bike idle for around 15 minutes to warm up the bike and dispense the Redex around the fuel system and injectors and then give it occasional higher revs for a few seconds at a time to see if you can get it running cleanly.

4. Use the 'Redex Petrol System Cleaner' at least once/year at a ratio of 2cc/litre of fuel contained in the tank but fill the tank full for the treatment so that the cleaner is being dispensed into the fuel system for a longer period of use.
Ced.

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george baker
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Re: K75 hesitates

Postby george baker » Fri May 24, 2019 2:46 pm

Hi
good thoughts Ced, It runs fine at idle, and if slowly rev'ed, but the "snap opening" stutter that is the problem, yep water or partly blocked injector could be the problem.

If it passes it's MoT I will try the Redex.

I'm more bothered that it could be a sensor or connector

George
Member 21, R100R, and an unused K75

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windmill john
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Re: K75 hesitates

Postby windmill john » Sat May 25, 2019 12:15 pm

I'm more bothered that it could be a sensor or connector
George
Unlikely they would die, but more likely if they were the reason, then it would be corrosion/furring of connectors.
If you can get to them, disconnect, bit of ACF50 as lube/protector, not excessive, wipe off any surplus, reconnect.


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george baker
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Re: K75 hesitates

Postby george baker » Sat May 25, 2019 4:35 pm

Hi
I may well try that John BUT----

Same fault today-- Low fuel warning light at start up, Full choke for 800 yards, Half choke a mile and it seemed to be OK. Went to the garage, light went off as I go there, but put 10 quids worth of Higrade/ Ultimate fuel in -- THEN it ran fine.

It passed the MoT so I put some Injector cleaner in to celebrate

It seems fine now so I suppose ---- Old fuel. caked up injectors, old plugs etc.

But thanks for all the advice

George
Member 21, R100R, and an unused K75

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Jaythro
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Re: K75 hesitates

Postby Jaythro » Sat May 25, 2019 4:55 pm

If you park it up for a long period again

Fill the tank (prevents opportunity for condensation to happen ) and you can add stuff called sea foam and run it it for 5 mins until its through the fuel system (others are available )

I just add half a cup full of good quality vegetable oil and give it a good swilling and run until you can smell the veggie oil and its protecting the fuel pump and injecting bits from the nasty new fuels :D
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george baker
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Re: K75 hesitates

Postby george baker » Sat May 25, 2019 7:26 pm

Hi
thanks Jaythro, just sort out the speedo and buy some heated grips before using it
George
Member 21, R100R, and an unused K75


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