CHEC showing. No start.

[Hooli]

I think fuel & spark are triggered by the same sensors, the ECU then uses the input to time them. There's other sensors for fuelling too but with no spark you can ignore them for now.

I can only think of the crank sensor that's common to both & required to run. The cam sensor is common too, but the book says it'll run without that & produce a code. It'll be interesting to see what the dealer says as the only other bit I can think of is a failed ignition switch not powering the ECU when the rest is switched on.

[Irish in Oz]

I know why I love my Dodge Kew side valve engines, there isn't one sensor on them. When you pump the pedal with air filter removed you can see the petrol squirt down the Stromberg down draught carb, the plug leads don't even have caps on them so you can stick you finger on there to find if you have spark, now that's technology.

[Alan Moreton]

Hi Hooli.

Yes it will be interesting to see what they come up with.  Thanks for your thoughts. 

Chip.

[Alan Moreton]

Hi Guys.

Quick update for you.  The fault was the engine to frame earth lead!  He was running through a few checks and noticed a spark down the back of the engine when the starter was pressed.  The lead was corroded through to the last few strands of wire.  He replaced it and she fired first time!

He also noticed that some of the vacuum pipes were cracked and when twiddled he could make the engine hunt.  He recommended those were replaced too.

Should be able to pick the bike up on Monday (tomorrow).

Chip.

[seth]

When my engine earth corroded they bike tried to start using the gear postion wires as earth's que much smoke and a bit of replacing much smaller earth's into the loom and replacing the big earth too.
Been fine since and a good few 1000's of miles now.

[Hooli]

Cheap fix then at least & those vacuum pipes do die of old age, mine did a few years ago. Worse than yours though as I touched them & they fell apart...

Explained why it was lumpy as hell at low speed & drank fuel anyway

[grog]

Well done Chip, great result.

[Mick_J]

Glad you got to the bottom of the problem and all will be good now for the summer. 

[Alan Moreton]

Hi Guys.

Thought I would send in another (and final) update now I have my bike back.

To save you reading back - my bike was sluggish to start and eventually wouldn't run at all with the starter turning the motor over, but with a CHEC indication coming up.

I followed GSX army's suggested battery check list and it just failed the recovery side  - so I fitted a new battery.

There were no FI codes /  fault indications coming up, so I chickened out and my bike was collected by my local Suzuki dealers (Orwell Motorcycles Ipswich).  They were maxed out but said they could look at it inbetween other work.  I was grateful for that.

They started a diagnosis a day or two later and noticed a spark at the back of the engine, (almost by accident) whilst turning the engine over.  It turned out to be caused by the Engine to Frame earth lead that had corrode to the extent that only one or two strands were left in place!
That fixed to engine starting issue immediately and they test rode it and phoned me.

They detected a mis fire which since they mentioned it I had noticed before at times, so I asked them to see if that could be sorted.
They suggested the tea bag fuel filter and spark plugs should be the first items looked at and so they changed them.
They phoned me to say she was sorted!

Yesterday I went and collected it.  WOW!!

I hadn't realised how the performance had dropped off over the past few months.  Its smoother throughout the whole RPM range.  No hesitation or misfire.  Starts on the button.  Generally much better all round. 

It cost a bit, but most of that was manhours for diagnosis and the plugs and filter weren't exactly cheap, but its always nice to be able to feel the difference in a vehicle after you have spent so much!  Money well spent.

And now I have my bike back - Its snowing!

Keep safe. Once again thanks to you all for your help and advice.

Regards  Chip.

PS If any of you are running an old 70s  two stroke - what oil do you use?  I have GT380 triple - standard engine and carbs - running on the standard oil injection pump - smokes like a B&*%$£*.  My other two GT380 didn't smoke like this one does.

[T250]

Have you checked the oil pump setting, if I remember there a couple of marks for min and max on the operating arm that can adjusted

[Alan Moreton]

Hi T250,

Yes indeed - spot on setting.  I am wondering if its the oil itself.  Modern 2 stroke oils are supposed to be low smoke, but Im not sure.  I have tried mineral oil (as it would have been back in the day) and synthetic.

I suppose smoke is better than no smoke in a two stroke!! 

Thanks for your thoughts

Chip.

[Hooli]

Aren't modern two smoke oils designed for lower concentrations these days? I seem to recall that from Bantams etc

[Alan Moreton]

Hi Hooli.

Yes I believe that you can reduce the mix in a petroil lubricated bike (like a Bantam from 20 or 25 to 1 to 32 to 1 when you use modern oil.  However, there isn't a way to reduce the flow when using the type of pump the Suzuki uses.  You've got to be a brave man to mess with the lubrication system (or know someone who runs a machine shop and doesn't want paying).

Regards  Chip

[Irish in Oz]

I use this on my 2 strokes and even the racing version, RD400 is pump and the smoke emission levels are good compared to others.
https://www.sclegacy.valvoline.com/en-europe/our-products/engine-oil/synpower-2t

[Alan Moreton]

Hi Irish,

Thanks for the recommendation.  I shall have to give it a try.

Chip