Varadero eBay special engine

[tommivercetti]

My Vara 125 died the compression on the front cylinder was 0.

So I grabbed a used engine of eBay for £200 he said it was running

I tested the compression at 80psi and 100psi looks bad but I thought if I can get some oil moving round maybe it will improve but it will not start!

I have checked the spark, looks good and got some new plugs
Removed the flywheel to confirm the woodruff key has not slipped
I have 2 lots of carbs in which I've cleaned both of them out a d tried
I've tried spraying some starter spray in the intake to help
Best I got out of it was a small judder when I dropped some oil in the plug holes to help seal the pistons

I can't get it to fire. Would you say 80psi on the rear cylinder is too low and the engine has had it?

Many thanks

[Polarbear]

As a general PSI figure they are low. I'm not sure what a Varadero should be but I would expect 100 psi to be the absolute minimum on a bike engine so to answer your question, yes, 80 psi is too low.

However I would expect some sort of combustion, especially with easy start.

edited to add - are you checking it with the throttle full open?
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Triumph Trophy Launch Edition

[Nobby the Bastard]

Did you go to the trouble of finding out why your first engine ended up with no compression on one cylinder or are you just hoping that throwing a piss poor amount of money at it might fix it?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[WD Forte]

I'd have wanted to know why I had no compression at all before
abandoning an engine too.
It may/might be fixable.
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bikers smell of wee

[tommivercetti]

I got the bike as a stolen recovery, the compression has been slowly dropping on the front cylinder since I bought it, using oil and smoking.

I figured the cost of getting the engine stripped down and rebore would be much more than a used engine as doing that work is out of my skill.

[tommivercetti]

[stinkwheel]

Absolute compression figures are not all that relevant. An increase in compression when oil is added to the bore is a bad sign.

Total loss of copmpression on one cylinder especially without some sort of fairly spectacular "event" might just be a tight tappet.

Have you looked at the top-end of either engine? Checked the plugs?

My 350 bullet lost all compression while doing 60. A quick check of the plug revealed it had suffered a catastrophic engine failure because the end of the plug was missing. A look down the hole with a torch told me what sort of failure had occurred (snapped valve).
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Ste]

https://www.ebay.co.uk/itm/Honda-XL125-Varadero-Shadow-125-1999-2006-Engine-and-carb-complete-/233323383127?rig_cvip=true&orig_cvip=true

eBay link before anyone asks.

[tommivercetti]

[tommivercetti]

To update the seller has agreed to give me another engine to try so hopefully can get running and not a loss.

The original engine will be getting an engineer to look at it at some point but I need to speak with him first and find out the costs.

[Nobby the Bastard]

Flame? Really? Straight to the enemy list for you after I've done some random bad karma to you.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Nobby the Bastard]

[Feathers McGraw]

[Riejufixing]

[Nobby the Bastard]

It appears that a 'Nobby has enemied me, call me a waaambulance' mutual support group has been formed.

Me sure you give each other reach-arounds, guys!
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Ste]