Ludix compression

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

Hi

Anyone know what good compression levels are on a Peugeot ludix blaster?

Thanks
Paul

Jewlio Rides Again LLB · World Chat Champion Joined: 06 Oct 2015 Karma :

Mr Haynes
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Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

You are welcome to enlighten me with the information with in one but I can only seem to find Haynes for 50cc mopeds. I was hoping for something more specific.

Thanks
Paul

andys675 · World Chat Champion Joined: 08 Feb 2007 Karma :

have you measured it? post results here for feedback

none is obviously no good

100 plus is
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Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

Thank you to those giving a sensible answer.

The compression test has come out at 34 which is very low. I performed the test as I would on a 4 stroke assuming the tests are done the same way.

Next job take the engine out and take the head off Smile

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

OK so all apart. Piston has a piece missing with a broken ring and a groove in the cylinder wall. Sad

Old Git Racing · World Chat Champion Joined: 08 Aug 2009 Karma :

You can get loads of aftermarket good quality piston/barrel kits. Just fitted a Malossi kit to a mates sons aerox, looked better made than the original, cost about £100 for everything. Not worth getting the original repaired.
Question is why did it seize?

OGR
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Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

I'd upload a picture for people's opinion but I'm not sure how?

Looks like something got in there due to the damage. Possible that it seized, broke a piece of the piston and fired that around until it rolled to a stop. I need to check to try and find pieces in there somewhere to try and prevent further damage.

I was contemplating put the 70cc bore and piston in but think setting it up may become a ball ache. Maybe just best to stick with standard sizes. Smile

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

Ordered
New head
New bolts
New thermostat
70 cc piston and cylinder kit
Small end bearing

Smile

evoboy · World Chat Champion Joined: 20 Aug 2009 Karma :

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

Well..... that sounds disappointing lol.
Thought it'd be interesting. I bought it all from racing planet but will report back on quality. I have a technigas exhaust and will rejet the carb. Hopefully I'll see a bit more pull on hills Smile

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

Just out of curiosity. Why is a rebored cylinder kit worse ?

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

Fitted the nakaru 70 kit. Which needed 3 Base gaskets. Took about an hour all in and back together. I upjeted from a 56 to 60 which is 7%and it pulls really well up to 50 but I've not gone any higher ad it needs to run in. It has a couple of minor flat spots which maybe a mixture thing as I've not adjusted the mixture but very happy so far. Definite improvement and pulls nicely. I'll up date once I've tinkered a bit more. It's still on a standard carb (with bigger jet). Technigas exhaust. I may fit a unlimited cdi to see but not decided yet

sickpup · Old Timer Joined: 21 Apr 2004 Karma :

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

It needed 3 Base gaskets. The kit came with one then I contacted racing planet who advised and sent me an additional 2.

evoboy · World Chat Champion Joined: 20 Aug 2009 Karma :

Shouldnt need 3 base gaskets. They normally come with 3 metal gaskets and one paper one. The paper one being the most used on a basic setup.

Wouldnt bother with the CDI. They do nothing. My Minarelli AC scoot runs at 11000rpm through the revs with the standard ignition setup. Pulls wheelies and will nudge 70mph.

The Naraku kit isnt a bad kit nor what I described as an ebay special, but depending on what Technigas pipe your running it may not work so well with that cylinder.

The flat spots will be the gearbox setup.

If your running the stock carb, it may well be a 12mm one ( not clued up on what Peugeot used on that scoot ) and will be ok for 50mph, but anything more will need a 17.5mm carb.
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Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

It's annoying me now.
I've fitted a 70cc kit new plug new coil new fuel tap seems to start here ok but doesn't like starting when my nephew uses it. I'm out of ideas on what to check.

Any ideas

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

New problem

Got it started turned out to be a bad connection.

Rode it up and down to suddenly hear ting...... and cut out. The piston had seized. I free it off but there is no compression so I will open her up to see what's going on inside. What could have caused it to seize?

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

You could be right although I did try send find any parts.

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

Too lean, a 7% main jet increase doesn't seem enough for a 40% capacity increase.
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Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

Hi
I ended up with a 66 jet which from a 56 would have been anice 18% increase. It did go well.

It rev'd on its own at idle until warm not sure why.

Paul smifff · Renault 5 Driver Joined: 16 Aug 2015 Karma :

The spec
Naraku 70cc kit
Technigas exhaust
Polini variator rollers and spring

It has the standard airbox and carb. It uses the 56 jet as standard.

What jet do you guys think it should have?
It seized after only a few miles with a 66 jet.

Thanks

Monkeywrenche... · Nearly there... Joined: 27 Mar 2015 Karma :

I think your way under, 70cc with an open exhaust and standard carb (17.5mm) I'd start at 88 and work from there, general rule of thumb I always used was carb size x 5, never let me down, if its bogging go down jets till its stops bogging.
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