Author Topic: New to VMX in general, rebuilding an old farm bike PE250  (Read 17688 times)

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Offline suda695

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #15 on: January 24, 2016, 10:57:40 pm »
Haha yeah I caught that after the pic was taken, good spotting lol

Offline frostype400

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #16 on: January 25, 2016, 12:18:39 am »
There is usually a mark on the cases to line the stator plate up to a straight line gouge to line up with a mark on the plate obviously can't get the mag in the wrong spot because of the woodruff key.
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Offline GMC

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #17 on: January 25, 2016, 04:13:22 pm »
Those PE's do make great farm bikes don't they ;D

Also this might be a stupid question but is the muffler neccessary to run the engine in terms of back pressure? As I have that off at the moment.

The muffler isn't necessary for it to run but the chamber (front section) will be.

If you have had the flywheel off it may be an idea to check to see if the key has sheared and let the flywheel move.
You can usually do this without taking the flywheel off by taking the nut/bolt off and looking at the end of the crank
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Offline suda695

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #18 on: January 26, 2016, 11:03:53 am »
The Woodruff key I guess is the raised section that mates with the flywheel? Yeah that's fine. I'll have to throw the front chamber on, that whole section is welded as one and it's a pain in the arse to remember how it went back on. I might chop it in half to make it easier on myself as ill most probably be getting a new part anyway

Offline Glen08

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #19 on: January 26, 2016, 11:42:51 am »
Silly question  ...does she have compression  mate ?

Offline suda695

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #20 on: January 26, 2016, 02:19:03 pm »
Yeah commpression's good too. Honestly there's no silly questions at this point  ;D

Offline frostype400

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #21 on: January 26, 2016, 04:32:58 pm »
I just got home from mucking around with a 82 pe 175 that I got from under a tree the other night I got it fired up no dramas no carb on it the plug lead was dodgy as though maybe worth checking that a bit as well and even a new plug just in case basically got fuel got spark it should fire.

When you have the carb on try with a clean but dry plug and then see if it comes out wet after trying to start it for a while and adjust the mixture screw in all the way and then out 1.5 turns.

You better not be trying to start it with the rag jammed in the carby too haha. :)
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Offline suda695

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #22 on: January 26, 2016, 07:24:43 pm »
Cheers for all your help with this one, probably not the best bike to pop my proverbial vmx cherry with to be honest. At the moment there's nothing doing, still not firing even though it seems that everything's ripe for the fire so I'm at a loss. The rag is out of the carby when I'm kicking it, I've got the mixture screw set at 1.5 turns out and after trying to start for a bit the spark plug (which I know is sparking, at least outside the engine) is wet with petrol.

I'm starting to feel as though the amount of time I've spent kicking this over with out it firing is starting to drown the chamber with petrol...

Offline sleepy

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #23 on: January 26, 2016, 07:48:35 pm »
Sounds like it is flooded or the spark is to weak to fire under pressure. Try with a clean plug reducing the plug gap to .25mm , turn off the fuel tap and kick it with full throttle and no choke. If it does start with a crankcase full of fuel it will run like crap till it clears out.

Offline frostype400

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #24 on: January 26, 2016, 08:52:18 pm »
Maybe you are near another forum member who could give you a hand with it.

What I usually do is forget carb for a start still leave it on but what I did today was put a bit of fuel in a Powerade bottle but you can use anything sometimes I use a Coke lid or some sort of container with a small amount of fuel put that direct into the plug hole don't need much at all put the plug back in usually that will fire on a good swift kick sometimes PE's don't like to start unless you really kick through or sometimes I will kick twice or more quick so motors still turning on the second kick.

I know on my first 400 I got I couldn't start it for a while I just wasn't strong enough to kick it just hard enough then when I was 14 I finally got it going i have had plugs spark outside the cylinder but no action in its worth having a few spare.

Also you have to remember it's easy to get good spark out side cylinder when the plugs out you are turning over nice and quick but plug back in and under comp it's hard to really get that thing turning quick
« Last Edit: January 26, 2016, 08:58:22 pm by frostype400 »
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Offline jerry

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #25 on: January 26, 2016, 09:56:18 pm »
Checked the exhaust or muffler for spiders nest? Happened to me once. Just saying. J

Offline suda695

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #26 on: January 27, 2016, 12:01:04 am »
Bloody hell a spiders nest!? That wouldve ticked them off haha. I havent checked but i guess anything possible at this point. Could be a tiny unicorn in the combustion chamber for all i know.

I have tried putting fuel directly into the chamber through the plug hole, you mentioned that ealier frosty. Unfortunately I had no luck with that either. I'm trying all different combinations of the suggestions given as well so you can imagine my frustration! I thought I'd having going by now or at least coughing and spluttering! By now I have got a pretty good handle on kicking the shit out of it too so I don't think that's an issue.

I think the next step is to buy a new spark plug for it and go from there, starting to think its got something to do with the spark or the mixture. I mean at the end of the day I guess that's all it really could be so I'm not really narrowing it down at all...

I'm usually not one give in and ask for help but I'm almost at the end of my tether with this one. If there in anyone willing to lend a hand and finds themselves in the Ipswich, QLD area for some reason I'd be grateful for some hands-on advice. Just to get the bloody thing running!

Offline jerry

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #27 on: January 27, 2016, 06:32:29 am »
I'm serious. J

Offline rocketfrog

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #28 on: January 27, 2016, 09:15:05 am »
Ah there you are Ben, we spoke about a back wheel for your PE a while back. I have a flywheel puller you may borrow if you need to get the flywheel off your PE. These blokes are seasoned campaigners with the PE models so your in good hands. I figure if you have spark, your on to a good start. As I said, electrical parts can be difficult to source for the PE250/400 for reasons I am sure I dont know, most other bits are still around and a good deal of them from Suzuki. Perhaps Oldfart is on to it, flogging the flywheel with a mallet would probably stuff the magnets. I am tipping that the starter or choke circuit needs a second look if you say the the plug is wet and the plunger is not moving freely. I am happy to lend a hand if you need it, sometimes a good push start is in order if shes loaded up. just make sure all the controls (brakes, shifter and clutch) are working well before you launch it down a big hill.

In the meantime, check the clutch is not sticking if the bike has been sitting for a long time. If you recall I was speaking to you about some of the issues I experienced reviving an old PE250, I mentioned the elec issues but also the the clutch plates were frozen (friction discs and pressure plates stuck together).  I remedied the problem by dimantling the clutch and giving the plates a rub with a sheet of wet and dry (about 240) flat on a sheet of glass. I needed to crack them apart carefully after a little soak in oil first, but it all came good with a little care and patience.
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Offline Rossvickicampbell

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Re: New to VMX in general, rebuilding an old farm bike PE250
« Reply #29 on: January 27, 2016, 02:17:09 pm »
what does a complete new carby cost - $150 - compared to time spent trying to fix????
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