Engine Wont fire up

Message

Birmo0803 · #1 Post by **Birmo0803** » Tue Aug 07, 2007 10:36 pm

hi all, im rob and im new to the forums. I currently own a rs 125 (yes they are a lot of freakin hassel)

About 2 weeks ago i was going to the cinemas, and my bike major'ly overheated reaching upto tempretures of 105degrees (supposed to be about 65-70)

anyway, my engine cut, i later found out that there was no spark so my bike couldnt work, So i got a new spark plug, stil no spark, so i replaced the coil and htlead/cable with a brand spankin new one. Still no spark.... then i noticed that the earch wire was not attacked to my coil -.- DUUUH

anyway. i then got a spark, so then i connected up all the wires/components. Goes to fire up my engine, and it just turns, (doesnt start :(()

After a few mins, it backfired a few times u know (the pshhhh) but still wont start.

So. recap....

I have a spark. I have clean Fuel. and i have compression... anybody have any clues to why as it wont start...

Its not seized becasue i got told by a friend if it seized the wheel would lockup and mine hasnt :e

thanks for ur time. Rob.
________
full melt hash

Samray · #2 Post by **Samray** » Tue Aug 07, 2007 11:11 pm

I'm sure someone will be along shortly with good advice.
In the meantime , welcome aboard.

D-Rider · #3 Post by **D-Rider** » Tue Aug 07, 2007 11:28 pm

Hi Rob and welcome.

Good to have you join us. The Aprilia strokers are a bit under-represented at the moment so your RS is especially welcome.
Paddy's daughter has an RS - so Paddy may have some good insights into your problems.
My only experience of 2-strokes is my son's Aprilia sonic (which eats plugs like there's no tomorrow) - so I'll leave it to those with more knowledge to point you in the right direction.

BTW have you subscribed to the Aprilia forums on this site - if not, visit the Usergroups section (see top of the page) and add yourself to the Aprilia group.

Cheers

#4 Post by **Kwackerz** » Tue Aug 07, 2007 11:39 pm

He's there.. I added him

Birmo0803 · #5 Post by **Birmo0803** » Wed Aug 08, 2007 12:41 am

:o

gogogo aprilia \o/ - btw, taxis are making me skint not being able use my bike xD
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Lincoln Y-block V8 engine

#6 Post by **Kwackerz** » Wed Aug 08, 2007 9:21 am

I have a spark. I have clean Fuel. and i have compression

However if you have them at the wrong time then they'll not work together.

* Is it a decent 'bright' spark or just 'a spark' ? Have you gapped the plug correctly?

* Check the timing. If it's giving you a spark but the piston is at the wrong point in it's stroke, it'll be as much use as tits on a fish.

I think you'll be looking to the first one. The plug and it's gap.

Check ALL the connetions too. You may've connecte the HT lead poorly and the spark may be weak. You still have the old plug? swap it over, see if that one works

Paulh · #7 Post by **Paulh** » Wed Aug 08, 2007 10:21 am

Birmo0803 wrote: Its not seized becasue i got told by a friend if it seized the wheel would lockup and mine hasnt :e

.

Not correct unless its seized solid (which is less usual)

If it was running too hot the piston could have nipped up in the barrel - it generally just knackers the piston and rings but will not lock up the engine. Only way to check is to whip the barrell off and have a look (you can't tell just by turning the bike over)

If it is the case you will need to find out why it was overheating in the 1st place - check the coolant is full, there are no leaks and the pump is working. Weak mixture / no oil is also a cause of overheating (and siezing) so check the carb / fuel oil / gearbox oil levels as well.

If youve checked electrics / fuel / plug I'd definately have a look at the piston as the next check.

Birmo0803 · #8 Post by **Birmo0803** » Wed Aug 08, 2007 11:26 am

rite thanks for help, ill try all the options, but its kinda hard to get to the barrel on my bike, so i will most prolly have to remove the hole engine. Last time i done this, it wasnt a pritty site =

EDIT

Ok, i just rechecked my spark. And from what i can see if i not completly fucking colour blind is, that the spark is not a perfect blue, (is it supposed to blue enough so its piss easy to identify that its blue, it looks more on the lines of a very white'y blue)

But i dont understand, i got a complete new ht lead/coil and cap :o
________
ipad guide

Pierre · #9 Post by **Pierre** » Wed Aug 08, 2007 7:50 pm

What about taking the plug out and pouring petrol in? If it doesnt overflow in a few seconds then its going through the manky big hole in your piston down into the sump and would explain why its not firing

My mate takes 2 spare pistons for his rs250 wherever he goes :)

#10 Post by **Kwackerz** » Wed Aug 08, 2007 8:02 pm

Birmo0803 wrote:rite thanks for help, ill try all the options, but its kinda hard to get to the barrel on my bike, so i will most prolly have to remove the hole engine. Last time i done this, it wasnt a pritty site =

EDIT

Ok, i just rechecked my spark. And from what i can see if i not completly fucking colour blind is, that the spark is not a perfect blue, (is it supposed to blue enough so its piss easy to identify that its blue, it looks more on the lines of a very white'y blue)

But i dont understand, i got a complete new ht lead/coil and cap :o

Quite possibly you've not got a decent connection somewhere. check the cap and where the lead joins the coil. You can get different 'readings' with different leads, so it could be just that.

It's possible, very likely, like Paul said, that it's goosed inside the engine when it got overly hot. That wont explain the lack of blue spark, but will explain the distinct lack of running when you kick it over.

As Paul also says, check your mix as well. There must be a reason for it overheating beyond the normal.

D-Rider · #11 Post by **D-Rider** » Wed Aug 08, 2007 8:36 pm

mmm sounds a bit like my son's Sonic. Several times we've thought we had a spark (when testing for one) but looking closely the body of the plug was not well grounded and we had a weak spark between the plug body and the cylinder head - not a spark in the plug gap.
Turned out to be a case of plug fouling. A new plug sorted it. (also managed to clean the old one up and get it to run).

Not saying it is this but worth a quick look.

Aladinsaneuk · #12 Post by **Aladinsaneuk** » Wed Aug 08, 2007 8:50 pm

it'll be as much use as tits on a fish.

can i just point out that some of my favourite fishy things actually do have.. shit, never mind I will get my coat

oh - hope you get it sorted soon and welcome

D-Rider · #13 Post by **D-Rider** » Wed Aug 08, 2007 8:55 pm

Aladinsaneuk wrote:
it'll be as much use as tits on a fish.
can i just point out that some of my favourite fishy things actually do have.. shit, never mind I will get my coat

oh - hope you get it sorted soon and welcome

Now I was just thinking it was Kwackerz with the mermaid fetish ..... but you as well Pete

Aladinsaneuk · #14 Post by **Aladinsaneuk** » Wed Aug 08, 2007 8:59 pm

can I just point out how close to the fens we are here - and them there swampy ideas are contagious....

Paulh · #15 Post by **Paulh** » Thu Aug 09, 2007 7:29 am

Pierre wrote:What about taking the plug out and pouring petrol in? If it doesnt overflow in a few seconds then its going through the manky big hole in your piston down into the sump and would explain why its not firing

My mate takes 2 spare pistons for his rs250 wherever he goes :)

Won't work - it will just pour through one of the transfer ports / exhaust port and tell you nothing about the piston.

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