Jump to content

2 stroke not starting, help please


Philc
 Share

Recommended Posts

Evening all,


So, i have some issues with my little bike, i have trawled the internet and tried to sort it but haven't come close.


The issue is my 2 stroke is not starting (suzuki gp100). Here is the list i have gone through;

It has a spark, blue and strong (i think) and the plug is gapped correctly.

Fuel is getting to the carb, and all the jets are clear, carb is working properly.

Compression is fine, have had the head off and the piston and rings are good. No scoring on the cylinder etc.


From what i can see, there doesnt seem to be much suction to draw fuel and air from the carb and into the engine. The timing is done via a nippon denser pid unit, the stator plate is mounted correctly with all the timing marks lined up so i dont think timing is an issue.


My experience with 2 stroke engines is nil so any help is appreciated.

Link to comment
Share on other sites

Have you checked compression with a gauge in spark plug hole the problem the Suzuki suffered with was crankshaft seals letting compression past them if left sitting for long time then it needs engine strip and seals replaced in each crankcase

Link to comment
Share on other sites

Not checked with a gauge as i dont have access to one, just from using my finger to plug it up there is a lot of pressure when cranked, obviously not as good as using the proper tool though.


How much of a dip in compression would stop it starting all together, not even a splutter?

Link to comment
Share on other sites

Yeah.....EAB is probably right about the crankshaft seals......if they're shot you'll not get the mixture transferred to the combustion chamber.....or not draw it in in the first place...... :wink:

Link to comment
Share on other sites

That sounds like its the problem, from my crude detective work and only drawing on the haynes manual and my a-series engine knowledge, i thought that the engine basically wasnt sucking air in.


How much of a nightmare would this be to fix?

Link to comment
Share on other sites

Cool, not stripped the engine at all, as it was turning over i thought it would be ok. Had a quick look earlier and a lot of the bolts are completely seized, so slightly hesitant with it.

Link to comment
Share on other sites

Sorry...yes, ATF (automatic transmission fluid)......mixed with some acetone seems to be a highly effective penetrating fluid.......gear oil can be used instead of the ATF......just needs to be some fairly thin oil, mixed vigorously with the acetone....... :wink:

Link to comment
Share on other sites

Sweet, thatll be a nice job for next weekend on my day off between exercises in brecon, and a wife who is due to pop on the following wednesday... An excuse to live in the garage for a bit at least haha.


Thanks for the help, hopefully i can sort it out.

Link to comment
Share on other sites

Sweet, thatll be a nice job for next weekend on my day off between exercises in brecon, and a wife who is due to pop on the following wednesday... An excuse to live in the garage for a bit at least haha.


Thanks for the help, hopefully i can sort it out.

 


Use neat acetone & not nail varnish remover, that only has a percentage in, you can normally pick bottles up from chemists for a couple of quid

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Welcome to The Motorbike Forum.

    Sign in or register an account to join in.

×
×
  • Create New...

Important Information

Terms of Use Privacy Policy Guidelines We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.

Please Sign In or Sign Up