Philc Posted April 10, 2015 Posted April 10, 2015 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. Quote
eastanglianbiker Posted April 10, 2015 Posted April 10, 2015 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 Quote
Philc Posted April 10, 2015 Author Posted April 10, 2015 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? Quote
Tango Posted April 10, 2015 Posted April 10, 2015 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...... Quote
Philc Posted April 10, 2015 Author Posted April 10, 2015 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? Quote
Tango Posted April 10, 2015 Posted April 10, 2015 It's an engine strip job......but not too daunting on that little engine...... Quote
Philc Posted April 10, 2015 Author Posted April 10, 2015 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. Quote
Tango Posted April 10, 2015 Posted April 10, 2015 Give them all a good soak in atf/acetone mix before even attempting to undo them...... Quote
Philc Posted April 10, 2015 Author Posted April 10, 2015 Atf? Im guessing thats something i can just mix myself with nail varnish remover? Or is it bought in a can?Cheers for the help buddy. Quote
Tango Posted April 10, 2015 Posted April 10, 2015 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....... Quote
Philc Posted April 10, 2015 Author Posted April 10, 2015 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. Quote
GazW Posted April 11, 2015 Posted April 11, 2015 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 Quote
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