Pulling my hair out rebuild wont start!!

Hi guys, I have finally rebuilt my engine on my sp50 its running a doppler s7r 70 kit a pollini (dellorto) 19mm race carb and a pm tunning crank and reed block, i have a 90 jet in the carb, standard air box with a mollosi filter in it.

The big problem is it will not start it has a brand new plug in it giving a good spark, there is fuel getting to the engine as the plug iswas damp after i flooded it,the engine pops and cracks like its trying to go but just doesnt quite fire into life!!

Im also running premix at 20mm oil to one litre fuel.


Really struggling with this one now so any help is more than welcomed!

 

try open airfilter as your setup sounds like i dont get enough air with standard airbox

 

Ive tried both ways, with and with out filter but it still wont go i tried messing with the main jet yesterday and it almost fired into life with a 110 jet in it! this seems massive to me but the standard bike did run on a 90 jet for some reason. im gonna wait for my new exhaust to arrive tomorrow and put that on and see where i go from there as the shitty can thats on is not made for a 70 kit so that could be a huge part of my problem but im really confused by the size of the jet that is in as it from what i have been informed that sounds way too big but that and a 105 is the only sizes its even made an effort to start on.

Thanks for the reply ill let ya know how it goes.

 

i had this problem, it is really hard to get your bike working without airfilter, thats why so big jet doing something as its getting somewhere near the point where you mixture should be, as i said try open filter, it worked for my bike.. or just try cover it with your hand and control the air fluency and make someone kick it for you, also i had a problem today which was the oil if i wouldnt start it from first kick there wuold be to much oil mixed in petrol which was making me soo confused, try unconnect the oil pipe, start the bike and the put it on straight away ,
hope this helps

 

Cheers terro ever helpful as usual, I guess been a newbie it can be a pain in the ass to get it right, But if ya dont try u never learn