mito new engine- refuses to start, backfireing etc....flames

[spitfire123]

hi all,

for the part couple of months ive been rebuiliding my mito engine..

therse are the aprts ive done

Barrol
piston
rings
big end bearing
btoom end with crank
crank baalanced and trued
new main crank bearings


now i put in it to the bike 2 days ago and yesterday i had a friend come over to help me out to get it running etc..

well we put everything on (apart from fairings of corse) and all it does is relentlessly turn over and keepts shooting flames from the exhaust and backfire alot! and slowly spew blue 2st out of the exhaust...

now on assemblyi s used quite abiit of 2st oil to assemble all the parts wet....i fear ive used to much we tried throwing petrol in to the top of the head.....nothing but a huge backfire

now weve checked the spark and that is perfect and very bright (running the iridium plug) and there seems to be gettting fueel to the engine as there is a faint smell on the plug (but mostly 2st oil).

now another thing is when we take the plug out after cranking a while 99% of the time there is blue smoke comming out of the plug hole.


the engine only fires once ina while but there is more exhaust activity than engine activity.


any ideas before i get on with it today? as i realy want this working by tommrow as i have an MOT thurs

thanks all
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You won't be able to eat my dust......As it'll settle before you get there.

[The Artist]

timing plate.

Is it aligned correctly?

[spitfire123]

[MaybeGuy]

just keep going. it'll fire more often as the oil is got rid of.

the stator plate is fixed, you cant adjust it without modifying the holes.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[ms51ves3]

Have you tried putting some petrol straight in the engine through the spark plug hole to see if it fires then?

[TUG]

If you've changed the big end bearings and had the crank out, are you sure the timing marks line up and all that jazz?
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Haz ER-5, innit!

[spitfire123]

[spitfire123]

[spitfire123]

[yuri2085]

Well have you tried what matt suggested?

[spitfire123]

[spitfire123]

update:

took the plug out...put another teaspoon of fuel in and i had 1 big backfire.....


i then removed the plug and there was a faint smoke comming out of the hole which i now no top be 2st oil as it was all over the cdi box....so i cranked it constanly for 3 mins untill the smoke was gone(from the plug hole)....i then put the plug back n and stuck the choke on and turn it over a few more times....nothing what so ever?

now all the oils got to be cleared hasnt it?


what could it be?

there is a strong spark very good comp etc...but no running!

anyone?


chars
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You won't be able to eat my dust......As it'll settle before you get there.

[spitfire123]

last update of today:

right soent about 1.5 hours down the workshop...and i took off the flywheel etc..and tried re-possitioning the magnito to the most central it would go (litral 2mm differance) i then checked the spark (still very stong) i then tried to start it...and it still wont run

there is clearly petrol on the spark plug and a strong smell in the bore but no action

now it has:

fuel
compression
spark

why the hell dosent she want to go!

ive never had ANYTHING like this before!

and to top it off my syatror bendix has Fvucked from the relentless cranking, and will only turn over in very short bursts

any help much apriciated
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You won't be able to eat my dust......As it'll settle before you get there.

[BenR]

Sounds like too much petrol, have you had the carb apart? Keep the choke off & don't touch the throttle see if it starts on it's own accord.
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Current bikes: suzuki RG125UN wolf. Yamaha MT-07

[spitfire123]

[Kickstart]

[spitfire123]

[Kickstart]

Hi

Only requires a tiny bit of difference for the timing to be out. Woodruff keys shearing is an occasional problem allowing the timing to be miles out. A strobe will make it easy to check the timing.

Athat you have fuel and a spark, but then backfires suggests it isn't igniting the fuel until it has disappeared down the exhaust.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[spitfire123]

[tshort2007]

to gain a backfire from the exaust, it seems you have correct mixture, but sparking too late. the fuel should ignite when the piston is up further than the exhaust port. if it backfires, its igniting after this, when the gasses or unburnt mix are flowing out, so i second timing.

Does your bikehave a powervalve? is this operating correctly?

good luck!

[spitfire123]

hi all,

got it sorted...


MY fault enterily.

turns out i put the pickup 25% out of posstion , i was sitting there for ages glaring at it an dit came to me ad the pickup wires dident look like they were routed propely.

anyway..now starts 1st time on the button...and ive set the balancer shaft up...but its still a bit vibratish even with it setup?

could it be im going to hhave to take my flywheel off again and try diferent firing points?


thanks
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You won't be able to eat my dust......As it'll settle before you get there.

[tshort2007]

BIG SLAPS ALL ROUND

Glad you got it sorted. If you have vibration, its an indicatin of something not balanced. if the ballencer shafts are set up properly, then it may well be crank, flwheel, clutch, basically anything that rotates!

I have it on my AR, cant be arsed to sort it, and it gives a good arse massage when flying along at 80

[spitfire123]