CBR250R heart transplant, now won't run

**kiwi-on-wheels** · 3rd January 2016, 23:14

Heya guys, just done a heart transplant my mc17
Took everything from the transplant bike, wiring loom, cdi unit, coils, carbs, everything.

Working in old frame, swap it to my frame, no go.
Tried multiple combinations of spark unit,sensor unit, rectifier,no luck. Turns over doesnt fire.

Stuck my original loom back in, using the original cdi and rectifier etc, turns over, has a couple of attempts at firing at full throttle, then nothing.

Going to stick my original carbs back on and give it another crack,but i'm stumped.

All the coils test out right, both cdi units work, both ignitor sensors work, everything from both bikes test out perfectly but it just wont fire.

Both bikes ran fine (well, my original with the blown hg ran a bit naff) before the swap, which is why im so stumped

Anyone got a suggestion? At the moment i'm tearing my hair out, I just want to go for a ride, all this amazing weather the last 4 weeks (well,apart from the last few days) i'm itching to get out on the bike

Any suggestions would be greatly appreciated

**nzspokes** · 4th January 2016, 07:42

Turn the kill switch to On.

Bahahahahahaha

Manually check for spark. If you have it put a little gas in each plug hole and spin it over. If it fires you know its carbs.

**kiwi-on-wheels** · 4th January 2016, 08:23

:-P

Its funny you should say that, overlooked it once or twice in the diagnosing.

Found it though, felt like a dick, tried again but nope still no luck :-(

It'll ignite engine start happily with the carbs off, but both motors were running happily with the carbs on, I literally frame swapped the motor so I dont know why the same carbs wouldnt still work on the same motor...

Guess i'm stripping carbs again yay

**kiwi-on-wheels** · 7th January 2016, 14:45

stripped, cleaned, rebuilt carbs
it now pours petrol out the overflow, floods cylinder 3 and still wont fire.

put it away for the day before i break something LOL

good thing i have a second set of carbs sitting here, might take a crack at those ones tomorrow, re-set mix screws, clean out the jets and balance, then they should be good to go.

any other suggestions? this bike is doing my head in, i just want to riiiiide....

**nzspokes** · 7th January 2016, 16:24

Originally Posted by kiwi-on-wheels

stripped, cleaned, rebuilt carbs
it now pours petrol out the overflow, floods cylinder 3 and still wont fire.

put it away for the day before i break something LOL

good thing i have a second set of carbs sitting here, might take a crack at those ones tomorrow, re-set mix screws, clean out the jets and balance, then they should be good to go.

any other suggestions? this bike is doing my head in, i just want to riiiiide....

Float valve worn or contaminated.

**tigertim20** · 7th January 2016, 16:32

are you trying to start it while is on its stand . . . ?

**kiwi-on-wheels** · 7th January 2016, 16:38

Will have another look at the float valves cheers.

And yeah, on side stand. Has no center stand.

Worth proping it up so its level? It doesnt have a level cutout, or a side stand cutout... Its too old LOL

**actungbaby** · 15th January 2016, 13:12

Originally Posted by kiwi-on-wheels

Heya guys, just done a heart transplant my mc17
Took everything from the transplant bike, wiring loom, cdi unit, coils, carbs, everything.

Working in old frame, swap it to my frame, no go.
Tried multiple combinations of spark unit,sensor unit, rectifier,no luck. Turns over doesnt fire.

Stuck my original loom back in, using the original cdi and rectifier etc, turns over, has a couple of attempts at firing at full throttle, then nothing.

Going to stick my original carbs back on and give it another crack,but i'm stumped.

All the coils test out right, both cdi units work, both ignitor sensors work, everything from both bikes test out perfectly but it just wont fire.

Both bikes ran fine (well, my original with the blown hg ran a bit naff) before the swap, which is why im so stumped

Anyone got a suggestion? At the moment i'm tearing my hair out, I just want to go for a ride, all this amazing weather the last 4 weeks (well,apart from the last few days) i'm itching to get out on the bike

Any suggestions would be greatly appreciated

I had a old suzuki gs 450 and i sold it new owner said he just sprayed some petrol into the carbs and got it statred i tryed and tryed and gave up

**kiwi-on-wheels** · 15th January 2016, 16:25

Well, I got the second set of carbs cleaned up, cleaned out the jets and bench balanced.

This set dont piss petrol out everywhere either

Try kick it in the guts, it feels like its trying, it kinda splutters but doesnt properly fire.

If I wind the throttle open fully it splutters a bit more, but still, no firing.

Taken the spark plugs out, they are clean, gave them a gentle scuff up with a plastic brush head on the dremel, they came up mint. Left the plugs out for a couple of days, going to be trying to get it going sunday as im working in the city from Monday and really dont want to be taking in the car.

**eldog** · 15th January 2016, 17:10

Originally Posted by kiwi-on-wheels

Well, I got the second set of carbs cleaned up, cleaned out the jets and bench balanced.

This set dont piss petrol out everywhere either

Try kick it in the guts, it feels like its trying, it kinda splutters but doesnt properly fire.

If I wind the throttle open fully it splutters a bit more, but still, no firing.

Taken the spark plugs out, they are clean, gave them a gentle scuff up with a plastic brush head on the dremel, they came up mint. Left the plugs out for a couple of days, going to be trying to get it going sunday as im working in the city from Monday and really dont want to be taking in the car.

Sounds like you need someone (NZSpokes) to have a quick look. Probably something really simple.

**kiwi-on-wheels** · 15th January 2016, 17:17

Id hope so, im spending Sunday tinkering....

**eldog** · 15th January 2016, 17:28

Originally Posted by kiwi-on-wheels

Id hope so, im spending Sunday tinkering....

I am no mechanic, but start from the beginning,

new fuel, get rid of anything in the tank, carbs, floats etc
check oil in sump, no fuel or anything in there.

check spark and plugs are getting something.

put it together, check vacuum - no air leaks - rubber does degrade
fuel coming through clean - I assume there is a choke.
Battery upto scratch, not just 12V and 10.9 when turning over, check voltage at starter.

hope its not something more serious.

remember for engines
fuel, oxygen, heat/spark/energy will start a flame.

for other things usually only require oxygen to start something smouldering........

**nzspokes** · 15th January 2016, 17:42

Originally Posted by kiwi-on-wheels

Well, I got the second set of carbs cleaned up, cleaned out the jets and bench balanced.

This set dont piss petrol out everywhere either

Try kick it in the guts, it feels like its trying, it kinda splutters but doesnt properly fire.

If I wind the throttle open fully it splutters a bit more, but still, no firing.

Taken the spark plugs out, they are clean, gave them a gentle scuff up with a plastic brush head on the dremel, they came up mint. Left the plugs out for a couple of days, going to be trying to get it going sunday as im working in the city from Monday and really dont want to be taking in the car.

Plugs fully clean? No fuel? I would pour a thimble of fuel down each cylinder and try that.