Problem starting my 250r

[Tubsy]

My second post on the forums.

Well having some trouble starting my 250 (81-82?). ive had it started revving it slowy to warm it up with choke on then it would cut out. then id do it with no choke and it wont start.

im giving it a bit of throttle and holding clutch in. but im not in gear. i am going to try tomorrow with choke on and bit of throttle then when it starts choke off.

its had new spark plug. and a fresh top end engine. it might need a new spark plug cap as it comes loose. but thats not the problem as i check its on tight.

i did have it started it earlier and rode it to test it. and it flew! its very fast! so i know it works.

also before i forget. its back fired twice the first time i left it for about half and hour. the second time i put it away till tomorrow as my leg is aching as i havent long recovered from a sprial fracture to my tibia and phibia. so its achy on my leg.


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today is tomorrow and i got it out. and kicked it over and boom it started..... but then cut out. it only seems to start with choke down. and im trying to race to the choke to turn it on before it cuts out but it beats me!

Ive spent 2 hours outside trying and kicking it over. its started a few times and now it wont. when it started there was white greyish smoke coming out of the exhaust. i have put a little extra oil in with the gas as its not been broke in. so the first few rides im going to add a little extra. is this my problem maybe?

Im trying to get the tank off to inspect the spark plug! but the one nut is rounded off! DOH! so i have to find a pair of vice grips. it shouldnt be the spark plug as its a new one. a freind thinks its the spark plug connector. but its on tight.

Ive had a close inspection. and where the reeds are. in the casing is a crack. its not open just cracked and closed. maybe this?

Theres lots of reasons what it could be. but i know its not the fuel as the fuel is running. theres gas in the overflow. i tested the petcock and gas went everywhere so its not blocked.

also id like to say when kicking it over its like gas coming out of a gas gun. but out of the exhaust. really light white smoke. just puff puff puff everytime i kick it over.

the engine cannot be siezed the person said its had a new top end and its on its 2nd bore. with a wiseco .50 piston. new top and bottom gaskets. and like i said i had it running and took it for a spin!

i hope someone can help and give me step by step instructions on finding the problem!

[Tubsy]

also a new honda oem air filter

[Tubsy]

**UPDATE**

Just had it started, raced to the choke. got in on! but still blubbled out. im revving it and its ting - ting - ting - ting - ting - blub - cut out

im trying alot of different scenarios. im holiding clutch in and going up and down with throttle and it starts. with choke off.

im thinking its the carb. but what on it and what shall i do

[renotrikeguy]

Time to clean the carb? My 81 "R" wouldn't start when I first got it. So off came the carby and gave it a good cleaning, and fresh gas.
Once everything was buttoned up she fired right up. Hell it even idled for a while. Your lucky you have a working choke, I have to put a clamp on mine to keep it in the on position.
As for the intake maniflod being cracked, don't worry bout it. Mine is cracked and I just got some good silicone and smeared it all over the outside of it.

[Dammit!]

If it's been sitting a while you definitely need to clean the carb and flush the tank and put new gas in it. Gas evaporates but the oil does not. It might be a mess in there.

[Tubsy]

well the guy said it was in the work shop for a few months. so carb could need a clean or will need a clean!

Also i patched the crack up on the reed vavle or what ever it is called. (the pipe that goes from the cylinder to the carb and the reeds are in it)

And it fired up. idled then cut out. so the installation tape didnt hold up long. so i will try silicone or chewingum and see the results it gives. and with the fresh carb!

What shall i do take the carb out. clean it all with some sort of carb cleaner. clean the jets etc??

[Tubsy]

Also i patched the crack up on the reed vavle or what ever it is called. (the pipe that goes from the cylinder to the carb and the reeds are in it)

Further to that post and looking in a manual its called the 'reed valve intake boot'


can i make a replacement?
or do i have to buy the right one?

[hrc85250r]

sounds like you need to leave the choke ona little longer... when i start my R when its cold out sometimes i can put the choke on a kick it slowly enought to where it wont fire a couple time, that will get some gas in the combustion chamber....then i kick it once really hard and it usually starts right up, sometimes it take 2 kicks....if you kick it too many times without it firing you will foul the plug, so if you were kicking it for 2 hrs, it fouled gauranteed...you might have water(frozen) in you gas line or carb if the plug isnt wet....also its easier if you put your R in a garage with a salamander for an hour or so to heat her up, then start it....

[Tubsy]

Well when i was kicking it i would do it around 20 times. then give up and go do something else. then come back and try and well you should get the picture. i would give up as my leg ached and my hands are blistering even with gloves on.

It is cold out. so maybe something is frozen?
but ill clean the carb and put something over the crack like silicone and bodge it all up and see what happens!

[renotrikeguy]

i agree with Damnit. Clean the carb and clean out your tank.

After the carby and tank are all nice and clean, you might want to warm the porcelan? part of your spark plug with a lighter. This is what I had to do when it was damn cold outside. Leaving your choke on a bit longer shouldn't hurt anything.

And as for the intake boot thingy, They are no longer being produced for the 81-82 250r's. You will have to search the net and hope you can find one. I got lucky and BikeBoneyard.com had one. But im still running the original one with cracks in it. (can you say silicone).

[Tubsy]

Cheers. i have a checklist now

1. clean carb
2. fix intake boot
3. new spark connector
4. check for wires earthing maybe causing a shortage

for the intake boot im going to get some shower/bath sealant. and rub it in the crack and hope this is one problem solved!

[hrc85250r]

i still say bring it in yur garage, warm it up and start it...let it idle for a while to clean itself out and ride the $#!T out of it for a few minutes....then she should be good...lol...

[Tubsy]

Can i put that as number 5 on my checklist? hehe

[Dammit!]

Replace that reed valve boot if at all possible. That's the last thing on earth you want is an intake leak. That will give you a very lean condition and cause you to melt your piston. If it was run like that before you got it, some damage could already have been done. I'd pop the top end off and take a look or at least check the compression.

[hrc85250r]

good point dammit..