Tim's ATC500R Decompression Mechanism - FINAL UPDATE!!

**Louis Mielke** · 02-21-2008, 09:20 AM

Yeah but we got more powa!!!!! YOWZAAA!

**hondahaulic** · 02-22-2008, 12:11 AM

If your still trying to decide on a lever to use you could use the same kind of clutch lever that 400ex's come with and a few other atv's. The lever is designed to operate the clutch and if you push a small pin down it operates the parking brake cable at the same time. Then, just hook the compression release cable up where the parking brake cable goes.

**Louis Mielke** · 02-22-2008, 12:47 AM

That's how mine is. Used an old 250r one though. I already suggested the idea to Tim, I think he wants to do it differently though. :P

**3leggeddog** · 03-01-2008, 08:43 AM

o man,so the 5 hundy is gettin some good improvements it looks like.sweet deal.how about some current pics of the old girl?

**3leggeddog** · 03-01-2008, 08:44 AM

o,and that knuckle you used is from a 97 cr250 kicker

**atctim** · 03-05-2008, 04:44 PM

B - thanks for the info on the knuckle - I will edit my 1st post.

As soon as I finish her up (within a week) I will have a grand unveiling. I actually don't have any good pics of her - but you saw the "color" scheme at the indoor race. I may be the first to go all that color as far as I know.

**Louis Mielke** · 03-05-2008, 04:45 PM

Did you get the reeds Tim? Hows it starting now?

**atctim** · 03-05-2008, 04:51 PM

Originally Posted by Louis Mielke

Did you get the reeds Tim? Hows it starting now?

Well - like most of us know - with many problems solved - another is created. I did install my new reeds -still can;t get her to fire up. I am getting good consistent spark that is blue - however it is weak. I have ordered a new Coil and it should be here any day.

Upon troubleshooting - my coil resistance was way weak (OEM calls for 14 - 23K Ohms resistance) I was getting 9.4.

I do believe this contributed to the hard cold starts. once warm - the weak spark was ok - and once running - you could never tell it was weak. But those cold starts are a problem. Pull start it with another machine and it is OK too!

Will update soon! I can't wait!

Once I get her to start good - I only have left to put a stock swinger on her - then she will be done and race ready.

**BigGreenMachine** · 03-05-2008, 06:35 PM

Hehe, stock swinger! Fun!

Thanks for the update Tim.

**85 250sx** · 03-05-2008, 07:15 PM

like hondaholic said about the levers that do more than one function. you could use a 250sx hand brake for the rear tires they have the two hook ups one for the brakes and another for the mechanism that lets you put it in reveres.

**200x Basket** · 03-05-2008, 08:29 PM

tim

Do you know the cr500 starting ritual? there is definitely a trick to it and that short kicker is not helping you any.

tip the bike onto the left side until gas comes out the vent. now with the kill swith off and the throttle wide open, kick it over slowly about 3 times. now slowly kick the kicker over until the piston is at the top. it willbe hard and then get easy. now let the kicker all the way to the top and kick the snot out of it.

you really need to be able to get a FULL stroke when you kick. if the brake is in the way pull it off and give it a shot.

you may also up the pilot jet a size or two, you should be between a 52 and 55.

**Louis Mielke** · 03-05-2008, 08:40 PM

Trust me, with the decompress the "starting drill" is not necessary at all.

**200x Basket** · 03-05-2008, 09:51 PM

Originally Posted by Louis Mielke

Trust me, with the decompress the "starting drill" is not unnecessary at all.

so what are you trying to say?

that he does or does not need the starting drill?

it seems to me like the lower compression may make it HARDER to start when cold.

**Louis Mielke** · 03-05-2008, 09:55 PM

Typo, I fixed it.

On a normal temp day my 500 will start in 1 kick with the decompress. On a COLD day in winter it takes a few more but its still starts easily. I don't rock the bike, tip it over or set the piston at the "sweetspot" I get on, hold the decompress and kick it like my 250.

55 pilot, 172 main. i actually think it could stand a 52pilot and a 175 main but I haven't had a chance to do anything more lately because of work.

**200x Basket** · 03-05-2008, 10:02 PM

gotcha

I am running a 52 pilot and a 165 main. I think the OEM 250r airbox is holding me bag. I plan to pull the lid and so some plug chops this weekend.

Normally i do not have to tip it, but i do kick it over 3 times with the kill swith off and then kick the snot out of it.

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