jetting on 05

[jon67]

my 2005 is running lean and overheating. pretty sure its bc of the jetting. its popping on the deceleration. i have a hetrick built motor in it. its got a 200 and 55 for jets. what should i do??? thanks

[d3ktrix]

heh those jets are massive, something sounds wrong.

We need a list of all ur motor mods, running stock carb and all?

[jon67]

14:1 high compression cp piston. stock carb. oversized intake valve. hetrick racing web cam. hetrick ported and polished. vortec ignition

[d3ktrix]

When did it start over heating? As soon as the engine mods were done? Or was it running perfect for a long time and then just started over heating?

Did u change anything when it started doing it?

What else is it doing besides popping on decel, hows the power through out the entire RPM range feel? Does it cut out / bog / sputter at all?

What makes u think its over heating? coolant over flowing? coolant boiling? temp gage? Loss of power?

[jon67]

it was overheating with all those mods done and the valves and head got ruined so i just got that all redone
now i got it back and its shooting antifreeze out the overflow and its popping when i rev it. it seems to have fine power but i didnt ride it much because i didnt want to ruin anything again. it mostly pops on the decel...

[d3ktrix]

Possible that the timing is off.

I'd call the people that worked on it.
Also ur jetting sounds way too rich, ask them y they went with a 200mj and 55pilot.
Was it dyno'd?

[jon67]

wouldnt it be popping if it was running lean tho?
wouldnt seem like its liean tho with a 200 . no it wasnt dynoed.

[d3ktrix]

Unless u have an air leak its deff not lean with a 200.
Too rich of a pilot can also cause popping on decel I've herd. I've never had it happen to me.
Normally it is caused by a lean pilot circuit, but with ur jets I don't think thats possible.

The timing being off can case what u are describing though.

Slap in a 185MJ and a 52pilot to start.
What needle are u running?

[jon67]

where can i get jets that size from?

[d3ktrix]

Any power sports shop/dealer should have them.

Make sure they don't try and rip u off by selling you a dyno jet kit though.

You just need to buy individual keihin Jets.

Did u check ur timming yet?

[jon67]

ok thanks, no i didnt check the timing. i just got this thing and dont know much about it or how to do it. if u could just sum it up i can figure it out.

[jon67]

i just threw i new radiator on it and its running fine except still pops. and i looked back and saw a flame shoot out the exhaust.... rich?

[8my_Cash]

yea most likely a little rich, i had a 300ex that was running rich it would pop with a decel and it would shoot some carbon out as well.


what i would try to look and listen for is if the motor starts to ping/knock on hard accel. those noises would most likely indicate a lean problem. also i would check the spark plug to see what it looks like. if its a nice tan color its stoich which is where you wanna be. a black plug means too rich and a burnt looking light gray plug with possibly some electrode damage to the plug usually indicates lean.

on a last note the popping really would not bother me IMO since my old 300ex did it. but i would really just check to see how the plug looks and how the engine is sounding

im still leaning more towards a little on the rich side with your problem.

[Ty's400]

Try going back to the stock 48 pilot and around a 185 main jet.

[d3ktrix]

Originally posted by jon67
i just threw i new radiator on it and its running fine except still pops. and i looked back and saw a flame shoot out the exhaust.... rich?

If it shot flames on the decel its probably rich, if it shot flames when u were on the gas its probably lean.
Could do it either way tho.

[jon67]

i called hetrick racing and the guy said to try replacing the header gasket. so i did that and it actually seems a little better. still pops. couldnt i just adjust that little air fuel screw on the bottom of the carb to fix that or should i throw in a 195mj ?

[d3ktrix]

Originally posted by jon67
i called hetrick racing and the guy said to try replacing the header gasket. so i did that and it actually seems a little better. still pops. couldnt i just adjust that little air fuel screw on the bottom of the carb to fix that or should i throw in a 195mj ?

If the A/F screw is turned in too far it could make it lean.

Warm the bike up and let it idle while adjusting the A/F screw.
You want to find the spot where it gives you the cleanest idle.

-If less then 1 turn out gives u the best idle the pilot jet is too big.

-If more then 3 turns out gives u the best idle the pilot jet is too small.

-If you can turn the A/F screw all the way in and the bike doesn't stall then your pilot is too big.

-If turning the A/F screw has no affect on ur idle the pilot jet is too big.

Those are the basics for tuning you pilot circuit.

If replacing the the header gasket helped some then you did have an air leak like I thought before and you were sucking in cold air on decel and causing a lean condition.

[jon67]

ok thanks alot. il give that a try tomorow and let you know what happens.

[d3ktrix]

aight, GL =)

[jon67]

i screwed it in all the way and it didnt stall. the pilot screw had no effect on the idle. soo i ordered a 52 pilot. should i change the main too once i put in that new pilot? thanks

[d3ktrix]

Miz well order some other mains while your at it so you have them.

Get a 185MJ to start.

[jon67]

i have mains. i have a 180,185,190,195, 200 thats in there now and a 202 should i throw the 185m in there with the 52 pilot?

[d3ktrix]

Originally posted by jon67
i have mains. i have a 180,185,190,195, 200 thats in there now and a 202 should i throw the 185m in there with the 52 pilot?


Yup, same as I run.

Make sure the top end isn't lean tho when you put the 185 in. It shouldn't be, but if you have another air leak that might be why they had the 200 in there.
Make sure it runs strong through the top end and doesn't cut out.

[trx250r180]

what clip is needle in? should be 4th to 5th clip if stock needle ,3rd if hrc needle

[jon67]

is there any place online that i can get a 52 pilot? my local honda dealership is retarded and gave me a dirtbike pilot which they said would work but didnt. and they claim u can only put a stock 48 in the pilot.

[d3ktrix]

Originally posted by jon67
is there any place online that i can get a 52 pilot? my local honda dealership is retarded and gave me a dirtbike pilot which they said would work but didnt. and they claim u can only put a stock 48 in the pilot.

Ya they are retarded

This site sells jets
http://www.magicracing.com

[jon67]

i cant find the right pilot jet that will fit my carb. the Keihin Pilot Jets says "will not fit stock trx450r carbs.

[reynolds716]

I was having this same problem, my problem was the intake valves where to tight, I adjusted the valves and have the 41mm FCR carb with 185 main and a 50 pilot and it runs great.

[jon67]

i just tried a 52 in there with a 200 main and it still pops on decel. what should i do, throw a 48 in ? help

[reynolds716]

check the intake vaules they maybe tight they should be set at 006 and exaust should be 011. Mine was doing the same thing no matter what jets I put in there.

[jon67]

ok thanks, i want to check them but i need some help. once i take off the head cover can i adjust the valves from there? thanks, for the help

[reynolds716]

Yes all you need to is remove the three bolts from the head cover to check them here is a good write up I found online on adjusting valves http://webpages.shepherd.edu/ghott01/valveadjustment/valveadjustment.html