Exhaust hitting radiator hose? - Chicagoland Sportbikes
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post #1 of 25 (permalink) Old 04-15-2014, 12:01 PM Thread Starter
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Exhaust hitting radiator hose?

Im building a YZ144 motor and put it into a 2008 YZ450f Frame and i picked up the blue silicone radiator hose kit and the hose that runs along the two stroke exhaust rubs on the radiator hose that goes to the water pump. Will the exhaust get hot enough to melt that silicone hose?
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post #2 of 25 (permalink) Old 04-15-2014, 12:29 PM
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probably, sooner or later it would let you down
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post #3 of 25 (permalink) Old 04-15-2014, 01:09 PM
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I don't think it will get that hot on a 2t.
you could get some of that mesh hose guard, and that would help keep it off the pipe enough to keep the hose from melting through.
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post #4 of 25 (permalink) Old 04-15-2014, 02:04 PM
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hey Tony use a fricken flash next time you take pics so we can actually see what you are posting.
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post #5 of 25 (permalink) Old 04-15-2014, 02:32 PM
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I would place greater concern on the suspension of the bike with your fat ass jumping it as it is SURE to bottom out repeatedly



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post #6 of 25 (permalink) Old 04-15-2014, 02:55 PM
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If you are concernd add another piece of hose around the section you are worried about with a couple of black Zip-ties.

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post #7 of 25 (permalink) Old 04-15-2014, 03:10 PM Thread Starter
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Quote:
Originally Posted by Bug View Post
I would place greater concern on the suspension of the bike with your fat ass jumping it as it is SURE to bottom out repeatedly



Ha - Fatty
its actually my 2008 yz450f chassis and suspension so it might be too stiff or just right. it was valved for Brad Jerominski by cory lutter who did Reeds shit when he was on yamaha. i put 7 wt oil in it for sumo so im going to put the 2.5 or 5wt back in like when brad had it as it was the best setup ive ever ridden. plush but firm and for my speeds it was perfect. when i put the heavier weight oil in for mx it was a bit stiff unless it was heavy mud city then it felt ok. Ive ridden scotts 2013 ktm revavled and still didnt compare to the ride the SSS forks have when i bought it from brad. Those SSS forks are still the shit and scott j and brad have revavled their KTms 5x already and cant get the ride the old yZ sss forks have. It was almost to the point where scott was going to mount the YZ forks onto the ktm the ktm forks were a bitch. he finally got new aftermarket pistions and is getting the valving almost dialed in but he said the SSS are far better and tunable.

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post #8 of 25 (permalink) Old 04-15-2014, 03:11 PM Thread Starter
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Originally Posted by G2G View Post
hey Tony use a fricken flash next time you take pics so we can actually see what you are posting.
dont you remeber i left the camera at your crib when we made those creampie still shots of you getting filled up.

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post #9 of 25 (permalink) Old 04-15-2014, 03:54 PM
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dont you remeber i left the camera at your crib when we made those creampie still shots of you getting filled up.
Annnnnnnnnnnnnnnd he's back

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post #10 of 25 (permalink) Old 04-15-2014, 04:27 PM
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I wouldn't even let that hose rub on the exhaust. What does that tell you?

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post #11 of 25 (permalink) Old 04-15-2014, 06:23 PM
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Quote:
Originally Posted by tnat View Post
Im building a YZ144 motor and put it into a 2008 YZ450f Frame and i picked up the blue silicone radiator hose kit and the hose that runs along the two stroke exhaust rubs on the radiator hose that goes to the water pump. Will the exhaust get hot enough to melt that silicone hose?
Silicone won't melt, but it's useful max temperature is 300C. Past that and any mechanical properties start dropping fast (abrasion resistance, elasticity, tensile strength).

I'd guess your exhaust pipe is getting upwards of 400C. So yes, you'll be doing damage to the silicone. If your exhaust glows red (in the dark), you're closer to 500 - 600C.
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post #12 of 25 (permalink) Old 04-15-2014, 11:42 PM

 
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post #13 of 25 (permalink) Old 04-16-2014, 09:30 AM
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Quote:
Originally Posted by elroy121 View Post
probably, sooner or later it would let you down
Agreed, that pipe is no Rick Astley, it's going to let you down. Or possibly give you up, run around, or desert you.

Chris
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post #14 of 25 (permalink) Old 04-16-2014, 09:58 AM
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Quote:
Originally Posted by TripleZ View Post

I'd guess your exhaust pipe is getting upwards of 400C.
doubtful.
2t expansion chambers don't run anywhere nearly as hot as a 4t header. if your 2t pipe is glowing red, your jetting/oil ratio is way off and piston failure is immenent.

Tony's 144 will probably run a little hotter, but the pipe on my 300 is pretty much cool enough to touch with your hand shortly after shutting the bike off.
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post #15 of 25 (permalink) Old 04-16-2014, 11:40 AM Thread Starter
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Quote:
Originally Posted by BH View Post
doubtful.
2t expansion chambers don't run anywhere nearly as hot as a 4t header. if your 2t pipe is glowing red, your jetting/oil ratio is way off and piston failure is immenent.

Tony's 144 will probably run a little hotter, but the pipe on my 300 is pretty much cool enough to touch with your hand shortly after shutting the bike off.
I talked to zont he said ill be fine and some other dude on thumpertalk has a yz250 with the same GPI hose and his does the same thing and he rides desert out in cali and it didnt even phase it. ill keep a eye on it and if need be zont said i could heat the pipe up and take a piece of conduit and pound a indentation in the pipe and it wont affect anything. thanks guys.

Shes almost ready! a few more hours of work and done and break in new piston -rings!

BTW how long does 100 octane race fuel from the gas station last, ive got 4 gallons already premixed in my can and i got it around sept. I was thinking of getting 5 gallons new and then do a 50/50 mix of the old and new as i dont want to dump the shit in my back yard in the corner. I should be ok?
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Last edited by tnat; 04-16-2014 at 11:45 AM.
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post #16 of 25 (permalink) Old 04-16-2014, 12:08 PM
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I'd run it in my truck before I would dump it, and we all know you like rubbing your hose on a hot exhaust
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post #17 of 25 (permalink) Old 04-16-2014, 01:14 PM
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Now the important question: how much does it weigh? Im betting it comes in around 212!

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post #18 of 25 (permalink) Old 04-16-2014, 02:13 PM
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Quote:
Originally Posted by Moto804 View Post
Now the important question: how much does it weigh? Im betting it comes in around 212!
have you weighed the new bike?
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post #19 of 25 (permalink) Old 04-16-2014, 02:54 PM Thread Starter
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Now the important question: how much does it weigh? Im betting it comes in around 212!
wet or dry? not yet. Ive got to bring to scotts as he has scales

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post #20 of 25 (permalink) Old 04-30-2014, 09:56 AM
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Thinking of doing this. My concerns are what needed to be modified? the 250 engine requires alot.
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post #21 of 25 (permalink) Old 04-30-2014, 05:46 PM Thread Starter
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have you weighed the new bike?
I did weigh it, with only fork oil 209 lbs, colin was close but thats w3ith full cycra sumo handgoards, anti vibration bars with the filled bar, 450 rear rim and tires, heavy duty tubes and frame guards that are at least 1lb so im guessing shes about 10lbs lighter if i had only stock 125 shit
then again i used a house sacale where you step on it to get it to flash and wait and then step on it so ill have to bring over to scotts as he has real calibrated scales. Its fun as shit though rode byron last saturday and handles great and is light as shit and the 144 feels great night and day difference compared to a 125. i can clear anything at byron that i hit with my 450 no problem. i just have to change the fork oil back to 2.5wt as i put 7.5 in them for sumo to soften the front up.

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post #22 of 25 (permalink) Old 04-30-2014, 06:03 PM
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How the heck did you balance it on a bathroom scale and still get a reading.

I've thought about trying that with mine but didnt want to break the scale or myself getting it on there.


The weather ended up holding out okay sunday so I got a good ride in this weekend too.

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post #23 of 25 (permalink) Old 05-01-2014, 11:56 AM Thread Starter
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How the heck did you balance it on a bathroom scale and still get a reading.

I've thought about trying that with mine but didnt want to break the scale or myself getting it on there.


The weather ended up holding out okay sunday so I got a good ride in this weekend too.
i put my bike lift on it turned it on and slid it under my bike real fast and lifted it.

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post #24 of 25 (permalink) Old 05-01-2014, 12:12 PM
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Quote:
Originally Posted by Moto804 View Post
How the heck did you balance it on a bathroom scale and still get a reading.

I've thought about trying that with mine but didnt want to break the scale or myself getting it on there.


The weather ended up holding out okay sunday so I got a good ride in this weekend too.
weigh one wheel at a time. put a block under other wheel so it's same height as the scale. add the two weights together, and the total should be pretty accurate.
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post #25 of 25 (permalink) Old 05-01-2014, 03:00 PM
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Originally Posted by BH View Post
weigh one wheel at a time. put a block under other wheel so it's same height as the scale. add the two weights together, and the total should be pretty accurate.
Well, yeah, ummmm, sure, there is always that way, derrr

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