Author Topic: ESR 330 Failure (Read 50354 times)

F-Red · « **Reply #30 on:** July 12, 2013, 06:25:06 AM »

Quote from: Langbolt;2850

Have a look in the coolant passage under the Stud boss on the exhaust side.....Does it look like this ?

[ATTACH=CONFIG]322[/ATTACH]

Mine looks worst then your pic.

rsss396 · « **Reply #31 on:** July 12, 2013, 06:42:05 AM »

if it was me I measure the exhaust port height from the deck subtract a .250-.375" and drill or mill down that deep to get the coolant down closerto the exhaust port.
Also make sure there is good flow from the sides of the cylinder under the studs, you want to promote as much coolant flow thru the front area(exhaust port) of the cylinder.
The aprilia 125cc motor in the mid 50hp range had extensive cooling on the front side of the cylinder, the cooling was never a after thought in their design.

F-Red · « **Reply #32 on:** July 12, 2013, 06:49:16 AM »

You can remove that much material, from the top of the exhaust port, through the water jacket?

rsss396 · « **Reply #33 on:** July 12, 2013, 06:59:53 AM »

IMO it would be fine but to play it safe measure a stock cylinders water jacket depth above the exhaust port to the height of the ID of the exhaust port. And use that thickness as your gauge, remember the non power valve cylinders are filled full of aluminum so they can have a blade in there but since you do not have a blade it's just a bunch of filler that slows heat transfer.

rsss396 · « **Reply #34 on:** July 12, 2013, 07:01:22 AM »

Obviously if you left extra material it would allow for higher port timing in the future if you ever decided to build a more drag like cylinder

Langbolt · « **Reply #35 on:** July 12, 2013, 01:27:18 PM »

Quote from: F-Red;3127

Mine looks worst then your pic.

Your pics are in a Private Album.....How can we see them ?

89Longrod · « **Reply #36 on:** July 12, 2013, 02:11:41 PM »

I'm no expert but that Top side and Bottom side look in spec to me!:pirate:

trx250r88 · « **Reply #37 on:** July 12, 2013, 03:59:07 PM »

Quote from: 89Longrod;3233

I'm no expert but that Top side and Bottom side look in spec to me!:pirate:

right on.

Vootie · « **Reply #38 on:** July 13, 2013, 08:32:43 AM »

My ESR 330 did this 3 times also. On the third time the sleeve cracked in a couple spots in the o ring groove and will probably need to be re sleeved to save it. I'm in the same boat as I have a lot of money (porting) in this cylinder and have about 3-4 hours on it. Went back to my stock cylinder for now, but it's not nearly as fun... Saving up for a Sphynx for now.

F-Red · « **Reply #39 on:** July 13, 2013, 09:40:23 AM »

Quote from: Langbolt;3225

Your pics are in a Private Album.....How can we see them ?

Sorry. I moved the pictures within the album, once I posted them. Breaking the link. Operator error. :chargrined:

Langbolt · « **Reply #40 on:** July 13, 2013, 04:05:06 PM »

With ESR being a site sponsor now....maybe they can comment....Does this look like there's too much Aluminum around the exhaust area in that coolant passage....I know from experience that opening up that area created more flow and lower coolant temps on the exhaust side and stopped the premature seizures.

Have they updated their cylinder molds ?

So if we purchase a NEW 330cc non Power Valve Cylinder we won't have this problem again....

spintly · « **Reply #41 on:** July 16, 2013, 04:01:50 PM »

Could you please post some pics of what your dome looks like. Are you using the same dome every time this has happened?

Pumashine · « **Reply #42 on:** July 16, 2013, 10:29:44 PM »

Quote from: Langbolt;3522

With ESR being a site sponsor now....maybe they can comment...

Not to derail this thread but ESR does not have time to be on the forums. They requested a banner only and not a forum section. You must all be aware that 2 guys cannot answer all your questions while building the most economical 250r parts available in the U.S. today. You can bet that if Eddie had the time he would answer each and every question you could possibly have. Thanks for understanding, Tony

86_350r · « **Reply #43 on:** July 17, 2013, 12:04:42 AM »

I too went through multiple problems with my ESR330 non bolt on. It would seize up after maybe 3 or 4 hours or easy riding. I believe I went throu 4 pistons and finally gave up. I couldnt keep the O rings in the head either. I was blowing those out about every other ride. On the last piston I ended up pulling 2 head studs out from all the on-off of the head and gave up. It is still sitting in my shed to this day. Been very happy with my Sphinx so far. Good luck with the cylinder. Hopefully everything works out for you.

F-Red · « **Reply #44 on:** July 17, 2013, 12:40:39 PM »

Quote from: spintly;4148

Could you please post some pics of what your dome looks like. Are you using the same dome every time this has happened?

I posted that picture on the first page. I broke the link, when I moved the picture, in my library. Pic reposted. Same head and insert, every time.