TRX250r.org

Author Topic: how to paint cylinder  (Read 11258 times)

Offline evaneyeball

Re: how to paint cylinder
« Reply #15 on: February 21, 2020, 12:39:52 AM »
right as i was typing broken1 replied and it wouldent let me post it but is that frame gusseted
LED built 86 trx 350 CEO
81 ATC250r
Zero finesse and alot of throttle

Offline broken1

Re: how to paint cylinder
« Reply #16 on: February 21, 2020, 12:42:05 AM »
Looks like it has the Pumashine gusset kit.

Offline Michael88R

Re: how to paint cylinder
« Reply #17 on: February 21, 2020, 09:20:26 AM »
Yes.  Pumashine kit. 
88’ R Esr 350 CEO, Esr trx5 pipe
88’ R Esr ported stock cylinder, waiting for rebuild when my son gets a little older

Offline The norm

Re: how to paint cylinder
« Reply #18 on: February 21, 2020, 09:58:01 AM »
I need to order a few gusset kits
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Offline Jerry Hall

Re: how to paint cylinder
« Reply #19 on: February 21, 2020, 02:52:33 PM »
i checked and have an oversized radiator with bigger hoses,moving a lot more coolant than stock wich should cool everything alot better  and this thing will be babied. ..........

The water pump RPM is what moves or determines the amount of coolant moving thru the cooling system.  The efficiency of the radiator is what determines how much heat is removed as the air passes through the radiator core.  The fin density between the tubes and the number of tubes in the first row ( the row the experiences the coolest air entering the radiator) is what determines the radiators efficiency.

It has been my experience that the Chinese core material that is being used by most of the custom radiator manufacturers is not as efficient per square inch as the core material that was used on the original Honda radiators.  If this is true with your "big radiator",  your big radiator may need many more square inches of surface area to give equal cooling to a stock radiator that is in good condition.

Don't baby it too much.  Radiators do not work well when you are going slow and not forcing a lot of air through the radiator.  The 30-30 rule applies to most bikes that do not have cooling fans.  The 30-30 rule is:  the  bikes speed needs to be above 30 MPH for about 30 seconds out of every minute to keep it cool when you are working the engine hard in the lower gears. 

Offline The norm

Re: how to paint cylinder
« Reply #20 on: February 21, 2020, 04:03:51 PM »
Great information. Thanks Jerry
1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering  ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)

Offline evaneyeball

Re: how to paint cylinder
« Reply #21 on: February 24, 2020, 10:13:46 PM »
how much of a temperature difference is there between the powder coating and the rattle can in the cylinder when running
« Last Edit: February 25, 2020, 05:35:22 PM by evaneyeball »
LED built 86 trx 350 CEO
81 ATC250r
Zero finesse and alot of throttle

Offline All250R

Re: how to paint cylinder
« Reply #22 on: February 25, 2020, 06:04:23 PM »
i checked and have an oversized radiator with bigger hoses,moving a lot more coolant than stock wich should cool everything alot better. and this thing will be babied it will be a sand princess. i mainly do jumps and sand trails. actually im pretty sure arlan told me to powder coat the cases. so i think im just going to powdercoat. plus its pretty easy for me to powder coat the cylinder because i do it all in my shop.
One of the hardest things growing up is knowing when you're getting good advice. I ruined my first set of cases after powder coating. Not too many hours later, two of my transmission bearings were loose in the bore. it's anecdotal, but I have no other known reason that's as likely to account for the widening bore holes. The cases are now my mock set for scribing port timing... Jerry Hall consumes and creates scientific data and has a deep physics background. You should take his advice. It's just not worth the risk. Rustoleum satin black is a really close match to OE black. Duplicolor Storm Gray for 86-7.

The size of your hoses probably don't matter so is not a reason to thik you can afford added heat retention. The tightest restriction in the coolant system is going to be the rate of flow, at best. You can attach your water pump to a drinking straw, then into a sewer pipe back to your water pump, It's only going to flow as much as the drinking straw allows, not the sewer pipe. I grew up in Glamis. Sand is one of the highest drag, engine heating surfaces you can ride on.

If you're a hands on guy and have a bead blaster, do the cylinder and head with glass beads. It will shine up the aluminum without reducing emissivity too badly. Take good advice. People don't like to keep seing it wasted. They stop giving it for free or reserve it for a different population.
« Last Edit: February 25, 2020, 06:09:09 PM by All250R »

Offline tosaw

Re: how to paint cylinder
« Reply #23 on: February 25, 2020, 08:32:27 PM »
Great advice on this forum... and don't worry about matuus, he's not even a real person lol

Offline evaneyeball

Re: how to paint cylinder
« Reply #24 on: February 28, 2020, 06:45:17 PM »
just talked to led and he said that he recommends powder coating engine cases.
LED built 86 trx 350 CEO
81 ATC250r
Zero finesse and alot of throttle

Offline havinnoj

Re: how to paint cylinder
« Reply #25 on: March 02, 2020, 08:38:28 PM »
Where's @Pumashine's thread on that puma he painted metallic silver?

 

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