What temp does your big bore run at?

[rablack21]

Shrouds? Are they sealed to the side of the radiator so all the air gets pushed through the radiator.

Doubtful. There were only a rare few styles that actually designed theirs in that way. They should be though.

[Skeans1]

Doubtful. There were only a rare few styles that actually designed theirs in that way. They should be though.

We still need to figure out who made that set I have.

[F-Red]

Another good question what pipe are you running I don't see that listed.

^^ Probably the best question. Pipe?

Mine runs 200* on the hot humid days. Chinese made radiator.

[Langbolt]

ACEMAN: Try lowering the clip 1 position (Raising the needle) if it lowers the temps and doesn't bog....you're good!

I have a Pro-X350PV that overheats...tried everything....couldn't get the temps down.....tore into the motor and found the coolant passages around the exhaust area are too resticted with casting flash.....I need to grind them open to get more flow.

I did this to my ESR330R that was running 200-210 with a 185main....now I can run a 178main and the temps don't go over 185!!!

If you're still running hot....pull your cylinder head and check the coolant passages....you might have the same issue as me.

[Aceman]

Another good question what pipe are you running I don't see that listed.

It has an FMF Fatty with a CT Racing Silencer.

Shrouds? Are they sealed to the side of the radiator so all the air gets pushed through the radiator.

The quad is in the toyhauler right now so I can't look, but I believe there was about a 1/4" between the scoops and radiator.

ACEMAN: Try lowering the clip 1 position (Raising the needle) if it lowers the temps and doesn't bog....you're good!

I have a Pro-X350PV that overheats...tried everything....couldn't get the temps down.....tore into the motor and found the coolant passages around the exhaust area are too resticted with casting flash.....I need to grind them open to get more flow.

I did this to my ESR330R that was running 200-210 with a 185main....now I can run a 178main and the temps don't go over 185!!!

If you're still running hot....pull your cylinder head and check the coolant passages....you might have the same issue as me.

More good ideas to check, thank you all!

[sameltoe]

In the woods mines 160ish, when I take it to the dunes I really have to watch it as I've boiled it out several times.

[Grande huevos]

My 330 with Afco never broke 175-180* at the dunes on a 172-175 main

Same bike with a 363 runs about same temp with main jet set at 190-200


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[dem3500]

150 is if im hauling ass all the time. i can get up in the low 200's if im stuck going slow for an extended amount of time

[Aceman]

I just picked up another R with a CT350PV engine and a PWR radiator.  I took it down to Winchester Bay the last few days and it ran well.  Temps were in the 50-65ish range.  When riding the tight twisty trails in 2nd gear I noticed my ESR temp gauge would hit 240 degrees!  When riding higher speeds in the out in the open it would hover around 180-190 usually.  Is this standard for a 350?

What surprises me is my 310 has an AFCO dual pass radiator and most of the time it hovers around 130-150 degrees but I can hit 180 under hard duning.  Both quads have air scoops and neither are running an adjustable timing plate. 

I'm considering yanking the pwr out and trying to find another AFCO, but it seems a lot of you guys on here aren't running anything more than a stock rad or pwr, so what's the deal with mine running so hot? 

Jetting:

40.5 pwk
55 pilot, 1.5 turns out on air screw
dgh needle, clip middle
195 main

I know it's been a year, but I wanted to follow up.  Took the 350R down to Winchester Bay for the last few days and overheated it.  Again.  Tore the head off to find the inner orange o-ring was missing in several spots as well as the dome o-ring had quit sealing.  Called CT on Thursday at 2 pm and told them to next day air the top end gasket set and another dome, had it delivered to the campground Friday!!!!

Installed all new o-rings and the dome and ran it the rest of the weekend.  Temps were 165-190ish the rest of the weekend.  Problem solved!!

Big thanks to CT for coming through for me and saving my vacation!!!

[rablack21]

Glad to hear you got it figured out. Yep, those orings will get ya every time. If they slip out of the groove the slightest amount when you are installing the head, it will cause combustion pressure to push into the cooling system or cause an external coolant leak. After you got that fixed, the temperatures sounded pretty good. Ride on!