overheating and how to deal with it

[Little-J]

Hi,

Where my blaster is right now, its really hot and dry in the summer, and i cant help feeling that when i go out for a ride, im overheating it... it gets to a point where the engine starts to feel tired and dosent rev 100% as easily as it did at the beginning of the ride.. let it cool for 15, back to normal..

my mods are as follows: paul turner pipe, fat boy silencer, vforce 3 reeds, twin air filter, a lot of porting.. ( not sure how good the guy that did it was, has a massive exhaust port that has been raised and widened a lot, and pretty dug out transfer ports) im running the stock carb, with the stock pilot jet, needle from an fmf kit and a main jet a lot bigger than what i found in the fmf kit (330) im runnin a 450 main..

i know im running it rich, but thats in an effort to keep it cool.. oh and 1:28 premix with Motul 800..

 

[yb200]

it prolly runs like crap because your to rich

 

[Blasterdude27]

It sounds like you experiencing "heat fade" a common air cooled problem.. nothing to worry about just let it cool for a min or two.

You should probably move up one size on the pilot jet and drop your main to a 320-340. That should make it alot less boggy, a 450 is HUGE!

as far as the heat fade a set of air scoops may help to direct more air to the engine, helping it cool. Also I know you might have a hard time getting one but look into a pipe that bends to the right and over instead of the stock bend that traps heat around the head. Such as a dyno port, lrd, or power pro's (Power pros is also known as f7, ct, hettrick,trinity )

 

[Little-J]

It sounds like you experiencing "heat fade" a common air cooled problem.. nothing to worry about just let it cool for a min or two.

You should probably move up one size on the pilot jet and drop your main to a 320-340. That should make it alot less boggy, a 450 is HUGE!

as far as the heat fade a set of air scoops may help to direct more air to the engine, helping it cool. Also I know you might have a hard time getting one but look into a pipe that bends to the right and over instead of the stock bend that traps heat around the head. Such as a dyno port, lrd, or power pro's (Power pros is also known as f7, ct, hettrick,trinity )

keep in mind im talking about mikuni jets, they have different numbering than the keihin jets.. 330 was too small.. it would stall at full throttle with anything smaller than a 350. 420 or 430 was ideal if i recall right..

 

[brandoz28]

i'd check for an air leak

 

[blaster240R]

yeah i'm with brandoz, you might have a small air leak leaning it out on the top end and your basically masking it with that huge jet.... do a leakdown test and see if you find a leak.

 

[stephen12091985]

i would suggest getting a bigger carb to.stock carb is a little small

 

[TechBlaster]

As stated above, and I agree, grab a set of these air scoops from Factory7, will not hurt!!! Click this link and scroll down, awesome product.

Scoops

 

[Little-J]

yeah, the air scoops look like a decent idea!

Ill see how my water cooling project goes, because thats not costing me any money, and then if i still have issues, Ill scap my developments and buy someone elses!

 

[2stroke4ever]

have you hit it with a temp gun? how hot are you actually getting?

 

[Little-J]

have you hit it with a temp gun? how hot are you actually getting?

Um, i dont have one.. Im borrowing some thermocouples to glue on to try and map out the temperature distribution on my cylinder, which i can post if anyone wants to look at it..

But, judging by the way a drop of water boils on the end of a cylinder head fin, about 250 F or about 110 to 120 Celsius.

Should i be getting power fade at these temperatures?