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Old 10-21-2007, 02:54 PM   #106
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I'm was saw HK Pre-world champion,
use this engine the temp up to 140 ℃
this temp ok ?
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Old 10-25-2007, 01:47 AM   #107
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ok so I took my CRF apart and cut the insulator off the carb to replace it and noticed fuel had been leaking through my front bearing, so I believe I found my air leak. The engine has only done 1L, is there any reason this would have happened so early in it's life? Also, how do i replace it? I've heard you have to heat the block to get them out, but I also assume I have to take the crank out and all. Should I put a CRF one in or are there better quality ones around that i'd be better off using?
The front bearings are meant to leak a little, we prefered having a little too much lubrication than not enough. so some leaking is normal. What is coming out is an excess of lubricant, there is no air going back inside the motor...
As long as there is no play you are fine. The front bearing is not generally an issue, the rear one is the one that wears out sooner.

If you replace the bearings with bearings from another brand, you could experience loss of performance and lack of lubrication of the shaft resulting in increased wear.
It's not only about the size of the bearings, bearings of similar sizes are graded differently depending on their play/dilatation ratio when heated. A ball bearing which is not adapted can spin freely when the engine is cold but seize when the engine is hot.

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Old 10-25-2007, 11:36 AM   #108
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News on the street are, that the factory which has been producing the CRF engines has shut down and that Kyosho / Orion are currently looking for a new manufacturer for their engines.

The name Picco was mentioned a couple of times.

Nano?
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Old 10-25-2007, 12:49 PM   #109
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It is already old news that Toki is closed but Picco could be the new factory because Bertin was driving a Picco at the worlds and trust me that was no engine somewhere bought at a LHS.
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Old 10-25-2007, 12:57 PM   #110
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Kyosho CRF CPD
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New Kyosho CRF-ky-crf88551.jpg  
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Old 10-25-2007, 12:58 PM   #111
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Kyosho CRF CPD
You are showing something that have been in the US market for a while.
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Old 10-25-2007, 05:37 PM   #112
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Originally Posted by Nano View Post
The front bearings are meant to leak a little, we prefered having a little too much lubrication than not enough. so some leaking is normal. What is coming out is an excess of lubricant, there is no air going back inside the motor...
As long as there is no play you are fine. The front bearing is not generally an issue, the rear one is the one that wears out sooner.

If you replace the bearings with bearings from another brand, you could experience loss of performance and lack of lubrication of the shaft resulting in increased wear.
It's not only about the size of the bearings, bearings of similar sizes are graded differently depending on their play/dilatation ratio when heated. A ball bearing which is not adapted can spin freely when the engine is cold but seize when the engine is hot.

Nano
Thanks nano, I've left the bearings as is. I'll see how it goes with the new insulator
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Old 10-29-2007, 05:23 PM   #113
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Ran this engine at OZ nats last weekend, It was fast but may need those upgrade to make it faster, no leak and tune issues
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Old 10-29-2007, 08:04 PM   #114
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I'm still not having any luck. I'm reasonably confident that the engine is leak free now (assuming the front bearing isnt leaking air), so I'm gonna replace the fuel lines and check the tank for leaks, and I'm gonna switch to runner time on the off chance that its the fuel. If none of that works I'm gonna chuck the friggin thing and buy something else
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Old 10-29-2007, 10:57 PM   #115
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Craig

It does have small amount of oil leak from front bearing but nothing serious and try use the pressure bottle between the tank and pipe it help the when idling and in full tank with less pressure.

ask tl2111 for help to tune it, he tune the engine for me at the Nats
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Old 10-31-2007, 04:41 AM   #116
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Craig

It does have small amount of oil leak from front bearing but nothing serious and try use the pressure bottle between the tank and pipe it help the when idling and in full tank with less pressure.

ask tl2111 for help to tune it, he tune the engine for me at the Nats
Thanks overland. I've dropped in a pressure chamber and will see if Tommy can get it singing on Sunday
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Old 11-01-2007, 12:08 AM   #117
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ask tl2111 for help to tune it, he tune the engine for me at the Nats
lol be careful with this Tommy chap Craig, there is a reason why they call him Tommy "too lean" Lee
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Old 11-01-2007, 12:20 AM   #118
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lol be careful with this Tommy chap Craig, there is a reason why they call him Tommy "too lean" Lee
hey Tomas

even tho it maybe lean still way better then your air leak engine which cant finish a race
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Old 11-01-2007, 03:14 AM   #119
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hey Tomas

even tho it maybe lean still way better then your air leak engine which cant finish a race
too true man
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Old 11-27-2007, 09:15 PM   #120
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My buddy runs 1 in his NT1 for our club races and he wasnt totally happy with it until he got it worked by Murnan........it was fast b4... but no faster thn anything else...
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