FXR150 camshaft/head issues

[Damien_Toman]

Yes, Max, having a bloody good time is what it is all about! I'm looking forward to the TRRS too. You should get the 150cc u/g to your bike, with race cams, like Peter and Bruce (from Honda - number 74) talked about. You would be winning bucket races, I expect.

[richban]

Where can I buy an oversized piston/rings?

Here http://www.akunar.com/STD_PISTONS.htm same as a Suzuki Raider half way down the page. They don't make a hi comp piston that fits easy. You can't argue with the price. Andrew A has been running one for a good 6 months and all good so far. I slapped one in for the wellington 2 hour and no problems. Cheapest hp you can get.

[gatch]

Here http://www.akunar.com/STD_PISTONS.htm same as a Suzuki Raider half way down the page. They don't make a hi comp piston that fits easy. You can't argue with the price. Andrew A has been running one for a good 6 months and all good so far. I slapped one in for the wellington 2 hour and no problems. Cheapest hp you can get.

Wow they have lots of stuff on there huh, this could be a useful resource..

[Damien_Toman]

Here http://www.akunar.com/STD_PISTONS.htm same as a Suzuki Raider half way down the page. They don't make a hi comp piston that fits easy. You can't argue with the price. Andrew A has been running one for a good 6 months and all good so far. I slapped one in for the wellington 2 hour and no problems. Cheapest hp you can get.

Hey richban! Much appreciated. Great price. Were they OK on delivery times? You don't happen to have a spare for sale by any chance?

[grantman]

Hi Damien
Looking at your pics of the cams reminded me of the late 80s honda XR250RE heads
The would wear and you would have to fit Teflon half shims to guide the camsaft

Just wonder if this would be a cheap fix ?
Could work as your "test head " because you could port and mod the hell out of it without worrying to much

Just an idea

[gatch]

I was wondering, It was mentioned that one member has seen a few examples like this ? Maybe theres not enough oil getting to the centre bearing ? As in pressure or oil volume etc ?

Just a thought.

[bucketracer]

http://www.flickr.com/photos/dty1/se...414899/detail/

As you can see from the photos, my FXR150 camshaft to head interface has issues - just about to seize. Any ideas or suggestion?

Odd that its on the low load side, as the camfollower buckets would push the cam against the cam cover not the head, but the head is the hotter side.

What is the oil temperature?

Is the problem with the cam/head brg due to the oil getting really hot? would increasing the size of the oil cooler or adding another one help here?

What about ducting some air to it, and/or has removing/changing the front fairing reduced the air flow to the original oil cooler?

[Damien_Toman]

Hi Damien
Looking at your pics of the cams reminded me of the late 80s honda XR250RE heads
The would wear and you would have to fit Teflon half shims to guide the camsaft

Just wonder if this would be a cheap fix ?
Could work as your "test head " because you could port and mod the hell out of it without worrying to much

Just an idea

Hmmm... Sounds very interesting.

[Damien_Toman]

I was wondering, It was mentioned that one member has seen a few examples like this ? Maybe theres not enough oil getting to the centre bearing ? As in pressure or oil volume etc ?

Just a thought.

Exactly. Hence Richban's suggestion to overfill the oil which makes sense to me. The design is an issue - cams should really use good bearings - not metal-to-metal with a dodgy oil interface.

[richban]

Hey richban! Much appreciated. Great price. Were they OK on delivery times? You don't happen to have a spare for sale by any chance?

Yep good service. Count on about 6 days from order to door.

[Damien_Toman]

Sounds great. Thanks for the link.

[TZ350]

........ suggestion to overfill the oil............

So how does over filling the oil help?

So long as the oil pumps inlet remains "flooded" all the time, the pump does not care if there is 1 litre or 200 it will maintain oil pressure.

Over filling only provides more oil to circulate. I would look at adding external oil volume and cooling the oil.

So long as the lubricating oil film is not broken by localized over heating or over loading aluminium makes a good bearing surface. They use it in high load automotive shell brgs.

The only thing is, that its not tolerant of dirt unlike some other softer shell brgs that will bury trapped dirt particles and eventually cover them over.

Copper covered in a very thin coating of lead is another high load brg material used in shell brgs.

Bearing Failure:- http://www.engineparts.com/publications/CL77-3-402.pdf

[Pumba]

Another option for parts is R2 Enterprises, the local TKRJ importer. I do not know if they have oversize pistons however in my comunincations with them they identified a number of oarts that they do supply for the FXR. Unfortuently in the sam breath the reminded me that they are a wholesaler and will only deal with those with accounts, not the general public

[richban]

So how does over filling the oil help?

So long as the oil pumps inlet remains "flooded" all the time, the pump does not care if there is 1 litre or 200 it will maintain oil pressure.

Over filling only provides more oil to circulate. I would look at adding external oil volume and cooling the oil.
.

I am suggesting keeping the oil level at its max for the reasons you just explained. Heat. I would not go crazy over filling it coz the first big rev might just fill your catch bottle. There isn't much oil in these things anyway. It could be a good idea to add a bigger oil cooler to the mix, especially if the compression comes up. It would be interesting to find out if anyone else has seen this problem.

[TZ350]

I think your right Rich, there isn't enough oil and it would be interesting to know if others have had this problem and what sort of oil people are using.

I have heard that TKR parts can be brought directly from Japan over the net.