Chops banana is dead

[GregMember]

KTM Bull wrote:

Quote:

The problem I believe is that the coolant exits from the r/h front of the cylinder head and there is a large exhaust port blocking the coolant path around the l/h side of the head and this causes a hot spot around l/h exhaust valve which causes core shift and moves the inlet boss off centre and causes the valve to scrape on the valve seat and wear itself out faster
this is just my theory
I have some very simple and cheap ways to test this

Interesting and I can go with that, but how come so many do so many miles without this problem and by many I mean thousands, do they have a different head casting for different models?

Moto fathead is having both inlets done, guides, seat and valves. It seems to have been dusted before Chopper got it, the valve was worn we adjusted but it was on the way out and has continued to wear at a rapid rate, exhaust valves and clearnces are fine, which is a normal thing when dust has been involved

TB

[GregMember]

JRD wrote:

Quote:

What about the the big red beast ?
Had any chance to look at it..

Nothing wrong with the BRP, rode it this morning, its all good, movement is normal, didnt seem that way, check this out http://www.obtrailriders.com/index.php?option=com_kunena&Itemid=56&func=view&catid=4&id=16838#16967

TB

[DavidMember]

Trailboss wrote:

Quote:

KTM Bull wrote:

Quote:

The problem I believe is that the coolant exits from the r/h front of the cylinder head and there is a large exhaust port blocking the coolant path around the l/h side of the head and this causes a hot spot around l/h exhaust valve which causes core shift and moves the inlet boss off centre and causes the valve to scrape on the valve seat and wear itself out faster
this is just my theory
I have some very simple and cheap ways to test this

Interesting and I can go with that, but how come so many do so many miles without this problem and by many I mean thousands, do they have a different head casting for different models?

Moto fathead is having both inlets done, guides, seat and valves. It seems to have been dusted before Chopper got it, the valve was worn we adjusted but it was on the way out and has continued to wear at a rapid rate, exhaust valves and clearnces are fine, which is a normal thing when dust has been involved

TB

TB the Throttle use has a lot to do with what Bull is onto and we all use that different:)

[GregMember]

Ktmrat wrote:

Quote:

Trailboss wrote:

Quote:

KTM Bull wrote:

Quote:

The problem I believe is that the coolant exits from the r/h front of the cylinder head and there is a large exhaust port blocking the coolant path around the l/h side of the head and this causes a hot spot around l/h exhaust valve which causes core shift and moves the inlet boss off centre and causes the valve to scrape on the valve seat and wear itself out faster
this is just my theory
I have some very simple and cheap ways to test this

Interesting and I can go with that, but how come so many do so many miles without this problem and by many I mean thousands, do they have a different head casting for different models?

Moto fathead is having both inlets done, guides, seat and valves. It seems to have been dusted before Chopper got it, the valve was worn we adjusted but it was on the way out and has continued to wear at a rapid rate, exhaust valves and clearnces are fine, which is a normal thing when dust has been involved

TB

TB the Throttle use has a lot to do with what Bull is onto and we all use that different:)

Read what you wrote Dave, makes less sense than you normally do and thats saying something!

Please explain

[GregMember]

Come on Dave please explain this throttle, bull thing you are making no sense mate

[DavidMember]

You were asking Bull how come thousands of engines dont have this problem and I was saying that throttle useage of all different types of riders is why some engines give dramas and some dont

[GregMember]

Ktmrat wrote:

Quote:

You were asking Bull how come thousands of engines dont have this problem and I was saying that throttle useage of all different types of riders is why some engines give dramas and some dont

Oh that makes sense now, hey how come the hire companies use DR’s all sorts of people flog the shit out of them, they dont have valve issues, I was asking Bull does Chops have a different coolant casting, because he said

“The problem I believe is that the coolant exits from the r/h front of the cylinder head and there is a large exhaust port blocking the coolant path around the l/h side of the head and this causes a hot spot around l/h exhaust valve which causes core shift and moves the inlet boss off centre and causes the valve to scrape on the valve seat and wear itself out faster
this is just my theory”

Now Scotty and Boulder would ride their DR’s harder that Chopper and theirs hasnt done it? Strange or is it that Chops just got dusted earlier in its life and we are seeing that now?

I am not going into this anymore, just try real hard Dave to think logically about it, if like Bull said above all DR’s would do it, and they dont, but will if they are dusted at some stage. Thats not to say the cooling system couldnt be improved.

TB

[BillMember]

Trailboss wrote:

Quote:

KTM Bull wrote:

Quote:

The problem I believe is that the coolant exits from the r/h front of the cylinder head and there is a large exhaust port blocking the coolant path around the l/h side of the head and this causes a hot spot around l/h exhaust valve which causes core shift and moves the inlet boss off centre and causes the valve to scrape on the valve seat and wear itself out faster
this is just my theory
I have some very simple and cheap ways to test this

Interesting and I can go with that, but how come so many do so many miles without this problem and by many I mean thousands, do they have a different head casting for different models?

Moto fathead is having both inlets done, guides, seat and valves. It seems to have been dusted before Chopper got it, the valve was worn we adjusted but it was on the way out and has continued to wear at a rapid rate, exhaust valves and clearnces are fine, which is a normal thing when dust has been involved

TB

Having some time to think and this would only be the case if all engines/valves did the same in the cr case it is but if this is a one off problem and not common that the valves havent worn evenly it could be a poorly installed valve guide or seat

[GregMember]

Thats right Bull, you are so right, in this case the wear is so fast, also given that the intake flows towards that valve more so than the other (poor design) that is the valve that goes on all DR’s that are dusted they say.

Looking forward to having those rums and an adult conversation with you regarding cooling systems, then after that we can include Dave lol

TB

[DavidMember]

F@ck you and your adult talk I will be drinking lots so I can stand you and ya sh#thouse Honda blah blah…….:kiss: :woohoo: :laugh:

[GregMember]

Ktmrat wrote:

Quote:

F@ck you and your adult talk I will be drinking lots so I can stand you and ya sh#thouse Honda blah blah…….:kiss: :woohoo: :laugh:

Thats the rise I have been loking for LMFAO

love your work bearded one :kiss: 😆 😆

Look forward to the drinks and the rums are on me as usual

TB

[DavidMember]

Trailboss wrote:

Quote:

Ktmrat wrote:

Quote:

F@ck you and your adult talk I will be drinking lots so I can stand you and ya sh#thouse Honda blah blah…….:kiss: :woohoo: :laugh:

Thats the rise I have been loking for LMFAO

love your work bearded one :kiss: 😆 😆

Look forward to the drinks and the rums are on me as usual

TB

Rum

Honda
:angry: :angry: :angry:
Rum

Honda
:angry: :S :angry:
Rum
:laugh:
Honda
:huh:
Hum
:laugh: :laugh: :laugh: :laugh:
Ronda
:laugh: :laugh: :laugh: :laugh: :laugh:
Jum
:laugh: :laugh: :laugh: :laugh: :laugh: :laugh:
Londa
:laugh: :laugh: :laugh: :laugh: :laugh: :laugh: :laugh: :laugh: :laugh: :laugh:
Home Now
:ohmy: :huh: :blink: :dry: :blush: :kiss: :kiss: :kiss: :kiss:

[Mick DMember]

You guys have to much time to think,I do believe.

[DavidMember]

Too much Rum and not enough time is the problem

[Nick AgainMember]

Thankyou for the explanation..i think.. TB, I was of the mind that the DR’s were a very sound machine, which is what piqued my interest in this case. My thought was “Heat” or an Ill fitted guide? Didnt think of dusting as I thought most people understood the need for Clean filters…my bad i guess??Anyway thanks for the sharing of Ideas. Cheers

[Author]

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