head gasket leak

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head gasket leak

Post  Psyclop on Mon May 07, 2012 12:42 pm

Hey guys,

My head gasket leaks and I want to replace it. I am fairly good with 2stroke engines but I've never dig a 4stroke one deeper than the carb. Please give me some insights. Would I have to time the engine afterwards? Adjust the valve's clearance? Is there something else that I haven't thought of?

Any tips would be greatly appreciated.

Thank you for your time,
George.
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Re: head gasket leak

Post  BuRP on Mon May 07, 2012 3:23 pm

Yes and yes.
The cam's overhead so you need to disconnect the camchain - which is easy because you'll take off the cam's sprocket.After reassembly you need to set the timing (markers on flywheel=cranck & cam) correct, and of course you need to set the valve clearance - which is routine maintenance anyway.

Download yourself the Workshop Manual!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
You MUST have this, pictures & all, it explains all in proper detail.
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Re: head gasket leak

Post  AURORA on Mon May 07, 2012 7:13 pm

It would be the perfect time to upgrade your cam chain an tensioner with HRC parts.
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Re: head gasket leak

Post  BuRP on Mon May 07, 2012 9:11 pm

Those parts are hen's teeth Aurora, can't be gotten hold of as far as I know - or do you?
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Re: head gasket leak

Post  Psyclop on Tue May 08, 2012 1:28 pm

Hey,

Thank you all very much for your answers. HRC parts would be great but more expensive I guess and I thing they change the power chart of the bike (loosing some low end in favor of high etc) am I wrong? For the time being I saw in the manual (got one! Wink that I am going to have to change other gaskets too like the the valves cover ones and so on.. So, price wise, do you suggest buying a top end gasket kit or one by one the ones i need?

Thanks again,
George.
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Re: head gasket leak

Post  AURORA on Tue May 08, 2012 6:51 pm

BuRP wrote:Those parts are hen's teeth Aurora, can't be gotten hold of as far as I know - or do you?

Parts available...kit not available.

You would have to piece one together.

HDLParts.com
CHAIN, CAM (14401-NLB-003 ) $120.98 $90.49

TENSIONER, CAM CHAIN (14511-NLB-000 ) $145.16 $108.58



Does this help

Honda HRC Power Up Kit PN#: 06130-NLB-010

HRC part numbers in this kit...

13011-MBN-305 Rings. Note: confirm proper rings for piston size
14520-NLB-003 Tensioner
13101-NLB-000 Piston
90088-MK4-600 bolt
99101-357-188 Main jet
99101-357-185 Main jet
99101-357-182 Main jet
99101-357-180 Main jet
99101-357-190 Main jet
16012-MBN-641 needle and seat
90041-NLB-000 rubber.........need two
31929-NLB-003 sparkPlug
31920-NLB-003 sparkplug
90602-MBN-670 circlip....need two
14620-NLB-003 Guide
14511-NLB-000 Guide
14560-KCW-851 gasket
12191-MBN-670 gasket
12251-MBN-670 gasket
22401-NLB-000 springs
13111-MBN-670 wristpin
14321-NLB-000 gear
14312-NLB-000 gear
14000-NLB-000 cam
14401-NLB-003chain
11394-NLB-670 side cover
061994-NLB-010 kit
00X32-NLB-000 manual

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Re: head gasket leak

Post  BuRP on Tue May 08, 2012 8:27 pm

Thanks Aurora,

and I'll print these numbers for archiving.
As I've got the camshaft (a genuine HRC) and a h/c Ross piston already I'll only need that chain.

Mind though, no sprockets listed, but I thought this was a type of morse-chain, which would not run on the std sprockets?
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Re: head gasket leak

Post  AURORA on Tue May 08, 2012 8:56 pm

BuRP wrote:Thanks Aurora,

and I'll print these numbers for archiving.
As I've got the camshaft (a genuine HRC) and a h/c Ross piston already I'll only need that chain.

Mind though, no sprockets listed, but I thought this was a type of morse-chain, which would not run on the std sprockets?

Uses different sprockets.

Timing sprocket: 14312-NLB-000
Cam sprocket: 14321-NLB-000

Here is a link for the HRC manual

http://lalala.chu.jp/finedirt/dl/XR650RPowerupKitManual.pdf
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re: camchain

Post  temporary kiwi on Fri Jul 19, 2013 2:40 am

ive built a few of these mtrs, never had the camchain even look slightly worn, even with running hi lift aggressive ramped cams &race valve springs, i replace the camchain at each rebuild[ naturally], save your money , the cam setup with ball bearings dont seem to cause any excessive wear on the chain, the std chain/ sprockets are more than up to it

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