Question about 1987 Honda Vf 1000 F

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I have a 2008 crf250r i just put kibble white valves in a hot cam rev cam, fmf exhaust, r&d power bowl,boyesen power now, just being re-shimmed the bike has very good compression but was very hard to start once put back together. it pop started and started while it was still very hot but once it cooled down a little bit it would not start again, take in mind all this work was just completed maybe a jetting issue ???

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When you changed the cam, did you reinstall the decompressor onto the new cam?

Posted on Jun 23, 2009


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Hi Ace 2L diesel van. What is the valve clearance warm and cold?

Cold: Intake 0.30mm, Exhaust 0.50mm.
Hot: Intake 0.20mm, Exhaust 0.040mm.

The 2L Toyota engine runs an overhead cam with bucket lifters, and requires removing and replacing of shims to adjust clearances...

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How to adjust roller rockers on my 86 vw golf?

VW has never used roller rockers per say. The engine in question uses pucks (shims) of different sizes available through the dealer or VW specialist shop. This is measure while the engine is hot (metal expansion) with a feeler gauge between the cam lobe at top dead center of each valve and the shim. I believe the gap is .040 for the intake and .033 for the exhaust. Tools needed are valve compression tool for VW's, shim pliers to pull the shims out while valve are compressed (I said valves because both intake and exhaust are depressed the same time using the tool), feeler gauge, a 17mm or 19mm closed end wrench to turn the cam sprocket. Removing plugs helps alleviate compression from the pistons and easily turns.

Jan 17, 2014 | 1986 Volkswagen Golf

1 Answer

2008 Honda CRF 250 R after the bike is warmed up it will not start

Hi, Holdennguyen your bike starts great when cold but once it reaches operating temperature and the engine is shut off for a few minutes then you try to restart it and it will turn over but will not fire or it doesn't do anything, the usual suspects are:
1. When electronics get hot they build up resistance then stop working. It might be an ignition coil, stator, CDI unit etc. First, you must find out if the spark dies out. When the bike won't start, pull a plug wire off, stick a new spark plug in the end and ground the threads on bare metal while someone cranks the engine over. You should see a nice big blue spark between the spark plug gap. Incorrect spark plug gap will cause or contribute to a no start when hot issue.
2. Fuel Tuners have been known to cause this type of problem, disconnect it and see if resolves the issue.
3. Any engine management sensor could be faulty especially the ones that monitor temperature.
4. Gas cap not venting properly, improperly routed fuel lines they must always go down from the gas tank to the carburetor never in any kind of a loop this will cause a vapor lock. Clogged, bent, kinked, pinched or restricted carburetor vent lines will do the same.
5. Overhead camshaft valves adjusted too tight when cold, this will cause loss of compression when hot, except for pushrod engines they usually get looser when hot.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
HONDA CRF250R 2006 Owner Manual
Honda 2004 CRF250R Service Manual
honda CRF250R Hard to Start

Btw, I’m available to help over the phone in case u need at

Nov 02, 2010 | 2008 Honda CRF 250 R

3 Answers

It will not start and it backfire after valve adjustment. did i put the cams back the wrong way?

did u hav piston @tdc power stroke-valves shud slightly clic with ur hand after ajust-mite hav performed it at exhaust stroke! let me know

Jan 26, 2010 | 2002 Yamaha YZ 426 F

2 Answers

How to adjust the valves on crf250r 2008 model

Sorry, specialized task for the experts, as you need shims to perform this task.

Jan 09, 2010 | 2005 Honda CRF 250 R

1 Answer

How do i adjust the valves on a 05 klx 125

I'm not 100% sure on this particular bike, but most late model hi-perf japanese bikes have shim adjustment. You can tell if you take the tappet cover off & the cams run straight ontop of the valves, If it's shims, you need to turn the motor until the cam lobes (pointy parts) face as opposite to the valves as possible (usually upwards) so the valve is completely shut, then use feeler gauges to me asure the gap between the valve tip & the cam. The valve springs can be compressed slightly (carefully) to let the shim on top (or underneath) the bucket be removed & replaced with the right thickness to give factory specs. Sometimes one shim from one valve can be used to make another valve correct, leaving less shims to buy. If not shims, should have a simple screw & locknut adjuster, same setup, just measure between valve & rocker, adjust to factory specs (or slightly smaller for more go)

Dec 24, 2009 | 2005 kawasaki KLX 125

1 Answer

Torque specs for cam on 2006 honda crf250r

Rock the caps around to make sure the bearing locating clips are lined up. Torque the bearing caps to 12 foot-pounds. At this point you must check the valve clearances again. If any are off, the cam must be removed and the correct shims installed.

Please rate this solution. Thanks!

Apr 07, 2009 | 2005 Honda CRF 250 R

1 Answer

The best pipe/muffler 07' ec200

I am not sure as to where you wwant more power. I hear the JD needle makes the bike smoother. If you need more bottom end power a switch for 13:52 gearing will help LTR power valve cover a POWER NOW PLUS POWER NOW (carb divider plates), FMF Gnarly for bottom end, and a 2K2 igntion. As for your jetting it sounds like you could go down on the pilot one size and raise the clip up one position.,,,

Nov 10, 2008 | 2008 Gas Gas EC 200 Hobby

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