Last ditch post for my 98 450ES not running - Honda ATV Forum
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post #1 of 271 (permalink) Old 01-12-2019, 10:01 AM Thread Starter
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Last ditch post for my 98 450ES not running

I have made a few posts trying to get my 98 450ES running and about at my wits end. Here's where I am:
1) getting good blue spark while cranking
2) carb rebuilt and ultra soaked twice, still won't fire
3) fuel coming out the fuel line and carb getting fuel
4) pulled the valve cover and lined up the T on compression stroke, valves very close to .006
5) sprayed a little fuel in the plug hole put plug back in and it popped
6) tried again and put my hand over the carb intake and blew fuel back out onto my hand with some pressure

Some have mentioned a timing issue but if the valves line up with the T mark at .006 the timing should be OK right? If timing was bad the T and valves wouldn't be correct I would think.

Have heard CDI might be bad not sure if that would allow spark but at the wrong time. I am kinda frustrated to say the least...any ideas would be appreciated, I can give more details if necessary.Click the image to open in full size.
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1998 Honda Foreman 450ES
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post #2 of 271 (permalink) Old 01-12-2019, 10:06 AM
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That sounds like a classic CDI failure will pop initially but not run.

Are you using the service manual diagnostics?

Ok if it was me Id pull the CDI and bake it in the oven at no more than 180F for at least two hours. Let it cool completely!!! then reinstall. Dont rush the cool down.

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post #3 of 271 (permalink) Old 01-12-2019, 10:22 AM
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Have you measured compression?
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post #4 of 271 (permalink) Old 01-12-2019, 12:24 PM Thread Starter
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Quote:
Originally Posted by OBD View Post
Have you measured compression?
No wish I could, no tester or if I could borrow one no spark plug adapter..

1998 Honda Foreman 450ES
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post #5 of 271 (permalink) Old 01-12-2019, 12:33 PM Thread Starter
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Quote:
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That sounds like a classic CDI failure will pop initially but not run.

Are you using the service manual diagnostics?

Ok if it was me Id pull the CDI and bake it in the oven at no more than 180F for at least two hours. Let it cool completely!!! then reinstall. Dont rush the cool down.
Only way to get it to pop is putting a squirt into the plug hole. Other than that nothing even if I spray into the carb intake. I'll try to figure out how to remove, prolly have to take the front apart.

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post #6 of 271 (permalink) Old 01-12-2019, 04:42 PM
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Quote:
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Quote:
Originally Posted by Goober View Post
That sounds like a classic CDI failure will pop initially but not run.

Are you using the service manual diagnostics?

Ok if it was me Id pull the CDI and bake it in the oven at no more than 180F for at least two hours. Let it cool completely!!! then reinstall. Dont rush the cool down.
Only way to get it to pop is putting a squirt into the plug hole. Other than that nothing even if I spray into the carb intake. I'll try to figure out how to remove, prolly have to take the front apart.
CDI should be easier to remove; read the manual generally right up front
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post #7 of 271 (permalink) Old 01-12-2019, 05:01 PM
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CDI is housed upfront held in place by a rubber boot, plugs in on the left hand side on top of the main square frame rails. I’d remove the front fender, be a hell of a lot easier.
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post #8 of 271 (permalink) Old 01-12-2019, 05:32 PM Thread Starter
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CDI is housed upfront held in place by a rubber boot, plugs in on the left hand side on top of the main square frame rails. I’d remove the front fender, be a hell of a lot easier.
OK front fender removed to make easy access to the CDI. Oh my very dirty up there. Does it just slide out of the rubber boot or does the boot come apart? If it just slides out I will probably have to remove the connector first, don't want to stretch the wires...
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Last edited by bcsman; 01-12-2019 at 05:37 PM. Reason: add
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post #9 of 271 (permalink) Old 01-12-2019, 05:35 PM
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Just slides out of the boot, it will be stuck though with the years of crud trapped in there. Wet it with a sponge and water, always works for me.
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98 300 Fourtrax 4x4

Custom built mud bike - Now sold.

2004 Foreman 450S

Fully overhauled (nut & bolt rebuild), 2 lift kit, 28 mega mayhems, ITP delta rims, ES floorboards, 22 LED lightbar, Pyle Bluetooth sound system.
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post #10 of 271 (permalink) Old 01-12-2019, 05:56 PM Thread Starter
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Just slides out of the boot, it will be stuck though with the years of crud trapped in there. Wet it with a sponge and water, always works for me.
OK thanks, will give it a go after church tomorrow morning.

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