problems with the electric start. 08 TRX450R - Honda TRX Forums: Honda TRX 450R Forum
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post #1 of 4 (permalink) Old 07-15-2019, 06:32 PM Thread Starter
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problems with the electric start. 08 TRX450R

I cant get my TRX running using the electric start. The bike will start up when I bump start the engine but it seems to not have enough power. i have fully charged the battery and it still does not work. could the battery be bad or is there another problem that could cause this?
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post #2 of 4 (permalink) Old 07-17-2019, 05:53 AM
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Do a voltage drop test, hook a multimeter to the batt while cranking, should have 10+ V
Check the decompressor by doing a compression test, should be around 60 psi, 08 decomp pins have been recalled by Honda
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2008 TRX 450ER XC racing
FMSQ # 281
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post #3 of 4 (permalink) Old 07-17-2019, 01:20 PM Thread Starter
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so yes Im seeing 9.85V on crank but no start. One question...If it were the decomp pin that is the culprit would it still bump start?

Is it hard to get to?
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post #4 of 4 (permalink) Old 07-18-2019, 06:09 AM
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Yes it will since the bump start in 2nd or 3 rd gear is pretty strong.

If you have a chance measure the volts at the starter, pos lead to engine block, should be slightly lower but not by too much, 9.85V minus volts at starter will measure the wire resistance drop, sometimes they get corroded or damaged. If ok, this leaves a damaged starter (rare) or a cranking compresion issue.
Try finding a compression tester, one with the check valve at the end that screws in the head, others are junk.

On a side note, I haven't heard the bike cranking, but let's say it cranks fast enough, you may run in a stator issue and have too low voltage in your capacitor to spark while cranking. Pull starting spins much faster and magnets will produce more AC volts to your CDI since it's speed related.
You can read resistance on the gray plug, white to blue, blue to black/red and all those to engine block.

Other issue I know of is no 12 V on the CDI pin(don't have the diagram with me ATM), only had this on a ER to R then back to ER for the week end race cut harness lol

2008 TRX 450ER XC racing
FMSQ # 281
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