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Discussion Starter #1
Ok here's the deal, I have a raptor 660 that I purchased that wouldn't start. I've put a new battery on it, I'm getting fire to the spark plug I've double checked the timing marks, timing chain is good, had the carbs rebuilt, adjusted the valves and now all the bike does is try to start but blows the carbs off the boots.... I know you're thinking wth, but I eliminated the carb by spraying starting fluid directly into the intake and still NO START!!!! I'm getting fire and gas to the engine so, WHY IS MY BIKE NOT STARTING......

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Sometimes engines wear out, without breaking anything.
Sometimes a crack or bad gasket causes compression loss.
A valve can even be stuck open.
These all can prevent it from running, yet the engine will still turn over.
 

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An engine needs 3 things to run.
Fuel, spark, and compression.
You have fuel, as you put it directly in the cylinder. That should have been enough make it attempt to start, backfire.
You have a spark timed correctly.
Which leaves compression.
Can be a cheap gasket or full rebuild.
 

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Discussion Starter #6
Sometimes engines wear out, without breaking anything.
Sometimes a crack or bad gasket causes compression loss.
A valve can even be stuck open.
These all can prevent it from running, yet the engine will still turn over.
Weird thing is that if i keep trying to crank it it'll build up so much compression that both the carbs will completely blow off the boots

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I may be getting older, but I refuse to grow up!
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I suspect you have a intake valve problem if it blows the carbs off. A valve that doesn't close, is bent, or stuck will allow compression to blow the carbs off. I would check compression again and compare it with your manual. If you have a spark plug air fitting, presurize the cylinder at TDC and listen at the intake for leakage.

WELCOME TO THE FORUM.
 

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Discussion Starter #8
I suspect you have a intake valve problem if it blows the carbs off. A valve that doesn't close, is bent, or stuck will allow compression to blow the carbs off. I would check compression again and compare it with your manual. If you have a spark plug air fitting, presurize the cylinder at TDC and listen at the intake for leakage.

WELCOME TO THE FORUM.
I'm going to try this tommorow I'll keep you guys updated.....

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hi Rod. I see you are pretty new here. Welcome to the group. The gang here has helped me a lot. Keep up to speed on how things are going.
There is a lot of knowledge here and people willing to help.
 

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Raptor 660 no start

I have an 05 Raptor 660 I replaced battery,Starter,Solenoid switch won’t crank..When I put screwdriver near solenoid it act like it wants to crank but won’t start...What is my problem?
 

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Hey Cdubman
Start ur own separate thread that way
Its get attention and doesn't get lost in someone 6

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His post is already almost two weeks old... I suspect he's gone!
 
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