removing valve keepers, 97cc engine

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kart35

New Member
What's the trick to releasing the valve keepers on this flathead engine? This is the engine off a Baja DoodleBug minibike with 97cc 4 cycle engine.

Thanks, all replies welcome. :-)
 
Do you have a pic of the engine you're referring to? 97cc Lifan, B&S, ? Normally you compress the springs to get the keepers off.

dnut
 
Hello Scotto, I will try to post a pic. Here goes...

http://images.search.yahoo.com/images/view;_ylt=A0PDoX7bnUtPgzgA2buJzbkF;_ylu=X3oDMTBlMTQ4cGxyBHNlYwNzcgRzbGsDaW1n?back=http%3A%2F%2Fimages.search.yahoo.com%2Fsearch%2Fimages%3Fp%3D97cc%26fr%3Dmy-myy%26fr2%3Dpiv-web%26tab%3Dorganic%26ri%3D4&w=260&h=260&imgurl=i.pgcdn.com%2Fpi%2F84%2F67%2F90%2F846790745_260.jpg&rurl=http%3A%2F%2Fshopping.yahoo.com%2F846790745-97cc-pit-bike-engine-for-baja-blitz-dirt-bug-doodle-bug-racer-mini-bike-hensim%2F&size=21.7+KB&name=Blitz+Audio+97cc+Pit+Bike+Engine+For+Baja+Blitz%2C+Dirt+Bug%2C+Doodle+Bug+...&p=97cc&oid=8540ef4a522e322fffe4451bc14d7cd0&fr2=piv-web&fr=my-myy&tt=Blitz%2BAudio%2B97cc%2BPit%2BBike%2BEngine%2BFor%2BBaja%2BBlitz%252C%2BDirt%2BBug%252C%2BDoodle%2BBug%2B...&b=0&ni=60&no=4&tab=organic&ts=&sigr=13jn4i7ei&sigb=12qakqlqb&sigi=1191759sq&.crumb=7Q327ArH21Z

I realize I need to compress the valve spring, just looking for some how to tips. I am used to working on OHV engines, this engine is a flathead.

Thanks, Charles
 
Valve retainers on most flathead/sidevalve engines typically aren't much different from an OHV engine.

I found the attached pic on a parts.pdf for your engine. Sorry it's sideways, only way I could resize it so it's attachable and readable.

Hope this helps!
 

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  • Honda G100.jpg
    Honda G100.jpg
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Years ago I bought a valve spring compressor from Sears made specifically for small engines. It looks like a goofy C clamp with 2 extended fingers on the stationary jaw. Works well.
 
If you are in a place about saving money or money an issue at this time to buy the tool needed? A valve spring depresser can be made from a pair of large vise grips. That is if you have the extra metal around (as it is a minimal amount of steel) and access to a welder. I use Arc Welder myself.

Last I made like this, was to rebuild my cousin's Chevy Vega. As they were wanting over $200.00 to rent one of their valve spring depressors for his 4 cyclinder. Good luck with your project!
.shft.
 
Well that one is a whole lot different that what I have, but I can see how it would operate.
It also looks easy enough to make with some scrap flat stock for free.
 
I have the c-clamp style too, but the end that goes over the spring is too large for 97cc springs (works perfect for ohv 200cc engines).

At approx $20 total w/ shipping, I think I will try to make the tool. :-)

Thanks, for replies.
 
Too be honest, they way I do it normally is just using my fingers. Unless the valve springs are more that 40lb. (which most aren't) my fingers work just fine.

dnut
 
OK, got the engine completely disassembled. Now need torque specs and ring gap specs, so I will start new thread. Thanks :-)
 
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