Have you checked the kick start paw and idler gear, GasGas is known for the kick start gears chipping / breaking
When this happens it normally makes the engine growl / vibrate so bad the engine feels like it is coming out of the frame.
Also the S3 2 piece head "O" rings maybe leaking, were these replaced when you had the engine worked on?
Terry
Hi Guys, interesting reading the thread about main bearings. I bought my bike new in May 2014 it's a 300 racing. Since buying it I have had to have the main bearings replaced in April 2015 as the bike was really noisy. I have had continual issue with the oil going milky. I have extended the crankcase breather up high. Upgraded to the 2015 water pump last April and have changed from ATF oil to putoline light gear oil. The bike started intermittently misfiring and black smoke coming out silencer when trying to rev it to clear it which did work. But a few weeks ago the bike started growling again as when I had to have the main bearings done last year. Last year I was lucky and my brother in law did the rebuild for me as he is an engineer and into bikes, but am about to try the job myself. My biggest worry is keeping the gearbox intact. Is this easy enough?
Warning, not all brakemtec master cylinders are the same. It is widely known that the earlier Brakemtec master cylinders were manufacture incorrectly, The small holes in the body were drilled to large and not de burred. this would cut the seal.
I do not know the date codes on the parts to know when the factory fixed this issue.
I do know that the newest master cylinders instead of having a 2 piece clamp have a one piece hinged bracket. I am assuming that the newer model has been manufactured correctly?
Note: The GasGas bleeder banjo at the clutch cover is questionable at best. Mine was so bad i could not bleed the system. I went with a after market jitsie banjo bleeder. Also you will need new washer when upgrading.
Several friends have tried the IRC rear tire to save money, I have been told the traction is OK,
one of the problems with a IRC rear tire is it will occasionally burp and go flat for no reason. Usually this happens when riding in rocks or going down a creek with rocks. You put air back in and all is OK for awhile and then Burp again and flat.
The clutch rattle noise should diminish when the clutch is pulled in.
Be a where that if the engine vibrates badly when running. Feels like it is coming out of the frame vibration. That is normally a kick start paw / idler gear with a damaged or chipped tooth. This is bad and needs your attention. All it takes is a small chip to vibrate.
When you change the trans oil, I would look for metal chips on the magnetic filler / drain plug. This will tell the story?
One word of caution, I would not remove the water pump from the clutch housing, I normally put a tie wrap thru one of the bolt holes to make sure it doesn't come out of the housing.
Also the kick start shaft seal can be damaged on removal / install.
I am surprised that your bike is a 2013 that you haven't become a expert on side cover / clutch pack adjust / kick start repair yet ;-)
Brakem Tec master cylinders had many problems in trials applications. Cut seals, metal shavings in rear master cylinders. One dealer had a rear brake failure during setup. My understanding this was in 2014. I'm sure others have more details?
Maybe they have fixed some manufacturing problems now??
The seal did not fail. There was no leaking of fluid.
Interesting comment about new hydraulics. I have a 1988 Hawk NT650 with 63,000 miles and the hydraulics have never been apart, only flushed.
My friend and I both installed the Jitsie linkage protector on our 2014 GasGas. My linkage did have some slight scrapes before I installed it.
As with any time you remove / loosen your GasGas aluminum skid plate, it will take some choice words and a friend to help you get the Jitsie plate installed.
Other more technical people will help with more info, but my understanding you need to bleed the cartridge fork assemblies. Not just drain and replace the oil?
There has been many tech articles on this on the net. I have also seen a video from Australia.
If you look at photo's of Factory support riders you will see your answer.
From a casual observer I see AJP small and large reservoir master cylinders and even on Factory GasGas rider you will see a older style AJP front caliper.
With the problems I saw in 2014 with Brakemtec I started using the older AJP small reservoir master cylinders ( clutch / front brake )
A prominent trials supplier in UK has raised there prices for you guessed it. The AJP small / large reservoir mineral oil clutch master cylinder.
When you say Pro 2014 GasGas, are you a where of the 3 models built in 2014?
TXT Pro, Racing, Factory ( previous Raga model )
Are you a die hard GasGas buyer? If so the 2014 was the start of GasGas downward financial spiral, My friends 2014 300 racing had torques bit 10 clutch hub ring bolts / my 2014 300 Racing had the 7mm 12 point clutch hub ring bolts.
Both bikes had the fiber clutch plates installed incorrectly and Oh my other friends 2015 Racing 300 fiber plates installed incorrectly OOOPPPPPSy
The installed Brakem Tech master cylinders were manufactured wrong and fail, sometimes as soon as you assemble the bike. The rear master cylinder in my friends bike had metal shavings in it, failed in a few hours. The importer had seen this problem before?
Lots of other sniggly problems also like front caliper getting hot and locking the front wheel, just riding down the trail. I have not had a main bearing issue yet.
Clutch finger bent from new, new style 2mm steel plate clutch can not be changed by adding thicker or thinner steel plate to bring the finger height in spec.
I have had to through a fist full of hundred dollar bills at mine to make it reliable and work correctly.
I recently talked with a large trials dealer and he indicated that no parts were available in the USA from the new GasGas owners? and this brought the price of used GasGas trials bikes down. so this maybe the time to buy?
Side note, yes parts are available from the previous parts importer and from Europe, I have been told that it is somewhat cost prohibitive. Other may have more knowledge of the parts availability
As a long time dirt bike enthusiast, I am not a Happy camper with GasGas quality of build on my 2014 and the 2015 is worse from what I have seen.
Years ago I did see a variable compression cylinder head for a Yamaha YZ250, The dome was preloaded for maximum compression and as the RPMs rose it would moved up into the dome for less compression. I believe it was made in Italy?? I searched for photo's on the net and could not find any.
Typically higher compression is for more low end power and less compression is for higher RPM that a motocross bike might need.
I like the idea of externally changing compression, I have seen problems with taking heads off with "O" sealing.
I am newer to trials and GasGas and do not have experience with older models with Formula brake components. My friends have had trouble with Brakum Teck with metal in the rear master cylinder and cut seals. I have changed to the Jitsie ( Beta style ) rear master cylinder kit for my 2014 GasGas. The Jitsie kit isn't a bolt on deal, you must modify / adjust for alignment. Also I had to take a ball-peen hammer to make clearance for the exhaust. So far I am happy with the performance and hopefully better reliability.
It is my understanding that when GasGas had financial problems they cheapened the 2015 Race model and did not use the S3 2 piece head. To reduce the compression would need to purchase a S3 head and insert?
From what I have seen the Keihin carb is more sensitive to jetting and weather / altitude changes. I have seen my bike run great in the morning and run lean in the afternoon.
Terry
I have just picked up on this and I am guessing that you have a 250 gasgas racing like mine.. I had lots of pinking with loads of different combos of carbs (delorto n kiehin), jets and settings The cure...... Head insert to lower the compression a little Now perfect Not touched the carb or settings since I did this last year, I suspect the piston/cylinder was making a little too much compression!
My first race bike was a 1972 Zundapp MC125, The attached photo is from 2007
Wheelies are easy, I am having a hard time figuring out Up / Down turns on a steeper side hill around a tree. Just don't have the technique and confidence yet?
I have Gaerne oil boots with water proof liner, When new, the boots were very tight across my foot ( I have normal width feet) After the boots were broken in they are somewhat wider across my foot. I still can't wear heavy boot socks.
I did see Toni Bou's training video and it appeared Toni was using a very thing sock ( Lycra maybe? ) What are these socks? Are they trials Specific?
PS: It looks like Gaerne normal boots do not have the water proof liner, is this a good option?
2013-2015 Crank Bearings
in Gas Gas
Posted
Have you checked the kick start paw and idler gear, GasGas is known for the kick start gears chipping / breaking
When this happens it normally makes the engine growl / vibrate so bad the engine feels like it is coming out of the frame.
Also the S3 2 piece head "O" rings maybe leaking, were these replaced when you had the engine worked on?
Terry