08 hop up's


19 replies to this topic
  • markryam

Posted February 17, 2008 - 08:50 AM

#1

Whats the best hop up you can do for the 08 450f - apart from the obvious exhaust!!!

whats peoples ideas on,
A- cams
B- ignitions
C- high comp pistons
D- Head work.

Might make for an intresting thread.

ride hard!!

mark.

  • KJ790

Posted February 17, 2008 - 11:04 AM

#2

All of those things work great together, but that probably isn't an option money wise. First I would say get an exhaust. Next I would say cams. Cams really shine wih an exhaust that breathes right. High compression pistons are nice for more low end, but don't go too high or you can end up losing power everywhere. Head work is nice, but a bit pricey for the benefits IMO. If you have the money, then head work will help. Ignitions are also very expensive, but can make a difference depending on the bike. Another thing that has great bang for the buck is oxygenated fuel.

  • bnyfe

Posted February 17, 2008 - 02:06 PM

#3

Whats the best hop up you can do for the 08 450f - apart from the obvious exhaust!!!

whats peoples ideas on,
A- cams
B- ignitions
C- high comp pistons
D- Head work.

Might make for an intresting thread.

ride hard!!

mark.


Hi Mark...I am not trying to be a wise guy. As far as the bike goes a pipe will do the job. Additionally, there is no substitute for gearing. Gearing is probably the single most overlooked "hop up" or modification. You should always try re-gearing before wasting money on cams pistons etc. All that being said, there really is no hop-up like "seat-time" and practice! This is the single greatest guarantee to make your bike faster by tomorrow!

  • markryam

Posted February 18, 2008 - 12:35 PM

#4

Hi Mark...I am not trying to be a wise guy. As far as the bike goes a pipe will do the job. Additionally, there is no substitute for gearing. Gearing is probably the single most overlooked "hop up" or modification. You should always try re-gearing before wasting money on cams pistons etc. All that being said, there really is no hop-up like "seat-time" and practice! This is the single greatest guarantee to make your bike faster by tomorrow!


no probs - been racing long enough to know this. but you are right. we have tried playing with the gearing, and ended up back at stock!!

what were lookin for is more grunt off the start, and more torque in the deep sand.

i have the white brothers slip on, the stock header with the"bomb" seems to work good.

im thinking of a cam on the intake side. dont know whether to go for a crower , a hot cam or a high comp piston.

im really open to suggestions.

  • dirtysouth

Posted February 18, 2008 - 12:42 PM

#5

no probs - been racing long enough to know this. but you are right. we have tried playing with the gearing, and ended up back at stock!!

what were lookin for is more grunt off the start, and more torque in the deep sand.

i have the white brothers slip on, the stock header with the"bomb" seems to work good.

im thinking of a cam on the intake side. dont know whether to go for a crower , a hot cam or a high comp piston.

im really open to suggestions.



Have heard about a lot of bad news coming through relative to the Hot Cam. Dunno how true it is but valve to piston clearance has been an issue with a few guys. Have heard good and bad but the bad is significant enough that I would do some serious digging first if I were considering the Hot Cam. I might lean to high comp piston for torque along with a little headwork.

  • Ga426owner

Posted February 18, 2008 - 02:30 PM

#6

Whats the best hop up you can do for the 08 450f - apart from the obvious exhaust!!!

whats peoples ideas on,
A- cams
B- ignitions
C- high comp pistons
D- Head work.

Might make for an intresting thread.

ride hard!!

mark.


DRD and RHC can help you spend $$$ on this. I recommend them both for matching correct components. DRD just had a nice write up in MXA for his 450 and what works

  • markryam

Posted February 18, 2008 - 02:33 PM

#7

Have heard about a lot of bad news coming through relative to the Hot Cam. Dunno how true it is but valve to piston clearance has been an issue with a few guys. Have heard good and bad but the bad is significant enough that I would do some serious digging first if I were considering the Hot Cam. I might lean to high comp piston for torque along with a little headwork.



i e-mailed hot cams and it seems thet dont do a cam for the 08 yet, so this is prob why there are issues.

im gonna go for a high comp piston and a crower cam i guess, in both the 450f and just a cam in the 250f

this mated with a vortex ign should give me some good power. on the 450 i have a white brothers slip on, and the 250f a full cairolli leo vince system.

hopefully i will get them down to the dyno when the parts are fitted and post some runs up.

  • stroker101

Posted February 18, 2008 - 03:59 PM

#8

i would throw "suspension work" into that list. it may not be a "engine" mod/hop-up but would be one of the first things many would do...next to an aftermarket exhuast

  • bnyfe

Posted February 19, 2008 - 05:37 AM

#9

no probs - been racing long enough to know this. but you are right. we have tried playing with the gearing, and ended up back at stock!!

what were lookin for is more grunt off the start, and more torque in the deep sand.

i have the white brothers slip on, the stock header with the"bomb" seems to work good.

im thinking of a cam on the intake side. dont know whether to go for a crower , a hot cam or a high comp piston.

im really open to suggestions.


I ride in deep sand too...so if you find a mod that works good for that please let me know. Although, I personally have no experience with hot cams, my friends who have tried them indicated to me that they are not that good.

  • intensem1rider

Posted February 19, 2008 - 08:49 AM

#10

Heavier flywheel and the torque webcams should get you where you want.

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  • TahitianRed

Posted February 21, 2008 - 02:57 PM

#11

I didn't want to start another thread about a similar subject, so I will ask here about hop-ups for someone who is not a horsepower freak (not that that's a bad thing :smirk: ). My plan would be to follow the recent suggestions in MXA and add a heavier flywheel:

1. Change front tire model
2. Change rear tire width
3. Enzo tuned suspension
4. DR.D radiator lowering kit
5. DR.D exhaust system (only because it is needed for the rad lowering kit)
6. GYTR 9oz flywheel

Is there anything I'm missing for a dependable, good handling MX bike?

  • grayracer513

Posted February 21, 2008 - 03:20 PM

#12

Bars to fit you, and the standard "dump the rear chain before it destroys everything it touches" warning.

  • Windseeker

Posted February 21, 2008 - 03:31 PM

#13

the rad lowering kit - how really important mod is it?

  • TahitianRed

Posted February 21, 2008 - 03:43 PM

#14

Windseeker,

I don't think it is absolutely needed, but along with other small things like dropping the fork tubes a little and keeping the rear axle back, it can help a bike that gives up some turning precision to the CRF, RMZ and KXF gain a little in the corners, for very little money spent.

:smirk:

Gray,

I'm working on the bar thing now. I have a few sets of Renthal Twinwalls waiting for testing down at the local dealer.

  • Hot Rods

Posted February 22, 2008 - 07:32 AM

#15

Have heard about a lot of bad news coming through relative to the Hot Cam. Dunno how true it is but valve to piston clearance has been an issue with a few guys. Have heard good and bad but the bad is significant enough that I would do some serious digging first if I were considering the Hot Cam. I might lean to high comp piston for torque along with a little headwork.


The Hot Cams are designed to be safe with stock components. High compression pistons shouldnt be an issue either. There isnt any valve to piston issues with the cam, unless of course, there is an installation issue with the timing. Clearance should be checked with any compression change, but the valve reliefs in high comp pistons should be as safe as the stock piston.

  • Hot Rods

Posted February 22, 2008 - 07:37 AM

#16

i e-mailed hot cams and it seems thet dont do a cam for the 08 yet, so this is prob why there are issues.

im gonna go for a high comp piston and a crower cam i guess, in both the 450f and just a cam in the 250f

this mated with a vortex ign should give me some good power. on the 450 i have a white brothers slip on, and the 250f a full cairolli leo vince system.

hopefully i will get them down to the dyno when the parts are fitted and post some runs up.


The 08 Yz cams are in the works. The earlier ones dont do much for the 08, so a new set is coming, but there arent any clearance issues.

  • psmith85

Posted February 23, 2008 - 09:15 PM

#17

I had very noticable gains by changing the main jet. I experimented and went up 1 size at a time and looked for performance gains and losses. I am currently at 4 sizes larger and the only reason that I stopped here is that is the largest size I had. BTW, I did all this with the stock pipe. I recently put on a DrD pipe and noticed that the pipe cleaned up some 1/8 to 1/4 jetting issues. I plan on getting a few size larger main jets to continue my experiment esp now that i have the pipe.

  • Windseeker

Posted March 08, 2008 - 05:08 PM

#18

Bars to fit you, and the standard "dump the rear chain before it destroys everything it touches" warning.


Just returning to this issue again.
Are there main simple rules to the HB setup - or is it just the "feel"?

"Bars to fit" - is is shoulder width thing? rise or smth else? Stock bars are rather wide for me (if i put my hands on it with my eyes closed) and cause I m installing Scotts sub mount the HB will go up 4-5 cm (I usually bought the highest possible bars for woods riding).

  • yzaddict106

Posted March 08, 2008 - 07:24 PM

#19

Here is what my bike has:
1 bigger on the main jet
carb mod (wiring the accel. pump)
Two Brothers exhaust system (go to your local dealer and ask to see these in the Tucker Rocky books, and read the gains....7.1 Hp at 5600RPMs and 15% more at 32-5200)
JM Racing Suspension
Engine Ice (def. throw some in there. the cooler the bike runs, the more efficient it will be)
Tamer Holeshot Device
Push Button Bleeder Valves for the forks
Ozz Mod numbers
Custom Humble Kawasaki graphics (I bought the bike then got a job at a Kawasaki Dealership. Oops!)

On the way:
Dunlop 756 Front and rear
ScaryFast Power Now Wing for the carb
ScaryFast Accel. Pump cover.
Moose Radiator Gaurds
gas cap


What may happen after:
Rims/hubs
sprockets
misc. bling
decal works Numbers
Big Gun rev limiter
gas tank foam
radiator lowering kit
high comp piston
cams

  • rickallen124

Posted March 08, 2008 - 10:16 PM

#20

check out www.webcamshafts.com They have a torque cam that Dr.D is using and I believe Grant Langston ran during the nationals last year. So if you're looking for more torque that might be the ticket.





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